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Anabolic steroid



 
 
Anabolic steroids, or anabolic-androgenic steroids (AAS), are a class of steroid hormone
Steroid hormone

Steroid hormones are steroids that act as hormones. Steroid hormones can be grouped into five groups by the receptor s to which they bind: glucocorticoids, mineralocorticoids, androgens, estrogens, and progestagens....
s related to the hormone testosterone
Testosterone

Testosterone is a steroid hormone from the androgen group. In mammals, testosterone is primarily secreted in the testis of males and the ovaries of females, although small amounts are also secreted by the adrenal glands....
. They increase protein synthesis
Protein biosynthesis

Protein synthesis is the process in which cell build proteins. The term is sometimes used to refer only to protein translation but more often it refers to a multi-step process, beginning with amino acid synthesis and transcription which are then used for translation ....
 within cells, which results in the buildup of cellular
Cell (biology)

The cell is the structural and functional unit of all known Life organisms. It is the smallest unit of an organism that is classified as living, and is often called the building bricks of life....
 tissue (anabolism
Anabolism

Anabolism is the set of metabolic pathways that construct molecules from smaller units. These reactions require energy. One way of categorizing metabolic processes, whether at the cell ular, organ or organism level is as 'anabolic' or as 'catabolism', which is the opposite....
), especially in muscle
MUSCLE

MUSCLE is public domain, multiple sequence alignment software for protein and nucleotide sequences.MUSCLE is integrated into UGENE bioinformatics tool as a plugin....
s. Anabolic steroids also have androgen
Androgen

Androgen is the generic term for any natural or synthetic compound, usually a steroid hormone, that stimulates or controls the development and maintenance of masculine characteristics in vertebrates by binding to androgen receptors....
ic and virilizing
Virilization

In biology and medicine, virilization refers to the biological development of sex differences, changes which make a male body different from a female body....
 properties, including the development and maintenance of masculine
Masculinity

Masculinity is manly character. It specifically describes men and boys , that is personal and human, unlike male which can also be used to describe animals, or masculine which can also be used to describe noun classes....
 characteristics such as the growth of the vocal cords and body hair. The word anabolic comes from the Greek anabolein, "to build up", and the word androgenic from the Greek andros, "man" + genein, "to produce".

Anabolic steroids were first isolated, identified and synthesized
Chemical synthesis

In chemistry, chemical synthesis is purposeful execution of chemical reactions in order to get a product , or several products. This happens by physics and chemical manipulations usually involving one or more reactions....
 in the 1930s, and are now used therapeutically in medicine to stimulate bone growth and appetite, induce male puberty
Puberty

Puberty refers to the process of physical changes by which a child's body becomes an adult body capable of reproduction. Puberty is initiated by hormone signals from the brain to the gonads ....
, and treat chronic wasting
Wasting

In medical circles, wasting refers to the process by which a debilitating disease causes muscle and fat biological tissue to "waste" away. Wasting is sometimes referred to as "acute malnutrition" because it is believed that episodes of wasting have a short duration, in contrast to stunted growth, which is regarded as chronic malnutrition....
 conditions, such as cancer
Cancer

Cancer is a class of diseases in which a group of cell display uncontrolled growth , invasion , and sometimes metastasis . These three malignant properties of cancers differentiate them from benign tumors, which are self-limited, do not invade or metastasize....
 and AIDS
AIDS

Acquired immune deficiency syndrome or acquired immunodeficiency syndrome is a disease of the human immune system caused by the HIV ....
.






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Encyclopedia


Anabolic steroids, or anabolic-androgenic steroids (AAS), are a class of steroid hormone
Steroid hormone

Steroid hormones are steroids that act as hormones. Steroid hormones can be grouped into five groups by the receptor s to which they bind: glucocorticoids, mineralocorticoids, androgens, estrogens, and progestagens....
s related to the hormone testosterone
Testosterone

Testosterone is a steroid hormone from the androgen group. In mammals, testosterone is primarily secreted in the testis of males and the ovaries of females, although small amounts are also secreted by the adrenal glands....
. They increase protein synthesis
Protein biosynthesis

Protein synthesis is the process in which cell build proteins. The term is sometimes used to refer only to protein translation but more often it refers to a multi-step process, beginning with amino acid synthesis and transcription which are then used for translation ....
 within cells, which results in the buildup of cellular
Cell (biology)

The cell is the structural and functional unit of all known Life organisms. It is the smallest unit of an organism that is classified as living, and is often called the building bricks of life....
 tissue (anabolism
Anabolism

Anabolism is the set of metabolic pathways that construct molecules from smaller units. These reactions require energy. One way of categorizing metabolic processes, whether at the cell ular, organ or organism level is as 'anabolic' or as 'catabolism', which is the opposite....
), especially in muscle
MUSCLE

MUSCLE is public domain, multiple sequence alignment software for protein and nucleotide sequences.MUSCLE is integrated into UGENE bioinformatics tool as a plugin....
s. Anabolic steroids also have androgen
Androgen

Androgen is the generic term for any natural or synthetic compound, usually a steroid hormone, that stimulates or controls the development and maintenance of masculine characteristics in vertebrates by binding to androgen receptors....
ic and virilizing
Virilization

In biology and medicine, virilization refers to the biological development of sex differences, changes which make a male body different from a female body....
 properties, including the development and maintenance of masculine
Masculinity

Masculinity is manly character. It specifically describes men and boys , that is personal and human, unlike male which can also be used to describe animals, or masculine which can also be used to describe noun classes....
 characteristics such as the growth of the vocal cords and body hair. The word anabolic comes from the Greek anabolein, "to build up", and the word androgenic from the Greek andros, "man" + genein, "to produce".

Anabolic steroids were first isolated, identified and synthesized
Chemical synthesis

In chemistry, chemical synthesis is purposeful execution of chemical reactions in order to get a product , or several products. This happens by physics and chemical manipulations usually involving one or more reactions....
 in the 1930s, and are now used therapeutically in medicine to stimulate bone growth and appetite, induce male puberty
Puberty

Puberty refers to the process of physical changes by which a child's body becomes an adult body capable of reproduction. Puberty is initiated by hormone signals from the brain to the gonads ....
, and treat chronic wasting
Wasting

In medical circles, wasting refers to the process by which a debilitating disease causes muscle and fat biological tissue to "waste" away. Wasting is sometimes referred to as "acute malnutrition" because it is believed that episodes of wasting have a short duration, in contrast to stunted growth, which is regarded as chronic malnutrition....
 conditions, such as cancer
Cancer

Cancer is a class of diseases in which a group of cell display uncontrolled growth , invasion , and sometimes metastasis . These three malignant properties of cancers differentiate them from benign tumors, which are self-limited, do not invade or metastasize....
 and AIDS
AIDS

Acquired immune deficiency syndrome or acquired immunodeficiency syndrome is a disease of the human immune system caused by the HIV ....
. The American College of Sports Medicine
American College of Sports Medicine

OverviewThe American College of Sports Medicine is the largest sports medicine and exercise science organization in the world. More than 20,000 international, national and regional members are dedicated to advancing and integrating scientific research to provide educational and practical applications of exercise science and sports medicine....
 acknowledges that AAS, in the presence of adequate diet, can contribute to increases in body weight, often as lean mass increases, and that the gains in muscular strength achieved through high-intensity exercise and proper diet can be additionally increased by the use of AAS in some individuals.

Serious health risks can be produced by long-term use or excessive doses of anabolic steroids. These effects include harmful changes in cholesterol
Cholesterol

Cholesterol is a lipidic, waxy alcohol found in the cell membranes and transported in the blood plasma of all animals. It is an essential component of mammalian cell membranes where it is required to establish proper membrane permeability and membrane fluidity....
 levels (increased low-density lipoprotein and decreased high-density lipoprotein), acne
Acne vulgaris

Acne vulgaris is a skin condition caused by changes in the pilosebaceous units . Severe acne is inflammation, but acne can also manifest in noninflammatory forms....
, high blood pressure, liver damage
Hepatotoxicity

Hepatotoxicity implies chemical-driven liver damage. The liver plays a central role in transforming and clearing chemicals and is susceptible to the toxicity from these agents....
, and dangerous changes in the structure of the left ventricle
Left ventricle

The left ventricle is one of four heart chamber in the human heart. It receives oxygenated blood from the left atrium via the mitral valve, and pumps it into the aorta via the aortic valve....
 of the heart.

Ergogenic uses for anabolic steroids in sports and bodybuilding
Bodybuilding

Bodybuilding is the process of maximizing muscle hypertrophy; an individual who engages in this activity is referred to as a bodybuilder. In competitive bodybuilding, bodybuilders display their physiques to a panel of judges, who assign points based on their aesthetic appearance....
 is controversial, because of their adverse effects and the potential to gain an advantage conventionally considered "unfair." Their use is considered doping and banned by all major sporting bodies. For many years the AAS have been by far the most detected doping substances in IOC-accredited laboratories. In countries where AAS are controlled substances, there is often a black market in which smuggled or even counterfeit drugs are sold to users. In those countries some have called for less regulation because of those health risk and corresponding civil rights issues.

