Stimulants are
psychoactive drugA psychoactive drug, psychopharmaceutical, or psychotropic is a chemical substance that crosses the blood–brain barrier and acts primarily upon the central nervous system where it affects brain function, resulting in changes in perception, mood, consciousness, cognition, and behavior...
s which induce temporary improvements in either mental or physical function or both. Examples of these kinds of effects may include enhanced alertness, wakefulness, and locomotion, among others. Due to their effects typically having an "up" quality to them, stimulants are also occasionally referred to as "
uppers".
DepressantA depressant, or central depressant, is a drug or endogenous compound that depresses the function or activity of a specific part of the brain...
s or "downers", which decrease mental and/or physical function, are in stark contrast to stimulants and are considered to be their functional opposites. Stimulants are widely used throughout the world as prescription medicines and as
illicit substancesThe prohibition of drugs through sumptuary legislation or religious law is a common means of attempting to prevent drug use. Prohibition of drugs has existed at various levels of government or other authority from the Middle Ages to the present....
of
recreational useRecreational drug use is the use of a drug, usually psychoactive, with the intention of creating or enhancing recreational experience. Such use is controversial, however, often being considered to be also drug abuse, and it is often illegal...
or
abuseSubstance abuse, also known as drug abuse, refers to a maladaptive pattern of use of a substance that is not considered dependent. The term "drug abuse" does not exclude dependency, but is otherwise used in a similar manner in nonmedical contexts...
.
Effects
Stimulants (analeptics) produce a variety of different kinds of effects by enhancing the activity of the
centralThe central nervous system is the part of the nervous system that integrates the information that it receives from, and coordinates the activity of, all parts of the bodies of bilaterian animals—that is, all multicellular animals except sponges and radially symmetric animals such as jellyfish...
and
peripheral nervous systemThe peripheral nervous system consists of the nerves and ganglia outside of the brain and spinal cord. The main function of the PNS is to connect the central nervous system to the limbs and organs. Unlike the CNS, the PNS is not protected by the bone of spine and skull, or by the blood–brain...
s. Common effects, which vary depending on the substance in question, may include enhanced
alertnessAlertness is the state of paying close and continuous attention, being watchful and prompt to meet danger or emergency, or being quick to perceive and act. It is related to psychology as well as to physiology...
,
awarenessAwareness is the state or ability to perceive, to feel, or to be conscious of events, objects or sensory patterns. In this level of consciousness, sense data can be confirmed by an observer without necessarily implying understanding. More broadly, it is the state or quality of being aware of...
, wakefulness,
enduranceEndurance is the ability for a human or animal to exert itself and remain active for a long period of time, as well as its ability to resist, withstand, recover from, and have immunity to trauma, wounds, or fatigue. In humans, it is usually used in aerobic or anaerobic exercise...
,
productivityProductivity is a measure of the efficiency of production. Productivity is a ratio of what is produced to what is required to produce it. Usually this ratio is in the form of an average, expressing the total output divided by the total input...
, and
motivationMotivation is the driving force by which humans achieve their goals. Motivation is said to be intrinsic or extrinsic. The term is generally used for humans but it can also be used to describe the causes for animal behavior as well. This article refers to human motivation...
, increased
arousalArousal is a physiological and psychological state of being awake or reactive to stimuli. It involves the activation of the reticular activating system in the brain stem, the autonomic nervous system and the endocrine system, leading to increased heart rate and blood pressure and a condition of...
,
locomotionAnimal locomotion, which is the act of self-propulsion by an animal, has many manifestations, including running, swimming, jumping and flying. Animals move for a variety of reasons, such as to find food, a mate, or a suitable microhabitat, and to escape predators...
,
heart rateHeart rate is the number of heartbeats per unit of time, typically expressed as beats per minute . Heart rate can vary as the body's need to absorb oxygen and excrete carbon dioxide changes, such as during exercise or sleep....
, and
blood pressureBlood pressure is the pressure exerted by circulating blood upon the walls of blood vessels, and is one of the principal vital signs. When used without further specification, "blood pressure" usually refers to the arterial pressure of the systemic circulation. During each heartbeat, BP varies...
