Library mebroqualone A short acting analogue of Methaqualone, that is much more potent.

Library meclonazepam Meclonazepam is a benzodiazepine derivative structurally related to clonazepam, first developed by Hoffmann-La Roche during the 1960s. It w…

Library medazepam Benzodiazepine derivative that has all of the classic benzodiazepine effects. Is a long-acting benzodiazepine drug (Half life of 36-200 hou…

Library medetomidine Medetomidine is a veterinary anesthetic medication with potent sedative effects. As of December 2025, it is an emerging illicit drug adulte…

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Library mephenaqualone Mephenaqualone is a central nervous system (CNS) depressant of the quinazolinone class that acts as a sedative and hypnotic. It is an analo…

Library metaclazepam A benzodiazepine derivative. Which is mostly an anxiolytic substance, without strong hypnotic properties that most benzodiazepines have. It…

Library metaqualone Methaqualone (brand name Quaalude in the US and Mandrax in the UK) is a central nervous system (CNS) depressant of the quinazolinone class…

Library metaxalone Metaxalone is a centrally acting skeletal-muscle relaxant, used to relieve pain and discomfort caused by muscle injuries.

Library methadone Methadone (sold under trade names such as Dolophine and Methadose) is a synthetic opioid analgesic used for the treatment of moderate to se…

Library methapyrilene Methapyrilene is an antihistamine and anticholinergic of the pyridine chemical class which was developed in the early 1950s. It was sold un…

Library methiodone IC-26 is an analogue of the opioid analgesic methadone, where the carbonyl group has been replaced by the bioisosteric sulfone group.

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Library methoxyacetylfentanyl Methoxyacetyl-fentanyl is a highly potent synthetic opioid and fentanyl analogue classified as a depressant research chemical. Like other f…

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Library methoxyqualone Methoxyqualone (2-Methoxyqualone) is a quinazolinone-class chemical compound which has been sold as a designer drug, first identified in In…

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Library methylclonazepam N-Methylclonazepam is a benzodiazepine derivative developed in the 1970s. It has sedative and hypnotic properties, and has around the same…

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Library methyldihydromorphine

Library methylenedioxynitazene Methylenedioxynitazene (3',4'-Methylenedioxynitazene) is a benzimidazole derivative which has been sold as a designer drug over the interne…

Library methylmethaqualone Methylmethaqualone is a depressant research chemical and a more potent structural analogue of methaqualone. It is characterized by a compar…

Library methyprylon Sedative of the pipeidinedone family. Was used for treating insomnia, yet is rarely used today due to substances with fewer side effects, s…

Library metizolam Metizolam is a synthetic depressant of the thienotriazolodiazepine class and the demethylated analogue of etizolam. A Japanese company pate…

Library metodesnitazene Metodesnitazene is a benzimidazole derivative with opioid effects, though unlike related compounds such as metonitazene and etodesnitazene…