History


Isolation of gonadal AAS


The use of gonadal steroid
Steroid

A steroid is a terpenoid lipid characterized by a carbon skeleton with four fused rings, generally arranged in a 6-6-6-5 fashion.Steroids vary by the functional groups attached to these rings and the oxidation state of the rings....
s pre-dates their identification and isolation. Medical use of testicle
Testicle

The testicle is the male gonad in animals. This article will concentrate on mammalian testicles unless otherwise noted.The etymology of the word is somewhat colorfully based on Roman law....
 extract began in the late 19th century while its effects on strength were still being studied. The isolation of gonadal steroids can be traced back to 1931 when Adolf Butenandt
Adolf Butenandt

Adolf Friedrich Johann Butenandt was a Germany biochemist. He was awarded the Nobel Prize in Chemistry in 1939 for his "work on sex hormones." He was initially forced by the Nazi government to decline the award, but accepted it in 1949 after World War II....
, a chemist in Marburg
Marburg

Marburg is a city in Hesse, Germany, on the River Lahn. It is the main town of the Marburg-Biedenkopf district. Its population is 78,701, and its geographical position is ....
, purified 15 milligrams of the male hormone androstenone
Androstenone

Androstenone is a steroid found in both male and female sweat and urine. It is also found in boar's saliva, and in celery cytoplasm. Androstenone was the first mammalian pheromone to be identified....
 from tens of thousands of litres of urine. This steroid was subsequently synthesized
Chemical synthesis

In chemistry, chemical synthesis is purposeful execution of chemical reactions in order to get a product , or several products. This happens by physics and chemical manipulations usually involving one or more reactions....
 in 1934 by Leopold Ruzicka, a chemist in Zurich.

In the 1930s it was already known that the testes contained a more powerful androgen
Androgen

Androgen is the generic term for any natural or synthetic compound, usually a steroid hormone, that stimulates or controls the development and maintenance of masculine characteristics in vertebrates by binding to androgen receptors....
 than androstenone, and three groups of scientists, funded by competing pharmaceutical companies in the Netherlands, Nazi Germany and Switzerland, raced to isolate it. This hormone was first identified by Karoly Gyula David, E. Dingemanse, J. Freud and Ernst Laqueur in a May 1935 paper "On Crystalline Male Hormone from Testicles (Testosterone)." They named the hormone testosterone
Testosterone

Testosterone is a steroid hormone from the androgen group. In mammals, testosterone is primarily secreted in the testis of males and the ovaries of females, although small amounts are also secreted by the adrenal glands....
, from the stems of testicle and sterol
Sterol

Sterols are an important class of organic molecules. They occur naturally in plants, animals and fungi, with the most familiar type of animal sterol being cholesterol, which has been shown to contribute to high blood pressure and heart disease....
, and the suffix of ketone
Ketone

In organic chemistry, a ketone is a type of organic compound which contains a carbonyl group bonded to two other carbon atoms in the form:Neither of the substituents R1 and R2 may be equal to hydrogen ....
. The chemical synthesis
Chemical synthesis

In chemistry, chemical synthesis is purposeful execution of chemical reactions in order to get a product , or several products. This happens by physics and chemical manipulations usually involving one or more reactions....
 of testosterone was achieved in August that year, when Butenandt and G. Hanisch published a paper describing "A Method for Preparing Testosterone from Cholesterol." Only a week later, the third group, Ruzicka and A. Wettstein, announced a patent application in a paper "On the Artificial Preparation of the Testicular Hormone Testosterone (Androsten-3-one-17-ol)." Ruzicka and Butenandt were offered the 1939 Nobel Prize for Chemistry for their work, but the Nazi
Nazi Germany

Nazi Germany and the Third Reich are the colloquial English names for Germany under the regime of Adolf Hitler and the Nazi Party , which established a Totalitarianism dictatorship that existed from 1933 to 1945....
 government forced Butenandt to decline the honor, although he accepted the prize after the end of World War II.

Clinical trials on humans, involving either oral doses of methyltestosterone
Methyltestosterone

Methyltestosterone is a 17-alpha-alkylated anabolic steroid used to treat men with a testosterone deficiency. It is also used in women to treat breast cancer, breast pain, swelling due to pregnancy, and with the addition of estrogen it can treat symptoms of menopause....
 or injections of testosterone propionate, began as early as 1937. Testosterone propionate is mentioned in a letter to the editor of Strength and Health magazine in 1938; this is the earliest known reference to an anabolic steroid in a U.S. weightlifting
Weightlifting

Weightlifting, also called Weightlifting at the Summer Olympics or Olympic-style weightlifting, is a sport in which participants attempt a maximum weight single lift of a barbell loaded with weight plates....
 or bodybuilding
Bodybuilding

Bodybuilding is the process of maximizing muscle hypertrophy; an individual who engages in this activity is referred to as a bodybuilder. In competitive bodybuilding, bodybuilders display their physiques to a panel of judges, who assign points based on their aesthetic appearance....
 magazine. There are often reported rumors that German soldiers were administered anabolic steroids during the Second World War, the aim being to increase their aggression and stamina, but these are, as yet, unproven. Adolf Hitler
Adolf Hitler

Adolf Hitler was an Austrian-born Germany politician and the leader of the National Socialist German Workers Party , popularly known as the Nazi Party....
 himself, according to his physician, was injected with testosterone derivatives to treat various ailments. AAS were used in experiments conducted by the Nazis on concentration camp inmates, and later by the allies attempting to treat the malnourished victims that survived Nazi camps.

Development of synthetic AAS

Metandienone
The development of muscle-building properties of testosterone was pursued in the 1940s, in the Soviet Union and in Eastern Bloc
Eastern bloc

During the Cold War, the terms Eastern Bloc, Communist Bloc or Soviet Bloc were used to refer to European annexed or expanded Soviet Socialist Republics of the USSR and Satellite state states, including members of the Soviet-dominated organizations Comecon and the Warsaw Pact....
 countries such as East Germany, where steroid programs were used to enhance the performance of Olympic
Olympic Games

The Olympic Games are an international multi-sport event established for both summer and winter sports. There have been two generations of the Olympic Games; the first were the Ancient Olympic Games held at Olympia, Greece, Greece....
 and other amateur
Amateur sports

Amateurism . As a value system, amateurism elevates things done with self-interest above those done for pay . The term has particular currency in its usage with regard to sports....
 weight lifters
Weightlifting

Weightlifting, also called Weightlifting at the Summer Olympics or Olympic-style weightlifting, is a sport in which participants attempt a maximum weight single lift of a barbell loaded with weight plates....
. In response to the success of Russian weightlifters, the U.S. Olympic Team physician Dr. John Ziegler
John Bosley Ziegler

John Bosley Ziegler, John Ziegler, Montana Jack, was an American physician who originally developed the anabolic steroid Methandrostenolone which was released in the USA in 1958 by Ciba Specialty Chemicals....
 worked with synthetic chemists to develop an anabolic steroid with reduced androgenic
Anabolic steroid

Anabolic steroids, or anabolic-androgenic steroids , are a class of steroid hormones related to the hormone testosterone. They increase Protein biosynthesis within cells, which results in the buildup of Cell tissue , especially in muscles....
 effects. Ziegler's work resulted in the production of methandrostenolone
Methandrostenolone

Methandrostenolone is an anabolic steroid originally developed by John Bosley Ziegler and released in the United States in the early 1960's by Ciba Specialty Chemicals....
, which Ciba Pharmaceuticals marketed as Dianabol. The new steroid was approved for use in the U.S. by the Food and Drug Administration
Food and Drug Administration

The U.S. Food and Drug Administration is an Government agency of the United States Department of Health and Human Services and is responsible for regulating and supervising the safety of foods, dietary supplements, Medications, vaccines, Biopharmaceutical, blood transfusion, medical devices, Electromagnetic radiation-emitting devices, veteri...
 (FDA) in 1958. It was most commonly administered to burn victims and the elderly. The drug's off-label users were mostly bodybuilders and weight lifters. Although Ziegler prescribed only small doses to athletes, he soon discovered that those who abused Dianabol suffered from enlarged prostates and atrophied testes. AAS were placed on the list of banned substances of the IOC in 1976, and a decade later the committee introduced 'out-of-competition' doping tests because many athletes used AAS in their training period rather than during competition.

Three major ideas governed modifications of testosterone into a multitude of AAS: alkylation
Alkylation

Alkylation is the transfer of an alkyl group from one molecule to another. The alkyl group may be transferred as an alkyl carbocation, a free radical, a carbanion or a carbene ....
 at 17-alpha position with methyl or ethyl
Ethyl

Ethyl may refer to:* Ethyl group, a functional group in organic chemistry* Ethyl Corporation, a fuel additive company* Ethanol, also known as ethyl alcohol...
 group created orally active compounds because it slows the degradation of the drug by the liver, esterification
Esterification

Esterification is the general name for a chemical reaction in which two reactants form an ester as the product . Esters are common in organic chemistry and biological materials, and often have a characteristic pleasant, fruity odor....
 of testosterone and nortestosterone at the 17-beta position allows the substance to be administered parenterally and increases the duration of effectiveness because agents soluble in oily liquids may be present in the body for several months, and finally alterations of the ring structure were applied for both oral and parenteral agents to seeking to obtain different anabolic to androgenic effect ratios.

Pharmacology


Routes of administration

There are three common forms in which anabolic steroids are administered: oral pills, injectable steroids, and skin patches. Oral administration is the most convenient. Testosterone administered by mouth is rapidly absorbed, but it is largely converted to inactive metabolites, and only about 1/6 is available in active form. In order to be sufficiently active when given by mouth, testosterone derivatives are alkylated at the 17 position, e.g. methyltestosterone
Methyltestosterone

Methyltestosterone is a 17-alpha-alkylated anabolic steroid used to treat men with a testosterone deficiency. It is also used in women to treat breast cancer, breast pain, swelling due to pregnancy, and with the addition of estrogen it can treat symptoms of menopause....
 and fluoxymesterne. This modification reduces the liver's ability to break down these compounds before they reaches the systemic circulation.