, and the perception of a diminished requirement for
foodFood is any substance consumed to provide nutritional support for the body. It is usually of plant or animal origin, and contains essential nutrients, such as carbohydrates, fats, proteins, vitamins, or minerals...
and
sleepSleep is a naturally recurring state characterized by reduced or absent consciousness, relatively suspended sensory activity, and inactivity of nearly all voluntary muscles. It is distinguished from quiet wakefulness by a decreased ability to react to stimuli, and is more easily reversible than...
. Many stimulants are also capable of improving mood and relieving anxiety, and some can even induce feelings of
euphoriaEuphoria is an emotional and mental state defined as a sense of great elation and well being.Euphoria may also refer to:* Euphoria , a genus of scarab beetles* Euphoria, a genus name previously used for the longan and other trees...
. It should be noted, however, that many of these drugs are also capable of causing anxiety and heart failure, even the ones that may paradoxically reduce it to a degree at the same time. Stimulants exert their effects through a number of different pharmacological mechanisms, the most prominent of which include facilitation of
norepinephrineNorepinephrine is the US name for noradrenaline , a catecholamine with multiple roles including as a hormone and a neurotransmitter...
(noradrenaline) and/or
dopamineDopamine is a catecholamine neurotransmitter present in a wide variety of animals, including both vertebrates and invertebrates. In the brain, this substituted phenethylamine functions as a neurotransmitter, activating the five known types of dopamine receptors—D1, D2, D3, D4, and D5—and their...
activity (e.g., via
monoamine transporterMonoamine transporters are protein structures that function as integral plasma membrane transporters to regulate concentrations of extracellular monoamine neurotransmitters. Three major classes of MATs are responsible for the reuptake of their associated amine neurotransmitters...
inhibition or reversal),
adenosine receptorThe adenosine receptors are a class of purinergic receptors, G protein-coupled receptors with adenosine as endogenous ligand.-Pharmacology:...
antagonismA receptor antagonist is a type of receptor ligand or drug that does not provoke a biological response itself upon binding to a receptor, but blocks or dampens agonist-mediated responses...
, and
nicotinic acetylcholine receptorNicotinic acetylcholine receptors, or nAChRs, are cholinergic receptors that form ligand-gated ion channels in the plasma membranes of certain neurons and on the postsynaptic side of the neuromuscular junction...
agonismAn agonist is a chemical that binds to a receptor of a cell and triggers a response by that cell. Agonists often mimic the action of a naturally occurring substance...
.
Indications
Stimulants are used both individually and clinically for therapeutic purposes in the treatment of a number of indications, including the following:
- To counteract lethargy and fatigue throughout the day while at work or while doing other activities.
- To reduce sleepiness and to keep the person awake when necessary, as well as to treat narcolepsy
Narcolepsy is a chronic sleep disorder, or dyssomnia, characterized by excessive sleepiness and sleep attacks at inappropriate times, such as while at work. People with narcolepsy often experience disturbed nocturnal sleep and an abnormal daytime sleep pattern, which often is confused with insomnia...
.
- To decrease appetite and promote weight loss, as well as to treat obesity
Obesity is a medical condition in which excess body fat has accumulated to the extent that it may have an adverse effect on health, leading to reduced life expectancy and/or increased health problems...
.
- To improve concentration and focus while at work or school, especially for those with attentional disorders such as ADHD.
- Occasionally, they are also used off label to treat clinical depression
Major depressive disorder is a mental disorder characterized by an all-encompassing low mood accompanied by low self-esteem, and by loss of interest or pleasure in normally enjoyable activities...
, more particularly, non-typical depression and treatment-resistant depression.
Caffeine
Caffeine is a mild stimulant compound that is found naturally in
coffeeCoffee is a brewed beverage with a dark,init brooo acidic flavor prepared from the roasted seeds of the coffee plant, colloquially called coffee beans. The beans are found in coffee cherries, which grow on trees cultivated in over 70 countries, primarily in equatorial Latin America, Southeast Asia,...
,
teaTea is an aromatic beverage prepared by adding cured leaves of the Camellia sinensis plant to hot water. The term also refers to the plant itself. After water, tea is the most widely consumed beverage in the world...
