Library spirochlorphine Marketed only as a research chemical with potency reported as 2-5 times that of fentanyl. Reported solubility approximately 3 mg/mL in 10%…

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Library sr14968 Sold exclusively as a research chemical with no clinical trials in humans. Despite biased agonist properties in vitro, behaves more like a…

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Library sr17018 Sold solely as a research chemical with no quality control or clinical data in humans. SR-17018 is not orally bioavailable when dissolved i…

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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…

Library tramadol Tramadol is a synthetic opioid analgesic of the phenylpropylamine class, structurally related to codeine and morphine. Developed in 1962 by…

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Library u47700 U-47700 is a synthetic opioid of the benzamide chemical class that produces analgesic, sedating, and euphoric effects. Developed by Upjohn…

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Library u48800 U-48800 is an opioid analgesic which has been sold as a designer drug. Unlike U-47700, it is primarily active as a kappa opioid receptor ag…

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Library u49731

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Library u49900 A substance that is an analogue of U-47700, yet doesn't share much with it. If you are interested in trying it, I recommend reading this. h…

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Library u51754 A very potent opioid, that seems to have a fair bit of κ-opioid action. So Dyshopria, Auditory hallucinations can be an effect. Is an analo…

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Library uf17