Testosterone can be administered parenterally
Route of administration

In pharmacology and toxicology, a route of administration is the path by which a medication, fluid, poison or other substance is brought into contact with the body....
, but it has more prolonged absorption time and greater activity in propionate
Propionate

The propionate ion is Carbon2Hydrogen5COxygenO− .A propionate or propanoate compound is a salt or ester of propionic acid....
, enanthate, undecanoate or cypionate ester
Ester

An ester is an often Aroma compound organic chemistry or partially organic compound formed by the reaction between an acid and an alcohol or aromatic alcohol with the elimination of water....
 form. These derivatives are hydrolyzed to release free testosterone at the site of injection. Injectable steroids are typically administered into the muscle, not into the vein, to avoid sudden changes in the amount of the drug in the bloodstream. Transdermal patch
Transdermal patch

A transdermal patch or skin patch is a medicated adhesive patch that is placed on the skin to deliver a specific dose of medication through the skin and into the bloodstream....
es (adhesive patches placed on the skin) may also be used to deliver a steady dose through the skin and into the bloodstream. Injection is the most common method used by individuals administering anabolic steroids for non-medical purposes.

The traditional routes of administration do not have differential effects on the efficacy of the drug. Studies indicate that the anabolic properties of anabolic steroids are relatively similar despite the differences in pharmacokinetic principles such as first-pass metabolism. However, the orally available forms of AAS may cause liver damage
Hepatotoxicity

Hepatotoxicity implies chemical-driven liver damage. The liver plays a central role in transforming and clearing chemicals and is susceptible to the toxicity from these agents....
 in high doses.

Anabolic and androgenic effects


|- |}

As the name suggests, anabolic-androgenic steroids have two different, but overlapping, types of effects: anabolic, meaning that they promote anabolism
Anabolism

Anabolism is the set of metabolic pathways that construct molecules from smaller units. These reactions require energy. One way of categorizing metabolic processes, whether at the cell ular, organ or organism level is as 'anabolic' or as 'catabolism', which is the opposite....
 (cell growth), and androgen
Androgen

Androgen is the generic term for any natural or synthetic compound, usually a steroid hormone, that stimulates or controls the development and maintenance of masculine characteristics in vertebrates by binding to androgen receptors....
ic
(or virilizing
Virilization

In biology and medicine, virilization refers to the biological development of sex differences, changes which make a male body different from a female body....
), meaning that they affect the development and maintenance of masculine characteristics.

Some examples of the anabolic effects of these hormones are increased protein synthesis
Protein biosynthesis

Protein synthesis is the process in which cell build proteins. The term is sometimes used to refer only to protein translation but more often it refers to a multi-step process, beginning with amino acid synthesis and transcription which are then used for translation ....
 from amino acid
Amino acid

In chemistry, an amino acid is a molecule containing both amine and carboxyl functional groups. These molecules are particularly important in biochemistry, where this term refers to alpha-amino acids with the general formula H2NCHRCOOH, where R is an organic substituent....
s, increased appetite, increased bone remodeling and growth, and stimulation of bone marrow
Bone marrow

Bone marrow is the flexible biological tissue found in the hollow interior of bones. In adults, marrow in large bones produces new blood cells....
, which increases the production of red blood cell
Red blood cell

Red blood cells are the most common type of blood cell and the vertebrate body's principal means of delivering oxygen to the body tissues via the blood....
s. Through a number of mechanisms
Anabolic steroid

Anabolic steroids, or anabolic-androgenic steroids , are a class of steroid hormones related to the hormone testosterone. They increase Protein biosynthesis within cells, which results in the buildup of Cell tissue , especially in muscles....
 anabolic steroids stimulate the formation of muscles cells and hence cause an increase in the size of skeletal muscles leading to increased strength.

The androgenic effects of AAS are numerous. Processes affected include pubertal growth, sebaceous gland
Sebaceous gland

Sebaceous glands are small glands in the skin which secrete an oily matter in the hair follicles to lubricate the skin and hair of animals. In humans, they are found in greatest abundance on the face and scalp, though they are distributed throughout all skin sites except the palms and soles....
 oil production, and sexuality (especially in fetal development). Some examples of virilizing effects are growth of the clitoris in females and the penis
Penis

The penis is an external sex organ of certain biologically male organisms, in both vertebrates and invertebrates.The penis is a reproductive organ, technically an intromittent organ, and for Eutheria, additionally serves as the external organ of urination....
 in male children (the adult penis does not grow even when exposed to high doses of androgens), increased growth of androgen-sensitive hair (pubic
Pubic hair

Although fine Vellus is present in the area in childhood, the term pubic hair is generally restricted to the heavier, longer and coarser hair that develops with puberty as an effect of rising levels of androgens....
, beard, chest, and limb hair), increased vocal cord size, deepening the voice, increased libido
Libido

Libido in its common usage means sexual desire; however, more technical definitions, such as those found in the work of Carl Jung, are more general, referring to libido as the free creative?or psychic?energy an individual has to put toward personal development or individuation....
, suppression of natural
Endogenous

The word endogenous means "arising from within", the opposite of exogenous....
 sex hormones, and impaired production of sperm
Spermatogenesis

Spermatogenesis is the process by which male spermatogonia develop into mature spermatozoa. Spermatozoa are the mature male gametes in many sexually reproducing organisms....
.

The androgenic:anabolic ratio of an AAS is an important factor when determining the clinical application of these compounds. Compounds with a high ratio of androgenic to a anabolic effects are the drug of choice in androgen-replacement therapy (e.g. treating hypogonadism
Hypogonadism

Hypogonadism is a medical term for a defect of the reproductive system that results in lack of function of the gonads . The gonads have two functions: to produce hormones , activin and to produce gametes ....
 in males), whereas compounds with a reduced androgenic:anabolic ratio are preferred for anemia, osteoporosis, and to reverse protein loss following trauma, surgery or prolonged immobilization. Determination of androgenic:anabolic ratio is typically performed in animal studies, which has led to the marketing of some compounds claimed to have anabolic activity with weak androgenic effects. This disassociation is less marked in humans, where all anabolic steroids have significant androgenic effects.

A commonly used protocol for determining the androgenic:anabolic ratio, dating back to the 1950s, uses the relative weights of ventral prostate
Prostate

The prostate is a compound tubuloalveolar exocrine gland of the male mammalian reproductive system. Females do not have a prostate gland, although females do have tiny paraurethral Skene's glands connected to the distal third of the urethra in the prevaginal space that are homologous to the prostate....
 (VP) and levator ani
Levator ani

The Levator ani is a broad, thin muscle, situated on the side of the pelvis.It is attached to the inner surface of the side of the lesser pelvis, and unites with its fellow of the opposite side to form the greater part of the floor of the pelvic cavity....
 muscle (LA) of male rat
Laboratory rat

A laboratory rat is a rat of the species Rattus norvegicus which is bred and kept for scientific research. Laboratory rats have served as an important animal model for research in psychology, medicine, and other fields....
s. The VP weight is an indicator of the androgenic effect, while the LA weight is an indicator of the anabolic effect. Two or more batches of rats are castrated and given no treatment and respectively some AAS of interest. The LA/VP ratio for an AAS is calculated as the ratio of LA/VP weight gains produced by the treatment with that compound using castrated but untreated rats as baseline: (LAc,t–LAc)/(VPc,t–VPc). The LA/VP weight gain ratio from rat experiments is not unitary for testosterone (typically 0.3–0.4), but it's normalized for presentation purposes, and used as basis of comparison for other AAS, which have their androgenic:anabolic ratios scaled accordingly (as shown in the table above). In the early 2000s this procedure was standardized and generalized throughout OECD in what is now known as the Hershberger assay.

Body composition and strength improvements

A review spanning more than three decades of experimental studies in men found that body weight may increase by 2–5 kg as a result of short term (<10 weeks) AAS use, which may be attributed mainly to an increase of lean mass. Animal studies also found that fat mass was reduced, but most studies in humans failed to elucidate significant fat mass decrements. The effects on lean body mass have been shown to be dose dependent. Both muscle hypertrophy
Muscle hypertrophy

Muscle hypertrophy is a scientific term for the growth and increase of the size of muscle cells. It differs from hyperplasia, which is the formation of new muscle cells....
 and the formation of new muscle fibers have been observed. The hydration of lean mass remains unaffected by AAS use, although small increments of blood volume cannot be ruled out.

The upper region of the body (thorax, neck, shoulders and upper arm) seems to be more susceptible for AAS than other body regions because of predominance of androgen receptors in the upper body. The largest difference in muscle fibre size between AAS users and non-users was observed in type I muscle fibres of the vastus lateralis and the trapezius muscle
Trapezius muscle

In human anatomy, the trapezius is a large superficial muscle which extends longitudinally from the occipital bone to the lower thoracic vertebrae, and laterally to the spine of the scapula ....
 as a result of long-term AAS self-administration. After drug withdrawal the effects fade away slowly, but may persist for more than 6–12 weeks after cessation of AAS use.