, and to a lesser degree, in
cocoaCocoa solids are the low-fat component of chocolate. When sold as an end product, it may also be called cocoa powder, cocoa, and cacao....
or
chocolateChocolate is a raw or processed food produced from the seed of the tropical Theobroma cacao tree. Cacao has been cultivated for at least three millennia in Mexico, Central and South America. Its earliest documented use is around 1100 BC...
. It is included in many
soft drinkA soft drink is a non-alcoholic beverage that typically contains water , a sweetener, and a flavoring agent...
s, as well as a larger amount in
energy drinkEnergy drinks are beverages whose producers advertise that they "boost energy." These advertisements usually do not emphasize energy derived from the sugar and caffeine they contain but rather increased energy release due to a variety of stimulants and vitamins....
s. Caffeine is the world's most widely used psychoactive drug and by far the most common stimulant. The vast majority (over 85%) of people in the United States consume caffeine on a daily basis. Few jurisdictions restrict its sale and use. Caffeine is also included in some medications, usually for the purpose of enhancing the effect of the primary ingredient, or reducing one of its side effects (especially drowsiness). Tablets containing standardized doses of caffeine are also widely available.
Nicotine
NicotineNicotine is an alkaloid found in the nightshade family of plants that constitutes approximately 0.6–3.0% of the dry weight of tobacco, with biosynthesis taking place in the roots and accumulation occurring in the leaves...
is the active chemical constituent in
tobaccoTobacco is an agricultural product processed from the leaves of plants in the genus Nicotiana. It can be consumed, used as a pesticide and, in the form of nicotine tartrate, used in some medicines...
, which is available in many forms, including
cigaretteA cigarette is a small roll of finely cut tobacco leaves wrapped in a cylinder of thin paper for smoking. The cigarette is ignited at one end and allowed to smoulder; its smoke is inhaled from the other end, which is held in or to the mouth and in some cases a cigarette holder may be used as well...
s,
cigarA cigar is a tightly-rolled bundle of dried and fermented tobacco that is ignited so that its smoke may be drawn into the mouth. Cigar tobacco is grown in significant quantities in Brazil, Cameroon, Cuba, the Dominican Republic, Honduras, Indonesia, Mexico, Nicaragua, Philippines, and the Eastern...
s,
chewing tobaccoChewing tobacco Chewing tobacco Chewing tobacco (also known colloquially as hoobastank, backy, tobac, doogooos,Hogleg, chewpoos, chits, chewsky, chawsky, dip, flab, chowers, guy, or a wad, as well as referred to as dipsky, snuff, a pinch, a yopper, a Packing a bomb, a tobbackey or packing a...
, and
smoking cessationSmoking cessation is the process of discontinuing the practice of inhaling a smoked substance. This article focuses exclusively on cessation of tobacco smoking; however, the methods described may apply to cessation of smoking other substances that can be difficult to stop using due to the...
aids such as
nicotine patchA nicotine patch is a transdermal patch that releases nicotine into the body through the skin. It is used as an aid in nicotine replacement therapy , a process for smoking cessation. The first published study of the pharmacokinetics of a transdermal nicotine patch in humans was authored by Jed E....
es and
nicotine gumNicotine gum is a type of chewing gum that delivers nicotine to the body. It is used as an aid in nicotine replacement therapy , a process for smoking cessation and quitting smokeless tobacco. The nicotine is delivered to the bloodstream via absorption by the tissues of the mouth.It is currently...
. Nicotine is used widely throughout the world for its stimulating effects.
Amphetamines
Amphetamines are a group of phenylethylamine stimulants such as amphetamine and methamphetamine. Like
NDRIsA norepinephrine-dopamine reuptake inhibitor is a drug which acts as a reuptake inhibitor for the neurotransmitters norepinephrine and dopamine by blocking the action of the norepinephrine transporter and the dopamine transporter , respectively...
