Convention for Limiting the Manufacture and Regulating the Distribution of Narcotic Drugs
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The Convention for Limiting the Manufacture and Regulating the Distribution of Narcotic Drugs was a drug control treaty promulgated in Geneva
Geneva
Geneva In the national languages of Switzerland the city is known as Genf , Ginevra and Genevra is the second-most-populous city in Switzerland and is the most populous city of Romandie, the French-speaking part of Switzerland...

 on 13 July 1931 that entered into force on 9 July 1933. It established two groups of drugs.

Group I consisted of:
  • Sub-group (a), which consisted of:
    • Morphine
      Morphine
      Morphine is a potent opiate analgesic medication and is considered to be the prototypical opioid. It was first isolated in 1804 by Friedrich Sertürner, first distributed by same in 1817, and first commercially sold by Merck in 1827, which at the time was a single small chemists' shop. It was more...

       and its salts, including preparations made directly from raw or medicinal opium
      Opium
      Opium is the dried latex obtained from the opium poppy . Opium contains up to 12% morphine, an alkaloid, which is frequently processed chemically to produce heroin for the illegal drug trade. The latex also includes codeine and non-narcotic alkaloids such as papaverine, thebaine and noscapine...

       and containing more than 20 percent of morphine;
    • Diacetylmorphine (Heroin) and the other ester
      Ester
      Esters are chemical compounds derived by reacting an oxoacid with a hydroxyl compound such as an alcohol or phenol. Esters are usually derived from an inorganic acid or organic acid in which at least one -OH group is replaced by an -O-alkyl group, and most commonly from carboxylic acids and...

      s of morphine and their salts;
    • Cocaine
      Cocaine
      Cocaine 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...

       and its salts, including preparations made direct from the coca
      Coca
      Coca, 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...

       leaf and containing more than 0.1 percent of cocaine, all the esters of ecgonine
      Ecgonine
      Ecgonine is an organic chemical and tropane alkaloid found naturally in coca leaves. It has a close structural relation to cocaine: it is both a metabolite and a precursor, and as such, it is a controlled substance, as are all known substances which can be used as precursors to ecgonine...

       and their salts;
    • Dihydrohydrooxycodeinone (of which the substance registered under the name of eucodal is a salt); dihydrocodeinone (of which the substance registered under the name of dicodide is a salt), dihydromorphinone (of which the substance registered under the name of dilaudide is a salt), acetyldihydrocodeinone or acetyldemethylodihydrothebaine (of which the substance registered under the name of acedicone is a salt); dihydromorphine
      Dihydromorphine
      Dihydromorphine is a semi-synthetic opioid invented in Germany in 1900. In structure, it is very similar to morphine, the only difference being the reduction of the double bond between positions 7 and 8 in morphine to a single bond...

       (of which the substance registered under the name of paramorfan is a salt), their esters and the salts of any of these substances and of their esters, morphine-N-oxide
      Morphine-N-oxide
      Morphine-N-oxide is an active opioid metabolite of morphine. Morphine itself, in trials with rats, acts 11–22 times more potent than morphine-N-oxide subcutaneously and 39–89 times more potent intraperitoneally...

       (registered trade name genomorphine), also the morphine-N-oxide derivatives, and the other pentavalent nitrogen morphine derivatives.
  • Sub-group (b), which consisted of:
    • Ecgonine, thebaine
      Thebaine
      Thebaine , its name coming from the Greek Θῆβαι, Thēbai, an ancient city in Upper Egypt, is an opiate alkaloid. A minor constituent of opium, thebaine is chemically similar to both morphine and codeine, but has stimulatory rather than depressant effects, causing convulsions similar to strychnine...

       and their salts, benzylmorphine
      Benzylmorphine
      Benzylmorphine is a semi-synthetic opiate narcotic introduced to the international market in 1896 and that of the United States very shortly thereafter...

       and the other ethers of morphine and their salts, except methylmorphine (codeine
      Codeine
      Codeine or 3-methylmorphine is an opiate used for its analgesic, antitussive, and antidiarrheal properties...

      ), ethylmorphine
      Ethylmorphine
      Ethylmorphine is an opiate narcotic analgesic .Ethylmorphine was invented in Germany at Merck in 1884 and was used as a weaker alternative to heroin for all indications. Chemically, ethylmorphine is a morphine molecule with a -25 group substituted for the aromatic 3- group...

       and their salts.


Group II consisted of:
  • Methylmorphine (codeine), ethylmorphine and their salts.


Group I was subject to stricter regulations than Group II. For instance, in estimating the amount of drugs needed for medical and scientific needs, the margin allowed for demand fluctuations was wider for Group II drugs than for Group I drugs. Also, in certain reports, a summary statement would be sufficient for matters related to Group II drugs. The establishment of these rudimentary groups foreshadowed the development of the drug scheduling system that exists today. Both the 1961 Single Convention on Narcotic Drugs
Single Convention on Narcotic Drugs
The Single Convention on Narcotic Drugs of 1961 is an international treaty to prohibit production and supply of specific drugs and of drugs with similar effects except under licence for specific purposes, such as medical treatment and research...

 and the 1971 Convention on Psychotropic Substances
Convention on Psychotropic Substances
The Convention on Psychotropic Substances of 1971 is a United Nations treaty designed to control psychoactive drugs such as amphetamines, barbiturates, benzodiazepines, and psychedelics signed at Vienna on February 21, 1971...

 have Schedules of controlled substances. The 1988 United Nations Convention Against Illicit Traffic in Narcotic Drugs and Psychotropic Substances
United Nations Convention Against Illicit Traffic in Narcotic Drugs and Psychotropic Substances
The United Nations Convention Against Illicit Traffic in Narcotic Drugs and Psychotropic Substances of 1988 is one of three major drug control treaties currently in force. It provides additional legal mechanisms for enforcing the 1961 Single Convention on Narcotic Drugs and the 1971 Convention on...

 has two Tables of controlled precursor chemicals.

The 1931 Convention's scope was broadened considerably by the 1948 Protocol Bringing under International Control Drugs outside the Scope of the Convention of 13 July 1931 for Limiting the Manufacture and Regulating the Distribution of Narcotic Drugs. The Convention was superseded by the 1961 Single Convention on Narcotic Drugs
Single Convention on Narcotic Drugs
The Single Convention on Narcotic Drugs of 1961 is an international treaty to prohibit production and supply of specific drugs and of drugs with similar effects except under licence for specific purposes, such as medical treatment and research...

.
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