The same review observed strength improvements in the range of 5-20% of baseline strength, largely depending on the drugs and dose used as well as the administration period. Overall, the exercise where the most significant improvements were observed was the bench press
Bench press

The bench press is a strength training exercise in which, while lying on his back, the person performing the bench press lowers a weight to the level of the chest, then pushes it back up until the arm is straight and the elbows locked ....
. For almost two decades it was assumed that AAS only exerted significant effects in experienced strength athletes, particularly based on the studies of Hervey and coworkers. In 1996 a randomized controlled trial published in the New England Journal of Medicine
New England Journal of Medicine

The New England Journal of Medicine is an English language peer-reviewed medical journal published by the Massachusetts Medical Society. It is one of the most popular and widely-read peer-reviewed general medical journals in the world....
 demonstrated however that even in novice athletes a 10-week strength training program accompanied by testosterone enanthate at 600 mg/week may improve strength more than training alone does. The same study found that dose was sufficient to significantly improve lean muscle mass relative to placebo even in subjects that did not exercise at all. A 2001 study by the same first author, showed that the anabolic effects of testosterone enanthate were highly dose dependent.

Adverse effects

Anabolic steroids can cause many adverse effects. Most of these side effects are dose-dependent, the most common being elevated blood pressure
Blood pressure

Blood pressure is the pressure exerted by circulating blood on the walls of blood vessels, and constitutes one of the principal vital signs. The pressure of the circulating blood decreases as it moves away from the heart through artery and capillary, and toward the heart through veins....
, especially in those with pre-existing hypertension
Hypertension

Hypertension, also referred to as high blood pressure, HTN or HPN, is a medical condition in which the blood pressure is chronically elevated....
, and harmful changes in cholesterol
Cholesterol

Cholesterol is a lipidic, waxy alcohol found in the cell membranes and transported in the blood plasma of all animals. It is an essential component of mammalian cell membranes where it is required to establish proper membrane permeability and membrane fluidity....
 levels: some steroids cause an increase in LDL cholesterol
Low density lipoprotein

Low-density lipoprotein is a type of lipoprotein that transports cholesterol and triglycerides from the liver to peripheral tissues. LDL is one of the five major groups of lipoproteins; these groups include chylomicrons, very low-density lipoprotein , intermediate-density lipoprotein , low-density lipoprotein, and high-density lipoprotein ,...
 and a decrease in HDL cholesterol
High density lipoprotein

High-density lipoproteins is one of the 5 major groups of lipoproteins which enable lipids like cholesterol and triglycerides to be transported within the water based blood stream....
. Anabolic steroids have been shown to alter fasting blood sugar and glucose tolerance tests. Anabolic steroids such as testosterone also increase the risk of cardiovascular disease
Cardiovascular disease

Cardiovascular disease or cardiovascular diseases refers to the class of diseases that involve the heart or blood vessels . While the term technically refers to any disease that affects the Circulatory system , it is usually used to refer to those related to atherosclerosis ....
 or coronary artery disease. Acne
Acne

Acne is a group of skin rashes that have different causes.* Acne vulgaris - most commonly experienced around puberty, typically of the face and shoulders/chest...
 is fairly common among anabolic steroid users, mostly due to stimulation of the sebaceous gland
Sebaceous gland

Sebaceous glands are small glands in the skin which secrete an oily matter in the hair follicles to lubricate the skin and hair of animals. In humans, they are found in greatest abundance on the face and scalp, though they are distributed throughout all skin sites except the palms and soles....
s by increased testosterone levels. Conversion of testosterone to dihydrotestosterone
Dihydrotestosterone

Dihydrotestosterone While DHT is best known for its roles in causing male pattern hair loss and prostate problems, it is crucial to virilization and is necessary to mitigate estrogen's effects in men....
 (DHT) can accelerate the rate of premature baldness
Baldness

Baldness involves the state of lacking hair where it often grows, especially on the head. The most common form of baldness is a progressive hair thinning condition called androgenic alopecia or "male pattern baldness" that occurs in adult male humans and other species....
 for males who are genetically predisposed, but testosterone itself can produce baldness in females.

High doses of oral anabolic steroid compounds can cause liver damage
Hepatotoxicity

Hepatotoxicity implies chemical-driven liver damage. The liver plays a central role in transforming and clearing chemicals and is susceptible to the toxicity from these agents....
 as the steroids are metabolized (17a-alkyl
Alkyl

An alkyl is a univalent Radical consisting of carbon and hydrogen atoms, arranged in a chain. The Alkyls form homologous series with the general formula CnH2n+1....
ated) in the digestive system to increase their bioavailability
Bioavailability

In pharmacology, bioavailability is used to describe the fraction of an administered dose of unchanged drug that reaches the systemic circulation, one of the principal pharmacokinetics properties of medication....
 and stability. When high doses of such steroids are used for long periods, serious damage to the liver may occur.

There are also sex-specific side effects of anabolic steroids. Development of breast tissue in males, a condition called gynecomastia
Gynecomastia

Gynecomastia, or gynaecomastia, is the development of abnormally large mammary glands in males resulting in breast enlargement, which can sometimes cause secretion of milk....
 (which is usually caused by high levels of circulating estrogen
Estrogen

Estrogens are a group of steroid compounds, named for their importance in the estrous cycle, and functioning as the primary female sex hormone....
), may arise because of increased conversion of testosterone to estrogen by the enzyme aromatase
Aromatase

Aromatase is an enzyme of the cytochrome P450 superfamily , whose function is to aromatize androgens , producing estrogens. As such, it is an important factor in sexual development....
. Reduced sexual function
Sexual function

A model defining different aspects of sexual function relevant for the assessment of sexual dysfunction developed at the Karolinska Institute in Stockholm, Sweden, comprises the following components : First, relevant aspects of sexual function are defined on the basis of a modified version of Masters and Johnson?s pioneer work.The aspects of sexual...
 and temporary infertility
Infertility

Infertility primarily refers to the biological inability of a person to contribute to fertilization. Infertility may also refer to the state of a woman who is unable to carry a pregnancy to full term....
 can also occur in males. Another male-specific side effect which can occur is testicular atrophy
Testicular atrophy

Testicular atrophy is a medical condition in which the male reproductive organ s diminish in size and may be accompanied by loss of function. This does not refer to temporary changes, such as those brought on by cold....
, caused by the suppression of natural testosterone levels, which inhibits production of sperm
Spermatogenesis

Spermatogenesis is the process by which male spermatogonia develop into mature spermatozoa. Spermatozoa are the mature male gametes in many sexually reproducing organisms....
 (most of the mass of the testes is developing sperm). This side effect is temporary: the size of the testicles usually returns to normal within a few weeks of discontinuing anabolic steroid use as normal production of sperm resumes. Female-specific side effects include increases in body hair
Hirsutism

Hirsutism or Frazonism or is defined as excessive and increased hair growth in women in locations where the occurrence of terminal hair normally is minimal or absent....
, deepening of the voice, enlarged clitoris, and temporary decreases in menstrual cycle
Menstrual cycle

The menstrual cycle is a recurring cycle of physiology changes that occurs in reproductive-age females. Overt menstruation occurs primarily in humans and close evolutionary relatives such as chimpanzees....
s. When taken during pregnancy, anabolic steroids can affect fetal development
Fetal development

Prenatal development is the process in which an embryo#The human embryo or fetus#Human fetus gestation during pregnancy, from human fertilisation until birth....
 by causing the development of male features in the female fetus and female features in the male fetus.

A number of severe side effects can occur if adolescents use anabolic steroids. For example, the steroids may prematurely stop the lengthening of bones (premature epiphyseal fusion
Epiphyseal plate

The epiphyseal plate is a hyaline cartilage plate in the metaphysis at each end of a long bone. The plate is found in children and adolescents; in adults, who have stopped growing, the plate is replaced by an epiphyseal line....
 through increased levels of estrogen metabolite
Metabolite

Metabolites are the intermediates and products of metabolism. The term metabolite is usually restricted to small molecules. A primary metabolite is directly involved in normal growth, development, and reproduction....
s), resulting in stunted growth
Stunted growth

Stunted growth is a reduced growth rate in human development. It is a primary manifestation of malnutrition in early childhood, including malnutrition during fetal development brought on by the malnourished mother....
. Other effects include, but are not limited to, accelerated bone maturation
Bone age

Bone age is a way of describing the degree of maturation of a child's bones. As a person grows from Fetus life through childhood, puberty, and finishes growth as a young adult, the bones of the skeleton change in size and shape....
, increased frequency and duration of erections, and premature sexual development. Anabolic steroid use in adolescence is also correlated with poorer attitudes related to health.

Other side effects can include alterations in the structure of the heart
Heart

The heart is a muscle organ in all vertebrates responsible for pumping blood through the blood vessels by repeated, rhythmic contractions, or a similar structure in annelids, mollusks, and arthropods....
, such as enlargement and thickening of the left ventricle
Left ventricular hypertrophy

Left ventricular hypertrophy is the thickening of the myocardium of the left ventricle of the heart....
, which impairs its contraction and relaxation. Possible effects of these alterations in the heart are hypertension, cardiac arrhythmia
Cardiac arrhythmia

Cardiac arrhythmia is a term for any of a large and heterogeneous group of conditions in which there is abnormal Electrical conduction system of the heart in the heart....
s, congestive heart failure
Congestive heart failure

Heart failure is a condition in which a problem with the structure or function of the heart impairs its ability to supply sufficient blood flow to meet the body's needs....
, heart attacks
Myocardial infarction

Myocardial infarction , commonly known as a heart attack, occurs when the Blood flow to part of the heart is interrupted. This is most commonly due to occlusion of a coronary artery following the rupture of a Vulnerable plaque, which is an unstable collection of lipids and white blood cells in the wall of an artery....
, and sudden cardiac death
Sudden Cardiac Death

The term sudden cardiac death refers to natural death from cardiac causes, heralded by abrupt loss of consciousness within one hour of the onset of acute symptoms....
. These changes are also seen in non-drug using athletes, but steroid use may accelerate this process. However, both the connection between changes in the structure of the left ventricle and decreased cardiac function, as well as the connection to steroid use have been disputed.

