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Library propoxyphene Is an analgesic in the opioid family. It is intended for mild pain and for its antitussive effects. Has been taken off the market in Europe…

Library protodesnitazene Protodesnitazene is a benzimidazole derivative which has been sold as a designer drug, and has potent opioid effects. It has been identifie…

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Library protonitazene Protonitazene is classified as Opioid analgesic. It belongs to the Benzimidazole opioid (nitazene family) chemical class.

Library pseudocodeine Pseudocodeine is an isomer of codeine, once studied for its use as an analgesic. Like codeine, its neighbouring alkene and alcohol groups a…

Library pst Poppy Tea can be made from poppy pods, stalks and seeds, and contains various opium alkaloids including primarily Morphine, as well as Code…

Library racemorphan Racemorphan, or morphanol, is the racemic mixture of the two stereoisomers of 17-methylmorphinan-3-ol, each with differing pharmacology and…

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Library spirobrorphine Spirobrorphine is a synthetic opioid chemical compound which has been sold as a designer drug, first reported in the USA in February 2026.…

Library spirochlorphine R6890, sometimes known as spirochlorphine, is an opioid analgesic and a member of the spiropiperidine family of agents. The first known men…

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Library sr14968 SR-14968 is a drug which acts as a biased agonist at the μ-opioid receptor, selective for activation of the G-protein signalling pathway ov…

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Library sr17018 SR-17018, also known informally as SR-17 or just SR and as 5,6-dichloro-desmethylchlorphine, is an atypical opioid receptor modulator with…

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Library suboxone Buprenorphine/naloxone, sold under the brand name Suboxone among others, is a fixed-dose combination medication that includes buprenorphine…

Library sufentanil Sufentanil, also known as sufentanyl and by the brand name Sufenta, is an extremely potent synthetic anilidopiperidine opioid analgesic. Su…

Library tapentadol Tapentadol is a centrally-acting synthetic opioid analgesic of the phenylpropylaminopentane class. First approved by the FDA in 2008, it po…

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Library tetrahydrofuranfentanyl An analogue of fentanyl that is unknown in literature. Is most likely less potent than most other analogues. Yet very few reports are aroun…

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Library tetramethylcyclopropanefentanyl

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Library tetramethylfentanyl

Library thebaine Thebaine (paramorphine), also known as codeine methyl enol ether, is an opiate alkaloid, its name coming from the Greek Θῆβαι, Thēbai (Theb…

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Library thiophenefentanyl

Library tianeptine Tianeptine is an atypical tricyclic antidepressant of the dibenzothiazepine class. Unlike typical tricyclics, it is thought to act primaril…

Library tilidine Synthetic opioid, used mainly for treatment of moderate to severe pain. In some countries it's mixed with Naloxone to lower the abuse liabi…