Library ocfentanil Ocfentanil is a potent synthetic opioid structurally related to fentanyl that was developed in the early 1990s as one of a series of potent…

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Library odsmt O-Desmethyltramadol is an opioid analgesic and the primary active metabolite of tramadol. Since the 2010s, it has been available through th…

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Library orthomethylfentanyl

Library oxazepam Oxazepam is an intermediate-acting benzodiazepine prescribed for the treatment of anxiety disorders, panic disorders, alcohol withdrawal, a…

Library oxazolam A benzodiazepine derivative that is a prodrug for desmethyldiazepam.

Library oxycodone Oxycodone is a semisynthetic opioid of the morphinan class, synthesized from poppy-derived thebaine. Developed in Germany in 1916 as part o…

Library oxymorphone Oxymorphone (also known by the brand name Opana) is a semi-synthetic opioid analgesic used in the management of moderate to severe pain, an…

Library pagoclone An anxiolytic drug related to zopiclone with no sedative or hypnotic qualities. Has been investigated as a possible alcohol replacement. Re…

Library parafluorofentanyl Parafluorofentanyl is an extremely potent synthetic opioid and analogue of fentanyl, originally developed by Janssen Pharmaceutica during t…

Library pentazocine A synthetic opioid used as an analgesic. It is only used IM and IV in the medical field and has respiratory depressant effects. It is pregn…

Library pentobarbital Pentobarbital, also known as pentobarbitone in British English and by the brand name Nembutal, is a short-acting psychoactive drug of the b…

Library pethidine Pethidine, known as meperidine in the United States (sold under the brand name Demerol), is a synthetic opioid analgesic used for the treat…

Library phenazepam Phenazepam is a benzodiazepine first developed in the Soviet Union in 1975. It is prescribed in Russia and other countries for psychiatric…

Library phenelzine Phenelzine is classified as Antidepressant (irreversible, non-selective MAOI). It belongs to the Hydrazine derivative (β-phenylethylhydrazi…

Library phenibut Phenibut is a depressant and anxiolytic of the gabapentinoid class, structurally derived from the neurotransmitter GABA. Developed in the S…

Library phenobarbital Phenobarbital, also known as phenobarbitone in British English and by the brand name Luminal, is a long-acting psychoactive drug of the bar…

Library phenomorphan Phenomorphan is an opioid analgesic. It is not currently used in medicine, but has similar side-effects to other opiates, which include itc…

Library pholcodeine Pholcodine is an opioid cough suppressant (antitussive). It helps suppress unproductive coughs and also has a mild sedative effect, but has…

Library picamilon An analogue of GABA that does pass the brain blood barrier, which is then hydrolyzed into GABA and Niacin. In which the GABA could produce…

Library pinazepam Benzodiazepine that is solely an anxiolytic drug that lacks the hypnotic and motor impairment that most benzodiazepines do. The main metabo…