Psychiatric effects
A 2005 review in CNS Drugs determined that "significant psychiatric symptoms including aggression and violence, mania
Mania

Mania is a severe medical condition characterized by extremely elevated mood, energy, unusual thought patterns and sometimes psychosis. There are several possible causes for mania including drug abuse and brain tumours, but it is most often associated with bipolar disorder, where episodes of mania may cyclically alternate with episodes of ma...
, and less frequently psychosis
Psychosis

Psychosis , with adjective psychotic, literally means abnormal condition of the mind, and is a generic psychiatry term for a mental state often described as involving a "loss of contact with reality"....
 and suicide have been associated with steroid abuse
Drug abuse

Drug abuse has a huge range of definitions related to taking a psychoactive drug or performance enhancing drug for a non-therapeutic or non-medical effect....
. Long-term steroid abusers may develop symptoms of dependence and withdrawal
Withdrawal

Withdrawal, also known as withdrawal/abstinence syndrome, refers to the characteristic signs and symptoms that appear when a drug that causes physical dependence is regularly used for a long time and then suddenly discontinued or decreased in dosage....
 on discontinuation of AAS". High concentrations of AAS, comparable to those likely sustained by many recreational AAS users, produce apoptotic effects on neuron
Neuron

Neurons are responsive cell in the nervous system that process and transmit information by electrochemical Signal . They are the core components of the brain, the vertebrate spinal cord, the invertebrate ventral nerve cord, and the peripheral nerves....
s, raising the specter of possibly irreversible neuropsychiatric toxicity. Recreational AAS use appears to be associated with a range of potentially prolonged psychiatric effects, including dependence syndromes, mood disorder
Mood disorder

A mood disorder is the term given for a group of diagnoses in the Diagnostic and Statistical Manual of Mental Disorders classification system where a disturbance in the person's Mood is hypothesised to be the main underlying feature....
s, and progression to other forms of substance abuse, but the prevalence and severity of these various effects remains poorly understood. There is no evidence that steroid dependence develops from therapeutic use of anabolic steroids to treat medical disorders, but instances of AAS dependence have been reported among weightlifters and bodybuilders who chronically administered supraphysiologic doses. Mood disturbances (e.g. depression, [hypo-]mania, psychotic features) are likely to be dose- and drug-dependent, but AAS dependence or withdrawal effects seem to occur only in a small number of AAS users.

Large scale long term studies of psychiatric effects on AAS users are generally not available. In 2003, the first naturalistic long term study on ten users, seven of which completed the study, found a high incidence of mood disorders and substance abuse, but few clinically relevant changes in physiological parameters or laboratory measures were noted throughout the study, and these changes were not clearly related to periods of reported AAS use. A 13-month study, published in 2006 and which involved 320 body builders and athletes suggests that the wide range of psychiatric side effects induced by the use of AAS is correlated to the severity of abuse.

Aggression and hypomania
From the mid-1980s onwards the popular press has been reporting "roid rage" as a side effect of AAS. A 2005 review determined that some, but not all, randomized controlled studies have found that anabolic steroid use correlates with hypomania and increased aggressiveness, but pointed out that attempts to determine whether AAS use triggers violent behaviour have failed, primarily because of high rates of non-participation. A 2008 study on a nationally representative sample of young adult males in the United States found an association between lifetime and past-year self-reported anabolic-androgenic steroid use and involvement in violent acts. Compared with individuals who did not use steroids, young adult males who used anabolic-androgenic steroids reported greater involvement in violent behaviors even after controlling for the effects of key demographic variables, previous violent behavior, and polydrug use. A 1996 review examining the blind studies available at that time also found that these had demonstrated a link between aggression and steroid use, but pointed out that with estimates of over one million past or current steroid users in the United States at that time, an extremely small percentage of those using steroids appear to have experienced mental disturbance severe enough to result in clinical treatments or medical case reports.

A 1996 randomized controlled trial
Randomized controlled trial

A randomized controlled trial is a type of scientific experiment most commonly used in testing the efficacy or effectiveness of healthcare Service or health technologies ....
, which involved 43 men, did not find an increase in the occurrence of angry behavior during 10 weeks of administration of testosterone enanthate at 600 mg/week, but this study screened out subjects that had previously abused steroids or had any psychiatric antecedents. A trial conducted in 2000 using testosterone cypionate at 600 mg/week found that treatment significantly increased manic
Manic

Manic is a List of Belgrade neighborhoods of Belgrade, the capital of Serbia. It is located in the municipality of Barajevo.Manic developed on the eastern slopes of the Kosmaj mountain....
 scores on the YMRS, and aggressive responses on several scales. The drug response was highly variable, however: 84% of subjects exhibited minimal psychiatric effects, 12% became mildly hypomanic, and 4% (2 subjects) became markedly hypomanic. The mechanism of these variable reactions could not be explained by demographic, psychological, laboratory, or physiological measures.

A 2006 study of two pairs of identical twins, in which one twin used anabolic steroids and the other did not, found that in both cases the steroid-using twin exhibited high levels of aggressiveness, hostility, anxiety and paranoid ideation not found in the "control" twin. A small scale study of 10 AAS users found that cluster B personality disorders were confounding factors for aggression.

Depression and suicide
The relationship between AAS use and depression is inconclusive. There have been anecdotal reports of depression and suicide in teenage steroid users, but little systematic evidence. A 1992 review found that anabolic-androgenic steroids may both relieve and cause depression, and that cessation or diminished use of anabolic-androgenic steroids may also result in depression, but called for additional studies due to disparate data.

Addiction potential
In an animal study male rats developed a conditioned place preference
Conditioned place preference

Conditioned place preference is a technique commonly used in animal studies to evaluate preferences for environmental stimuli that have been associated with a positive or negative reward....
 to testosterone injections into the nucleus accumbens
Nucleus accumbens

The nucleus accumbens , also known as the accumbens nucleus or as the nucleus accumbens septi , is a collection of neurons within the forebrain....
, an effect blocked by dopamine antagonist
Dopamine antagonist

A dopamine antagonist is a drug which blocks dopamine receptors by receptor antagonism. There are five types of dopamine receptors in the human body; they are found in the brain, peripheral nervous system, blood vessels, and the kidney)....
s, which suggests that androgen reinforcement is mediated by the brain. Moreover, testosterone appears to act through the mesolimbic dopamine system, a common substrate for drugs of abuse. Nonetheless, androgen reinforcement is not comparable to that of cocaine or heroin. Instead, testosterone resembles other mild reinforcers, such as caffeine, nicotine, or benzodiazepines. The potential for androgen addiction remains to be determined.

Mechanism of action


The main way in which steroid hormones interact with cells is by binding to proteins called steroid receptors. When steroids bind to these receptors, the proteins move into the cell nucleus
Cell nucleus

In cell biology, the nucleus , also sometimes referred to as the "control center", is a membrane-enclosed organelle found in all eukaryote cell ....
 and either alter the expression
Gene expression

Gene expression is the process by which inheritable information from a gene, such as the DNA sequence, is made into a functional gene product, such as protein or RNA....
 of gene
Gene

A gene is the basic unit of heredity in a living organism. All living things depend on genes. Genes hold the information to build and maintain their cell and pass genetic trait to offspring....
s or activate processes that send signals
Signal transduction

In biology, 'signal transduction' refers to any process by which a cell converts one kind of signal or stimulus into another. Most processes of signal transduction involve ordered sequences of biochemistry chemical reaction inside the cell, which are carried out by enzymes, activated by Second messenger systems, resulting in a signal tran...
 to other parts of the cell. In the case of anabolic steroids, the receptors involved are called the androgen receptor
Androgen receptor

The androgen receptor , also known as NR3C4 , is a type of nuclear receptor which is activated by binding of either of the androgen hormones testosterone or dihydrotestosterone....
s. The mechanisms of action differ depending on the specific anabolic steroid. Different types of anabolic steroids bind to the androgen receptor with different affinities
Dissociation constant

In chemistry and biochemistry, a dissociation constant is a specific type of equilibrium constant that measures the propensity of a larger object to separate reversibly into smaller components, as...
, depending on their chemical structure. Some anabolic steroids such as methandrostenolone
Methandrostenolone

Methandrostenolone is an anabolic steroid originally developed by John Bosley Ziegler and released in the United States in the early 1960's by Ciba Specialty Chemicals....
 bind weakly to this receptor in vitro, but still exhibit androgenic effects in vivo. The reason for this discrepancy is not known. On the other hand, steroids such as oxandrolone
Oxandrolone

Oxandrolone is an anabolic steroid created by Searle Laboratories, now Pfizer under the trademark Anavar, and introduced into the US in 1964....
 bind tightly to the receptor and act mostly on gene expression
Gene expression

Gene expression is the process by which inheritable information from a gene, such as the DNA sequence, is made into a functional gene product, such as protein or RNA....
.