, amphetamine increases the levels of norepinephrine and dopamine in the brain via reuptake inhibition; however, the more important mechanism by which amphetamines cause stimulation is through the direct release of these
catecholamineCatecholamines are molecules that have a catechol nucleus consisting of benzene with two hydroxyl side groups and a side-chain amine. They include dopamine, as well as the "fight-or-flight" hormones adrenaline and noradrenaline released by the adrenal medulla of the adrenal glands in response to...
s from storage
vesiclesA vesicle is a bubble of liquid within another liquid, a supramolecular assembly made up of many different molecules. More technically, a vesicle is a small membrane-enclosed sack that can store or transport substances. Vesicles can form naturally because of the properties of lipid membranes , or...
in cells. Amphetamines are known to cause elevated mood and
euphoriaEuphoria is an emotional and mental state defined as a sense of great elation and well being.Euphoria may also refer to:* Euphoria , a genus of scarab beetles* Euphoria, a genus name previously used for the longan and other trees...
as well as rebound
depressionMajor depressive disorder is a mental disorder characterized by an all-encompassing low mood accompanied by low self-esteem, and by loss of interest or pleasure in normally enjoyable activities...
and
anxietyAnxiety is a psychological and physiological state characterized by somatic, emotional, cognitive, and behavioral components. The root meaning of the word anxiety is 'to vex or trouble'; in either presence or absence of psychological stress, anxiety can create feelings of fear, worry, uneasiness,...
.
AmphetamineAmphetamine or amfetamine is a psychostimulant drug of the phenethylamine class which produces increased wakefulness and focus in association with decreased fatigue and appetite.Brand names of medications that contain, or metabolize into, amphetamine include Adderall, Dexedrine, Dextrostat,...
s are often used for their therapeutic effects; physicians occasionally prescribe
amphetamineAmphetamine or amfetamine is a psychostimulant drug of the phenethylamine class which produces increased wakefulness and focus in association with decreased fatigue and appetite.Brand names of medications that contain, or metabolize into, amphetamine include Adderall, Dexedrine, Dextrostat,...
s to treat major depression, where subjects do not respond well to traditional
SSRI Selective serotonin re-uptake inhibitors or serotonin-specific reuptake inhibitor are a class of compounds typically used as antidepressants in the treatment of depression, anxiety disorders, and some personality disorders. The efficacy of SSRIs is disputed...
medications, and numerous studies have demonstrated the effectiveness of drugs such as
AdderallAdderall is a brand name of amphetamine salts–based medication used for attention-deficit hyperactivity disorder and narcolepsy. It is a brand-name psychostimulant medication composed of racemic amphetamine aspartate monohydrate, racemic amphetamine sulfate, dextroamphetamine saccharide, and...
in controlling symptoms associated with
ADDADHD predominantly inattentive is one of the three subtypes of Attention-deficit hyperactivity disorder . While ADHD-PI is sometimes still called "attention deficit disorder" by the general public, these older terms were formally changed in 1994 in the new Diagnostic and Statistical Manual of...
/
ADHDAttention deficit hyperactivity disorder is a developmental disorder. It is primarily characterized by "the co-existence of attentional problems and hyperactivity, with each behavior occurring infrequently alone" and symptoms starting before seven years of age.ADHD is the most commonly studied and...
. In rare cases,
ADDADHD predominantly inattentive is one of the three subtypes of Attention-deficit hyperactivity disorder . While ADHD-PI is sometimes still called "attention deficit disorder" by the general public, these older terms were formally changed in 1994 in the new Diagnostic and Statistical Manual of...
/
ADHDAttention deficit hyperactivity disorder is a developmental disorder. It is primarily characterized by "the co-existence of attentional problems and hyperactivity, with each behavior occurring infrequently alone" and symptoms starting before seven years of age.ADHD is the most commonly studied and...
patients who are not responding sufficiently to traditional
amphetamineAmphetamine or amfetamine is a psychostimulant drug of the phenethylamine class which produces increased wakefulness and focus in association with decreased fatigue and appetite.Brand names of medications that contain, or metabolize into, amphetamine include Adderall, Dexedrine, Dextrostat,...
s are prescribed dextrorotary
methamphetamine Methamphetamine is a psychostimulant of the phenethylamine and amphetamine class of psychoactive drugs...
. Due to their availability and fast-acting effects,
amphetamineAmphetamine or amfetamine is a psychostimulant drug of the phenethylamine class which produces increased wakefulness and focus in association with decreased fatigue and appetite.Brand names of medications that contain, or metabolize into, amphetamine include Adderall, Dexedrine, Dextrostat,...
s are prime candidates for abuse.
