Library benzylmorphine Benzylmorphine (Peronine) is a semi-synthetic opioid narcotic introduced to the international market in 1896 and that of the United States…

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Library betameprodine Very little modern clinical data exist. Early 1950s human studies suggested β-meprodine is roughly equipotent to, or slightly less potent t…

Library bezitramide Withdrawn from Dutch market in 2004 following pediatric fatality. Extremely delayed onset encourages dangerous redosing before peak effects…

Library bromadol A very potent opioid that has an arylcyclohexylamine structure. Intial studies estimated that it was ~10,000x Morphine in animal studies. H…

Library bromadoline Bromadoline (U-47931E) is an opioid analgesic selective for the μ-opioid receptor developed by the Upjohn company in the 1970s. The drug ha…

Library brorphine Brorphine is a piperidine-based opioid analgesic compound. Brorphine was originally discovered in a 2018 paper investigating functionally b…

Library buprenorphine Buprenorphine is a semisynthetic opioid of the morphinan class, first discovered in 1966 at Reckitt & Colman's research laboratories in Eng…

Library butonitazene Butonitazene is a benzimidazole derivative with opioid effects, which has been sold over the internet as a designer drug. It has relatively…

Library butorphanol Butorphanol is marketed as Stadol (human formulation, now discontinued as brand name) and Torbugesic (veterinary). As a potent κ-opioid rec…

Library butyrfentanyl Butyrfentanyl is a potent short-acting synthetic opioid and analog of fentanyl, possessing approximately one quarter of its parent compound…

Library canadine Canadine, also known as (S)-tetrahydroberberine and xanthopuccine, is a benzylisoquinoline alkaloid (BIA), of the protoberberine structural…

Library carfentanil Carfentanil or carfentanyl, formerly sold under the brand name Wildnil, is an extremely potent opioid analgesic formerly used in veterinary…

Library carfentanyl Carfentanil or carfentanyl, formerly sold under the brand name Wildnil, is an extremely potent opioid analgesic formerly used in veterinary…

Library chlorphine

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Library cis3methylfentanyl

Library clonitazene An opioid that is roughly three times as potent as Morphine. Is related to Etonitazene, which is about 1000-1500x the potency of Morphine.

Library codeine Codeine is a naturally occurring opiate alkaloid found in the opium poppy (*Papaver somniferum*), first discovered by Pierre Jean Robiquet…

Library crotonylfentanyl Crotonylfentanyl is an opioid analgesic that is an analog of fentanyl and structural isomer of cyclopropylfentanyl and has been sold online…

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Library cychlorphine Extremely limited pharmacological data; field samples frequently contain co-contaminants including xylazine or chlorphine. Standard fentany…

Library cyclazocine Cyclazocine is a mixed opioid agonist/antagonist related to dezocine, pentazocine and phenazocine. It is in the benzomorphan and benzazocin…