The effect of anabolic steroids on muscle mass is caused in at least two ways: first, they increase the production of proteins
Protein biosynthesis

Protein synthesis is the process in which cell build proteins. The term is sometimes used to refer only to protein translation but more often it refers to a multi-step process, beginning with amino acid synthesis and transcription which are then used for translation ....
; second, they reduce recovery time by blocking the effects of stress hormone cortisol
Cortisol

Cortisol is a corticosteroid hormone or glucocorticoid produced by the adrenal cortex, that is part of the adrenal gland . It is usually referred to as the "stress hormone" as it is involved in response to stress and anxiety, controlled by Corticotropin-releasing hormone....
 on muscle tissue, so that catabolism
Catabolism

Catabolism is the set of metabolic pathways which break down molecules into smaller units and release energy. In catabolism, large molecules such as polysaccharides, lipids, nucleic acids and proteins are broken down into smaller units such as monosaccharides, fatty acids, nucleotides and amino acids, respectively....
 of muscle is greatly reduced. It has been hypothesized that this reduction in muscle breakdown may occur through anabolic steroids inhibiting the action of other steroid hormones called glucocorticoid
Glucocorticoid

Glucocorticoids are a class of steroid hormones which bind to the glucocorticoid receptor , which is present in almost every animal cell.GCs are part of the feedback mechanism in the immune system which turns immune activity down....
s that promote the breakdown of muscles. Anabolic steroids also affect the number of cells that develop into fat-storage cells, by favouring cellular differentiation
Cellular differentiation

In developmental biology, cellular differentiation is the process by which a less specialized cell becomes a more specialized cell type. Differentiation occurs numerous times during the development of a multicellular organism as the organism changes from a single zygote to a complex system of Tissue and cell types....
 into muscle cells instead. Anabolic steroids can also decrease fat by the an increase in basal metabolic rate, as an increase in muscle size, increases BMR.

Pharmacodynamics

The pharmacodynamics
Pharmacodynamics

Pharmacodynamics is the study of the biochemical and physiological effects of drugs on the body or on microorganisms or parasites within or on the body and the mechanisms of drug action and the relationship between drug concentration and effect....
 of anabolic steroids are unlike peptide
Peptide

Peptides are short polymers formed from the linking, in a defined order, of a-amino acids. The link between one amino acid residue and the next is known as an amide chemical bond or a peptide bond....
 hormones. Peptide hormones cannot penetrate the cell membranes and only indirectly affect the nucleus
Atomic nucleus

The nucleus of an atom is the very dense region, consisting of nucleons , at the center of an atom. Although the size of the nucleus varies considerably according to the mass of the atom, the size of the entire atom is comparatively constant....
 of target cells
Cell (biology)

The cell is the structural and functional unit of all known Life organisms. It is the smallest unit of an organism that is classified as living, and is often called the building bricks of life....
 through their interaction with the cell’s surface receptors. Conversely, as steroid hormones, anabolic steroids are membrane permeable and influence the nucleus of cells by direct action. The pharmacodynamic action of anabolic steroids begin when the exogenous hormone penetrates the permeable membrane of the target cell and binds to an androgen receptor
Androgen receptor

The androgen receptor , also known as NR3C4 , is a type of nuclear receptor which is activated by binding of either of the androgen hormones testosterone or dihydrotestosterone....
 located in the cytoplasm
Cytoplasm

The cytoplasm is the part of a Cell that is enclosed within the plasma membrane. In eukaryote cells the cytoplasm contains organelles, such as mitochondrion, that are filled with liquid kept separate from the rest of the cytoplasm by biological membranes....
 of that cell. From there, the entire receptor-complex moves from the cytoplasm into the nucleus by a process called translocation
Chromosomal translocation

In genetics, a chromosome translocation is a chromosome abnormality caused by rearrangement of parts between nonhomologous chromosomes. A fusion gene may be created when the translocation joins two otherwise separated genes, an event which is common in cancer....
. Once in the nucleus, the receptor-complex interacts with the DNA
DNA

Deoxyribonucleic acid is a nucleic acid that contains the genetics instructions used in the development and functioning of all known living organisms and some viruses....
 by recoding the genetic information to produce more myonuclei, this is known as transcription
Transcription (genetics)

Transcription is the synthesis of RNA under the direction of DNA. RNA synthesis, or transcription, is the process of transcribing DNA nucleotide sequence information into RNA sequence information....
. After the restructuring of DNA, mRNA sends the new message back into the cytoplasm where specific organelles, such as ribosomes, make new protein
Protein

Proteins are organic compounds made of amino acids arranged in a linear chain and joined together by peptide bonds between the carboxyl and amino groups of adjacent amino acid Residue ....
.

Medical and ergogenic uses


Medical uses

Since the discovery and synthesis of testosterone in the 1930s, anabolic steroids have been used by physicians for many purposes, with varying degrees of success.
  • Bone marrow
    Bone marrow

    Bone marrow is the flexible biological tissue found in the hollow interior of bones. In adults, marrow in large bones produces new blood cells....
     stimulation: For decades, anabolic steroids were the mainstay of therapy for hypoplastic anemia
    Anemia

    Anemia or an?mia/anaemia is defined as a qualitative or quantitative deficiency of hemoglobin, a protein found inside red blood cells ....
    s due to leukemia
    Leukemia

    Leukemia is a cancer of the blood or bone marrow and is characterized by an abnormal proliferation of blood Cell , usually white blood cells ....
     or kidney failure, especially aplastic anemia
    Aplastic anemia

    Aplastic anemia is a condition where bone marrow does not produce sufficient new cell s to replenish blood cells.The term 'aplastic' means the marrow suffers from an aplasia that renders it unable to function properly....
    . Anabolic steroids have largely been replaced in this setting by synthetic protein hormones (such as epoetin alfa
    Epoetin alfa

    Epoetin alfa is a synthetic form of erythropoietin. It stimulates erythropoiesis and is used to treat anemia, commonly associated with chronic renal failure and cancer chemotherapy....
    ) that selectively stimulate growth of blood cell precursors.
  • Growth
    Human development (biology)

    Human development is the process of growing to maturity. In biological terms, this entails growth from a one-celled zygote to an adult human being....
     stimulation: Anabolic steroids can be used by pediatric endocrinologists
    Pediatric endocrinology

    Pediatric endocrinology is a medical subspecialty dealing with variations of physical growth and sexual development in childhood, as well as diabetes and other disorders of the endocrine glands....
     to treat children with growth failure
    Growth failure

    Growth failure is a medical term for a pattern of a child's growth which is poorer than normal for age, sex, stage of maturation, and genetic height expectation....
    . However, the availability of synthetic growth hormone
    Growth hormone treatment

    Growth hormone is a protein hormone secreted by the pituitary gland which stimulates Cell growth and cell reproduction. In the past growth hormone was extracted from human pituitary glands....
    , which has fewer side effects, makes this a secondary treatment.
  • Stimulation of appetite
    Appetite

    The appetite is the desire to eating food, felt as hunger. Appetite exists in all higher lifeforms, and serves to regulate adequate energy intake to maintain metabolism needs....
     and preservation and increase of muscle
    MUSCLE

    MUSCLE is public domain, multiple sequence alignment software for protein and nucleotide sequences.MUSCLE is integrated into UGENE bioinformatics tool as a plugin....
     mass: Anabolic steroids have been given to people with chronic wasting conditions
    Cachexia

    Cachexia is weight loss, muscle atrophy, fatigue, weakness and significant anorexia in someone who is not actively trying to lose weight. It can be a sign of various underlying disorders; when a patient presents with cachexia, a doctor will generally consider the possibility of cancer, metabolic acidosis , certain infectious diseases , and...
     such as cancer
    Cancer

    Cancer is a class of diseases in which a group of cell display uncontrolled growth , invasion , and sometimes metastasis . These three malignant properties of cancers differentiate them from benign tumors, which are self-limited, do not invade or metastasize....
     and AIDS
    AIDS

    Acquired immune deficiency syndrome or acquired immunodeficiency syndrome is a disease of the human immune system caused by the HIV ....
    .
  • Induction of male puberty
    Puberty

    Puberty refers to the process of physical changes by which a child's body becomes an adult body capable of reproduction. Puberty is initiated by hormone signals from the brain to the gonads ....
    : Androgens are given to many boys distressed about extreme delay of puberty
    Delayed puberty

    Puberty is described as delayed puberty when a boy or girl has passed the usual age of onset of puberty with no physical or hormone signs that it is beginning....
    . Testosterone is now nearly the only androgen used for this purpose and has been shown to increase height, weight, and fat-free mass in boys with delayed puberty.
  • Testosterone enanthate has frequently been used as a male contraceptive
    Male contraceptive

    The only forms of contraceptives currently available to men are condoms, the coitus interruptus, and vasectomy. Other forms of male contraception are in various stages of research and development....
     and it is thought that in the near future it could be used as a safe, reliable, and reversible male contraceptive.
  • Anabolic steroids have been found in some studies to increase lean body mass and prevent bone loss
    Bone resorption

    Bone resorption is the process by which osteoclasts break down bone and release the minerals, resulting in a transfer of calcium from bone fluid to the blood....
     in elderly men. However, a 2006 placebo-controlled trial of low-dose testosterone supplementation in elderly men with low levels of testosterone found no benefit on body composition, physical performance, insulin sensitivity, or quality of life
    Quality of life

    Quality of life is the degree of well-being felt by an individual or group of people.Quality of life cannot be measured directly, however the perception of QOL is made up of of two components: the physical and the psychological....
    .
  • Used in hormone replacement therapy
    Hormone replacement therapy

    Hormone replacement therapy may refer to:*Hormone replacement therapy *Hormone replacement therapy *Hormone replacement therapy *Androgen replacement therapy ...
     for men with low levels of testosterone
    Hypogonadism

    Hypogonadism is a medical term for a defect of the reproductive system that results in lack of function of the gonads . The gonads have two functions: to produce hormones , activin and to produce gametes ....
     and is also effective in improving libido for elderly males.
  • Used to treat gender dysmorphia (the belief that one was born the wrong gender) by producing secondary male characteristics, such as a deeper voice, increased bone and muscle mass, facial hair, increased levels of red blood cells and clitoral
    Clitoris

    The clitoris is a sex organ that is present only in female mammals. In humans, the visible button-like portion is located near the anterior junction of the labia minora, above the opening of the urethra and vagina....
     enlargement in female-to-male
    Transman

    A transman or transguy is short for transsexual or transgender man - a person who was naturally born or physically assigned as female at birth, but who feels that this is not an accurate or complete description of themselves and consequently gender identity as a male....
     patients.