MDMA ("Ecstasy")
Methylenedioxymethamphetamine (MDMA), known by its common street name "Ecstasy", is an illicit substance that typically comes in either tablet, capsule, or powder/crystal form. It had a medical application as a treatment for depression until 1985 when the DEA placed MDMA into schedule 1, prohibiting most medical studies and applications. Notably, MDMA is also unique and very popular for its entactogenic properties. The stimulant effects of MDMA include
hypertensionHypertension or high blood pressure is a cardiac chronic medical condition in which the systemic arterial blood pressure is elevated. What that means is that the heart is having to work harder than it should to pump the blood around the body. Blood pressure involves two measurements, systolic and...
,
anorexiaAnorexia is the decreased sensation of appetite...
(appetite loss),
euphoriaEuphoria is an emotional and mental state defined as a sense of great elation and well being.Euphoria may also refer to:* Euphoria , a genus of scarab beetles* Euphoria, a genus name previously used for the longan and other trees...
, social disinhibition,
insomniaInsomnia is most often defined by an individual's report of sleeping difficulties. While the term is sometimes used in sleep literature to describe a disorder demonstrated by polysomnographic evidence of disturbed sleep, insomnia is often defined as a positive response to either of two questions:...
(or enhanced wakefulness), improved energy, increased arousal, and increased perspiration, among others.
Cocaine
Cocaine is made from the leaves of the
cocaCoca, Erythroxylum coca, is a plant in the family Erythroxylaceae, native to western South America. The plant plays a significant role in many traditional Andean cultures...
shrub, which grows in the mountain regions of South American countries such as
BoliviaBolivia officially known as Plurinational State of Bolivia , is a landlocked country in central South America. It is the poorest country in South America...
,
ColombiaColombia, officially the Republic of Colombia , is a unitary constitutional republic comprising thirty-two departments. The country is located in northwestern South America, bordered to the east by Venezuela and Brazil; to the south by Ecuador and Peru; to the north by the Caribbean Sea; to the...
, and
PeruPeru , officially the Republic of Peru , is a country in western South America. It is bordered on the north by Ecuador and Colombia, on the east by Brazil, on the southeast by Bolivia, on the south by Chile, and on the west by the Pacific Ocean....
. In Europe, North America, and in some parts of Asia, the most common form of cocaine is a white crystalline powder. Cocaine is a stimulant but is not normally prescribed therapeutically for its stimulant properties, although it sees clinical use as a local anesthetic, particularly in
ophthalmologyOphthalmology is the branch of medicine that deals with the anatomy, physiology and diseases of the eye. An ophthalmologist is a specialist in medical and surgical eye problems...
. Most cocaine use is recreational and its abuse potential is high, and so its sale and possession are strictly controlled in most jurisdictions. Other
tropaneTropane is a nitrogenous bicyclic organic compound. It is mainly known for a group of alkaloids derived from it , which include, among others, atropine and cocaine. Both alkaloids contain tropinone from which tropane is a derivate...
derivative drugs related to cocaine are also known such as troparil and lometopane but have not been widely sold or used recreationally.
NRIs & NDRIs
These drugs inhibit the reuptake of norepinephrine and/or dopamine, resulting in increased extracellular levels and therefore enhanced neurotransmission, ultimately producing a stimulant effect. Many of these compounds are used as ADHD medications and antidepressants. The best-known NDRI is
bupropionBupropion is an atypical antidepressant and smoking cessation aid. The drug is a non-tricyclic antidepressant and differs from most commonly prescribed antidepressants such as SSRIs, as its primary pharmacological action is thought to be norepinephrine-dopamine reuptake inhibition...
(Wellbutrin, Zyban), and the two best-known NRIs are
atomoxetine (Strattera) and
reboxetineReboxetine is a drug marketed as an antidepressant for use in the treatment of clinical depression, panic disorder and ADD/ADHD, developed by Pharmacia . Its mesylate salt is sold under tradenames including Edronax, Norebox, Prolift, Solvex, Davedax or Vestra...
(Edronax). Many of these drugs have a considerably lower abuse potential in comparison to other stimulants like the amphetamines and cocaine.
Methylphenidate
MethylphenidateMethylphenidate is a psychostimulant drug approved for treatment of attention-deficit hyperactivity disorder, postural orthostatic tachycardia syndrome and narcolepsy. It may also be prescribed for off-label use in treatment-resistant cases of lethargy, depression, neural insult and obesity...