Ergogenic use and abuse

It is difficult to determine what percent of the population in general have actually used anabolic steroids, but the number seems to be fairly low. Studies in the United States have shown anabolic steroid users tend to be mostly middle-class heterosexual men with a median
Median

In probability theory and statistics, a median is described as the number separating the higher half of a sample, a population, or a probability distribution, from the lower half....
 age of about 25 who are noncompetitive bodybuilders and non-athletes and use the drugs for cosmetic purposes. Another study found that non-medical use of AAS among college students was at or less than 1%. According to a recent survey, 78.4% of steroid users were noncompetitive bodybuilders and non-athletes while about 13% reported unsafe injection practices such as reusing needles, sharing needles, and sharing multidose vials, though a 2007 study found that sharing of needles was extremely uncommon among individuals using anabolic steroids for non-medical purposes, less than 1%. Another 2007 study found that 74% of non-medical anabolic steroid users had secondary college degrees and more had completed college and less had failed to complete high school than is expected from the general populace. The same study found that individuals using anabolic steroids for non-medical purposes had a higher employment rate and a higher household income than the general population. Anabolic steroid users tend to research the drugs they are taking more than other controlled-substance users; however, the major sources consulted by steroid users include friends, non-medical handbooks, and fitness magazines, which can provide questionable or inaccurate information.

Anabolic steroid users tend to be disillusioned by the portrayal of anabolic steroids as deadly in the media and in politics. According to one study, AAS users also distrust their physicians and in the sample 56% had not disclosed their AAS use to their physicians. Another 2007 study had similar findings, showing that while 66% of individuals using anabolic steroids for non-medical purposes were willing to seek medical supervision for their steroid use, 58% lacked trust in their physicians, 92% felt that the medical community's knowledge of non-medical anabolic steroid use was lacking and 99% felt that the public has an exaggerated view of the side effects of anabolic steroid use. A recent study has also shown that long term AAS users were more likely to have symptoms of muscle dysmorphia
Muscle dysmorphia

Muscle dysmorphia is a disease in which a person becomes obsessed with the idea that he or she is not muscular enough. Those who suffer from muscle dysmorphia tend to hold delusions that they are "skinny" or "too small" but are often above average in musculature....
 and also showed stronger endorsement of more conventional male roles.

Anabolic steroids have been used by men and women in many different kinds of professional sports (cricket
Cricket

Cricket is a Bat-and-ball games team sport that originated in southern England. The earliest definite reference is dated 1598, and it is now played in more than 100 countries....
, track and field, weightlifting
Weightlifting

Weightlifting, also called Weightlifting at the Summer Olympics or Olympic-style weightlifting, is a sport in which participants attempt a maximum weight single lift of a barbell loaded with weight plates....
, bodybuilding
Bodybuilding

Bodybuilding is the process of maximizing muscle hypertrophy; an individual who engages in this activity is referred to as a bodybuilder. In competitive bodybuilding, bodybuilders display their physiques to a panel of judges, who assign points based on their aesthetic appearance....
, shot put
Shot put

The shot put is an athletics event involving "putting" a heavy metal ball as far as possible. It is common to use the term "shot put" to refer to both the shot itself and to the throwing motion....
, cycling
Cycling

Cycling is the use of bicycles, or - less commonly - unicycles, tricycles, Quadracycle s and other similar wheeled human powered vehicles as a means of transport, a form of recreation or a sport....
, baseball
Baseball

Baseball is a bat-and-ball sport played between two team sport of nine players each. The goal of baseball is to score run by hitting a thrown Baseball with a baseball bat and touching a series of four markers called base arranged at the corners of a ninety-foot square, or diamond. Players on one team take turns hitting against...
, wrestling
Wrestling

Wrestling is part of the martial arts. A wrestling match consists of physical engagement between two people in which each wrestler strives to get an advantage over, or control of, the opponent....
, mixed martial arts
Mixed martial arts

Mixed martial arts is a Contact sport combat sport that allows a wide variety of fighting techniques, from a mixture of martial arts traditions and non-traditions, to be used in competitions....
, boxing
Boxing

Boxing is a combat sport where two participants, generally of similar human weight, fight each other with their fists. Boxing is supervised by a referee and is typically engaged in during a series of one to three-minute intervals called rounds....
, football
Football

File:Football4.pngFootball is the word given to a number of similar team sports, all of which involve kicking a ball with the foot in an attempt to score a Goal ....
, etc.) to attain a competitive edge or to assist in recovery from injury. Such use is prohibited by the rules of the governing bodies of many sports. Anabolic steroid use occurs among adolescents, especially by those participating in competitive sports. It has been suggested that the prevalence of use among high-school students in the U.S. may be as high as 2.7%. Male students used anabolic steroids more frequently than female students and, on average, those who participated in sports used steroids more often than those who did not.

Legal and sport restrictions

The use of anabolic steroids is banned by all major sporting bodies, including the International Olympic Committee
International Olympic Committee

The International Olympic Committee is an organization based in Lausanne, Switzerland, created by Pierre de Coubertin and Demetrios Vikelas on June 23, 1894....
, Major League Baseball
Major League Baseball

Major League Baseball is the highest level of play in American professional baseball. Specifically, Major League Baseball refers to the organization that operates the National League and the American League, by means of a joint organizational structure that has developed gradually between them since 1903 ....
, the National Football League
National Football League

The National Football League is the Major North American professional sports leagues American football Sports league in the United States. It is an unincorporated 501#501.28c.29.286.29 association controlled by its members....
, the National Basketball Association
National Basketball Association

The National Basketball Association is North America's premier professional men's basketball league, composed of thirty teams: twenty-nine in the United States and one in Canada....
, the National Hockey League
National Hockey League

The National Hockey League is a professional ice hockey league composed of 30 teams in North America. It is considered to be the premier professional ice hockey league in the world, and one of the North American Major professional sports leagues of the United States and Canada....
, WWE, ICC
International Cricket Council

The International Cricket Council is the international Sport governing body of cricket. It was founded as the Imperial Cricket Conference in 1909 by representatives from England, Australia and South Africa, renamed the International Cricket Conference in 1965, and took up its current name in 1989....
, ITF
International Tennis Federation

The International Tennis Federation is the governing body of world tennis, made up of 205 national tennis associations.It was established as the International Lawn Tennis Federation by 12 national associations meeting at a conference in Paris, France on 1 March 1913....
, FIFA
FIFA

The F?d?ration Internationale de Football Association , commonly known by its acronym, FIFA , is the international sport governing body of association football....
, FINA
Fina

Fina may refer to:*Fina, a software system for financial analysis*Skies_of_Arcadia#Main_player_characters, a character in the Skies of Arcadia video game...
, UEFA
UEFA

The Union of European Football Associations is the administrative and controlling body for European association football. It is almost always referred to by its acronym UEFA ....
, the European Athletic Association
European Athletic Association

The European Athletic Association is the European governing body for the sport of Athletics ....
, and the Brazilian Football Confederation
Brazilian Football Confederation

The Brazilian Football Confederation or Confedera??o Brasileira de Futebol in Portuguese language is the governing body of football in Brazil, and was founded on August 20, 1914 as Confedera??o Brasileira de Desportos , meaning Brazilian Sports Confederation....
. Anabolic steroids are controlled substances in many countries, including Argentina, Australia, Brazil, Canada, the Netherlands (NL), the United Kingdom (UK) and the United States (U.S.), while in other countries, such as Mexico and Thailand, they are readily available over-the-counter
Over-the-counter drug

Over-the-counter drugs are medications that may be sold to a customer without a medical prescription. The term "over-the-counter" is somewhat counter-intuitive, since these items can often be found on the shelves of stores and bought like any other packaged product in some countries in contrast to prescription drug which are more likely to l...
.

Legal status

The legal status of anabolic steroids varies from country to country: some have stricter controls on their use or prescription than others though in many countries they are not illegal. In the U.S., anabolic steroids are currently listed as Schedule III controlled substances under the Controlled Substances Act
Controlled Substances Act

The Controlled Substances Act was enacted into law by the Congress of the United States as Title II of the Comprehensive Drug Abuse Prevention and Control Act of 1970....
, which makes the first offense simple possession of such substances without a prescription a federal crime punishable by up to one year in prison, and the unlawful distribution or possession with intent to distribute anabolic steroids punishable as a first offense by up to five years in prison (to be increased to ten years, effective on or about April 13, 2009). In Canada, anabolic steroids and their derivatives are part of the Controlled drugs and substances act and are Schedule IV substances, meaning that it is illegal to obtain or sell them without a prescription; however, possession is not punishable, a consequence reserved for schedule I, II or III substances. Those guilty of buying or selling anabolic steroids in Canada can be imprisoned for up to 18 months. Import and export also carry similar penalties. Anabolic steroids are also illegal without prescription in Australia, Argentina, Brazil and Portugal, and are listed as Schedule 4 Controlled Drugs in the United Kingdom. On the other hand, anabolic steroids are readily available without a prescription in some countries such as Mexico and Thailand.