(
MPH;
Ritalin,
Concerta,
Metadate, or
Methylin) is a
drugA drug, broadly speaking, is any substance that, when absorbed into the body of a living organism, alters normal bodily function. There is no single, precise definition, as there are different meanings in drug control law, government regulations, medicine, and colloquial usage.In pharmacology, a...
approved for
treatmentThis is a list of types of therapy .* Adventure therapy* Animal-assisted therapy* Aquatic therapy* Aromatherapy* Art and dementia* Art therapy* Authentic Movement* Behavioral therapy* Bibliotherapy* Buteyko Method* Chemotherapy...
of
attention-deficit hyperactivity disorderAttention deficit hyperactivity disorder is a developmental disorder. It is primarily characterized by "the co-existence of attentional problems and hyperactivity, with each behavior occurring infrequently alone" and symptoms starting before seven years of age.ADHD is the most commonly studied and...
,
postural orthostatic tachycardia syndromePostural orthostatic tachycardia syndrome is a condition of dysautonomia, more specifically orthostatic intolerance, in which a change from the supine position to an upright position causes an abnormally large increase in heart rate, called tachycardia...
, and
narcolepsyNarcolepsy is a chronic sleep disorder, or dyssomnia, characterized by excessive sleepiness and sleep attacks at inappropriate times, such as while at work. People with narcolepsy often experience disturbed nocturnal sleep and an abnormal daytime sleep pattern, which often is confused with insomnia...
. It belongs to the
piperidinePiperidine is an organic compound with the molecular formula 5NH. This heterocyclic amine consists of a six-membered ring containing five methylene units and one nitrogen atom...
class of compounds and increases the levels of
dopamineDopamine is a catecholamine neurotransmitter present in a wide variety of animals, including both vertebrates and invertebrates. In the brain, this substituted phenethylamine functions as a neurotransmitter, activating the five known types of dopamine receptors—D1, D2, D3, D4, and D5—and their...
and
norepinephrineNorepinephrine is the US name for noradrenaline , a catecholamine with multiple roles including as a hormone and a neurotransmitter...
in the brain through
reuptake inhibitionA reuptake inhibitor , also known as a transporter blocker, is a drug that inhibits the plasmalemmal transporter-mediated reuptake of a neurotransmitter from the synapse into the pre-synaptic neuron, leading to an increase in the extracellular concentrations of the neurotransmitter and therefore an...
of the
monoamine transporterMonoamine transporters are protein structures that function as integral plasma membrane transporters to regulate concentrations of extracellular monoamine neurotransmitters. Three major classes of MATs are responsible for the reuptake of their associated amine neurotransmitters...
s. It also increases the release of dopamine and norepinephrine. MPH possesses structural similarities to
amphetamineAmphetamine or amfetamine is a psychostimulant drug of the phenethylamine class which produces increased wakefulness and focus in association with decreased fatigue and appetite.Brand names of medications that contain, or metabolize into, amphetamine include Adderall, Dexedrine, Dextrostat,...
, and, though it is less potent, its pharmacological effects are even more closely related to those of
cocaineCocaine is a crystalline tropane alkaloid that is obtained from the leaves of the coca plant. The name comes from "coca" in addition to the alkaloid suffix -ine, forming cocaine. It is a stimulant of the central nervous system, an appetite suppressant, and a topical anesthetic...
.
Modafinil, Adrafinil, and Armodafinil
Modafinil (Provigil/Alertec/Modavigil) is an analeptic drug approved by the (FDA) for the treatment of narcolepsy, shift work sleep disorder, and excessive daytime sleepiness associated with obstructive sleep apnea.
Modafinil, like other stimulants, increases the release of monoamines but also elevates hypothalamic histamine levels, leading some researchers to consider Modafinil a "wakefulness promoting agent" rather than a classic amphetamine-like stimulant.
Modafinil has been shown to be effective in the treatment of Attention-Deficit Hyperactivity Disorder (ADHD), depression, cocaine addiction, Parkinson's Disease, schizophrenia, shift workers' sleep disorder and disease-related fatigue.
AdrafinilAdrafinil is a mild central nervous system stimulant drug used to relieve excessive sleepiness and inattention in elderly patients...
is the prodrug of Modafinil, and is metabolized into it in about one hour, when taken on an empty stomach.
ArmodafinilArmodafinil is a stimulant-like drug produced by the pharmaceutical company Cephalon Inc., which was approved by the FDA on June 15, 2007...
is a new version of Modafinil.
Ampakines
Recently, there have been improvements in the area of stimulant pharmacology, producing a class of chemicals known as
ampakineAmpakines are a class of compounds known to enhance attention span and alertness, and facilitate learning and memory. The ampakines take their name from the glutamatergic AMPA receptor with which they strongly interact...
s, or
eugeroicEugeroics are a chemical class of psychoactive drugs which act as stimulants, and are also known as wakefulness-promoting agents. They are used mainly in the treatment of sleeping disorders, excessive daytime sleepiness and narcolepsy, though they are also used merely to counteract fatigue and...
s, (
good arousal). These stimulants tend to increase alertness without the peripheral (body) effects or addiction/tolerance/abuse potential of the traditional stimulants. They have minimal effect on sleep structure, and do not cause rebound hypersomnolence or "come down" effects. Ampakines such as ampalex and
CX717CX717 is an ampakine compound created by Christopher Marrs and Gary Rogers in 1996 at Cortex Pharmaceuticals. It affects the neurotransmitter glutamate, with trials showing the drug improves cognitive functioning and memory.-Approval process:In 2005 the U.S...
have been developed but are still in clinical trials and have not yet been sold commercially. Another compound with similar effects to these drugs is
carphedonPhenotropil is a derivative of the nootropic drug -4-pheyl-2-pyrrolidon. It was developed in Russia, and a small number of low-scale clinical studies have shown possible links between prescription of carphedon and improvement in a number of encephalopathic conditions, including lesions of cerebral...
, which is sold as a general stimulant in Russia under the brand name Phenotropil.
Yohimbine
Yohimbine is a psychoactive drug of the
tryptamineTryptamine is a monoamine alkaloid found in plants, fungi, and animals. It is based around the indole ring structure, and is chemically related to the amino acid tryptophan, from which its name is derived...
chemical class with stimulant and aphrodisiac effects. Yohimbine is sometimes used to remedy
Type-2 DiabetesDiabetes mellitus type 2formerly non-insulin-dependent diabetes mellitus or adult-onset diabetesis a metabolic disorder that is characterized by high blood glucose in the context of insulin resistance and relative insulin deficiency. Diabetes is often initially managed by increasing exercise and...
in animals and humans that carry the polymorphisms of the α2A-adrenergic receptor gene.
Abuse
AbuseSubstance abuse, also known as drug abuse, refers to a maladaptive pattern of use of a substance that is not considered dependent. The term "drug abuse" does not exclude dependency, but is otherwise used in a similar manner in nonmedical contexts...
of
central nervous systemThe central nervous system is the part of the nervous system that integrates the information that it receives from, and coordinates the activity of, all parts of the bodies of bilaterian animals—that is, all multicellular animals except sponges and radially symmetric animals such as jellyfish...
stimulants is common.
AddictionSubstance use disorders include substance abuse and substance dependence. In DSM-IV, the conditions are formally diagnosed as one or the other, but it has been proposed that DSM-5 combine the two into a single condition called "Substance-use disorder"....
to CNS stimulants can quickly lead to medical, psychiatric and
psychosocialFor a concept to be psychosocial means it relates to one's psychological development in, and interaction with, a social environment. The individual needs not be fully aware of this relationship with his or her environment. It was first commonly used by psychologist Erik Erikson in his stages of...
deterioration. Drug tolerance, dependence, sensitisation as well as a
withdrawalWithdrawal can refer to any sort of separation, but is most commonly used to describe the group of symptoms that occurs upon the abrupt discontinuation/separation or a decrease in dosage of the intake of medications, recreational drugs, and alcohol...
syndrome can occur.
Testing
The presence of stimulants in the body may be tested by a variety of procedures. Serum and urine are the common sources of testing material although saliva is sometimes used. Commonly used tests include chromatography, immunologic assay and mass spectrometry.
External links