United States
The history of the U.S. legislation on anabolic steroids goes back to the late 1980s, when the U.S. Congress considered placing anabolic steroids under the Controlled Substances Act following the controversy over Ben Johnson's victory at the 1988 Summer Olympics
1988 Summer Olympics

The 1988 Summer Olympics, officially known as the Games of the XXIV Olympiad, were an international multi-sport event celebrated in 1988 in Seoul, South Korea....
 in Seoul
Seoul

Seoul is the Capital and largest city of South Korea. With a population of over 10 million, It is one of the world's List of cities proper by population.The Seoul National Capital Area - which includes the major port city of Incheon and satellite towns in Gyeonggi-do, has 24.5 million inhabitants and is the world's second largest List of me...
. During deliberations, the American Medical Association
American Medical Association

The American Medical Association , founded in 1847 and incorporated 1897, is the largest association of physicians and medical students in the United States....
 (AMA), Drug Enforcement Administration
Drug Enforcement Administration

The Drug Enforcement Administration is a United States Department of Justice law enforcement agency tasked with combating War on Drugs Not only is the DEA the lead agency for domestic enforcement of the drug policy of the United States , it also has sole responsibility for coordinating and pursuing U.S....
(DEA), Food and Drug Administration
Food and Drug Administration

The U.S. Food and Drug Administration is an Government agency of the United States Department of Health and Human Services and is responsible for regulating and supervising the safety of foods, dietary supplements, Medications, vaccines, Biopharmaceutical, blood transfusion, medical devices, Electromagnetic radiation-emitting devices, veteri...
 (FDA) as well as the National Institute on Drug Abuse
National Institute on Drug Abuse

The National Institute on Drug Abuse is a United States federal-government research institute whose mission is to "lead the Nation in bringing the power of science to bear on drug abuse and addiction."...
 (NIDA) all opposed listing anabolic steroids as controlled substances, citing the fact that use of these hormones does not lead to the physical or psychological dependence required for such scheduling under the Controlled Substance Act. Nevertheless, anabolic steroids were added to Schedule III of the Controlled Substances Act in the Anabolic Steroid Control Act of 1990. The same act also introduced more stringent controls with higher criminal penalties for offenses involving the illegal distribution of anabolic steroids and human growth hormone. By the early 1990s, after anabolic steroids were scheduled in the U.S., several pharmaceutical companies stopped manufacturing or marketing the products in the U.S., including Ciba, Searle, Syntex and others. In the Controlled Substances Act, anabolic steroids are defined to be any drug or hormonal substance chemically and pharmacologically related to testosterone (other than estrogen
Estrogen

Estrogens are a group of steroid compounds, named for their importance in the estrous cycle, and functioning as the primary female sex hormone....
s, progestin
Progestin

A progestin is a Chemical synthesis progestagen that has progestinic effects similar to progesterone. The two most frequent uses of progestins are for hormonal contraception , and to prevent endometrial hyperplasia from unopposed estrogen in hormone replacement therapy....
s, and corticosteroid
Corticosteroid

Corticosteroids are a class of steroid hormones that are produced in the adrenal cortex. Corticosteroids are involved in a wide range of physiology systems such as stress , immune system and regulation of inflammation, carbohydrate metabolism, protein catabolism, blood electrolyte levels, and behavior....
s) that promote muscle growth. The act was amended by the Anabolic Steroid Control Act of 2004, which added prohormone
Prohormone

A prohormone is a substance that is a precursor to a hormone, usually having minimal hormonal effect by itself. The term has been used in medical science since the middle of the 20th century....
s to the list of controlled substances, with effect from January 20, 2005.

Movement for decriminalization
After the Anabolic Steroid Control Act of 1990 listed anabolic steroids as Schedule III controlled substances in the U.S., a small movement has arisen that is highly critical of current laws concerning anabolic steroids. On June 21, 2005, Real Sports aired a segment discussing the legality and prohibition of anabolic steroids in America. The show featured Gary I. Wadler, M.D., chairman of the U.S. Anti-Doping Agency and a prominent anti-steroid activist. When pressed for scientific evidence by correspondent Armen Keteyian
Armen Keteyian

Armen Keteyian is an United States television journalist and author. He is currently CBS News' Chief Investigative journalist; he also files reports for HBO's Real Sports with Bryant Gumbel....
 that anabolic steroids are as "highly fatal" as is often claimed, Wadler admitted there was no evidence. Bryant Gumbel concluded the "hoopla" concerning the dangers of anabolic steroids in the media was "all smoke and no fire". The show also featured John Romano, a pro-steroid activist who writes "The Romano Factor", a pro-steroid column for bodybuilding magazine Muscular Development
Muscular Development

Muscular Development is an USA fitness and bodybuilding magazine first published in 1964. It was founded by Bob Hoffman, the owner and founder of the York Barbell Company....
.

United Kingdom

In the United Kigdom, anabolic steroids are classified as class C drugs for their illegal abuse potential, which puts them in the same class as benzodiazepines. In 2008 a study published in the Lancet
Lancet

Lancet may refer to:*lancet , a medical instrument, similar to a scalpel but with a double-edged blade.*lancet, a needle used in a blood-sampling device....
 suggested that anabolic steroids are less dangerous than most other illegal substances.

Status in sports


Anabolic steroids are banned by all major sports bodies including the Olympics
Olympic Games

The Olympic Games are an international multi-sport event established for both summer and winter sports. There have been two generations of the Olympic Games; the first were the Ancient Olympic Games held at Olympia, Greece, Greece....
, the National Basketball Association
National Basketball Association

The National Basketball Association is North America's premier professional men's basketball league, composed of thirty teams: twenty-nine in the United States and one in Canada....
, the National Hockey League
National Hockey League

The National Hockey League is a professional ice hockey league composed of 30 teams in North America. It is considered to be the premier professional ice hockey league in the world, and one of the North American Major professional sports leagues of the United States and Canada....
, as well as the National Football League
National Football League

The National Football League is the Major North American professional sports leagues American football Sports league in the United States. It is an unincorporated 501#501.28c.29.286.29 association controlled by its members....
. The World Anti-Doping Agency
World Anti-Doping Agency

The World Anti-Doping Agency , , is an independent foundation created through a collective initiative led by the International Olympic Committee ....
 (WADA) maintains the list of performance-enhancing substances used by many major sports bodies and includes all anabolic agents, which includes all anabolic steroids and precursors as well as all hormones and related substances. Spain has passed an anti-doping law creating a national anti-doping agency. Italy passed a law in 2000 where penalties range up to three years in prison if an athlete has tested positive for banned substances. In 2006, Russian President Vladimir Putin
Vladimir Putin

Vladimir Vladimirovich Putin was the second President of Russia and is the current Prime Minister of Russia as well as chairman of United Russia and Chairman of the Council of Ministers of the Union of Russia and Belarus....
 signed into law ratification of the International Convention Against Doping in Sport which would encourage cooperation with WADA. Many other countries have similar legislation prohibiting anabolic steroids in sports including Denmark, France, the Netherlands and Sweden.

Illegal trade


Anabolic steroids are frequently produced in pharmaceutical laboratories, but in nations where stricter laws are present, they are also produced in small home made underground laboratories, sometimes in kitchen sinks, usually from raw substances imported from abroad. In these countries the majority of steroids are obtained illegally through black market trade. These steroids are usually manufactured in other countries, and therefore must be smuggled
Smuggling

Smuggling, also known as trafficking, is the clandestine transportation of goods or persons past a point where prohibited, such as out of a building, into a prison, or across an international border, in violation of the law or other rules....
 across international borders. Like most significant smuggling operations, organized crime
Organized crime

Organized crime or criminal organizations comprise groups or operations run by crimes, most commonly for the purpose of generating a money profit....
 is involved.

In the late 2000s the worldwide trade in illicit AAS increased significantly, and authorities announced record captures on three continents. In 2006 Finnish authorities announced a record seizure of 11.8 million AAS tables. A year later the DEA seized 11.4 million units of AAS in the largest U.S seizure ever. In first three months of 2008, Australian customs reported a record 300 seizures of AAS shipments.

In the U.S., Canada and Europe, illicit steroids are sometimes purchased just like any other illegal drug, through dealers who are able to obtain the drugs from a number of sources. Illegal anabolic steroids are sometimes sold at gyms, competitions, and through the mail, but may also be obtained through pharmacists, veterinarians, and physicians. In addition, a significant number of counterfeit products are sold as anabolic steroids, particularly via mail order from websites posing as overseas pharmacies. Individuals also produce fake steroids and attempt to sell them over the Internet, causing a wide variety of health concerns. In the U.S., black market importation continues from Mexico, Thailand, and other countries where steroids are more easily available as they are not illegal.

See also

  • Selective androgen receptor modulator
    Selective androgen receptor modulator

    Selective androgen receptor modulators or SARMs are a novel class of androgen receptor ligands. They are intended to have the same kind of effects as androgenic drugs like anabolic steroids but be much more selective in their action, allowing them to be used for many more clinical indications than the relatively limited legitimate uses...
  • Steroid stack


Further reading



External links