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AH-7921
AH-7921 is a synthetic opioid analgesic1 in the benzamide chemical class2, with an N-substituted cyclohexylmethylbenzamide structure3. AH-7921 was developed as a synthetic analgesic by Allen & Hanburys in the UK in the 1970s3. Oral potency is reported at roughly 80–90% of morphine. In animal studies, doses producing analgesia were close to those producing side effects, including respiratory depression1, and AH-7921 was detected alongside other pharmacologically active substances in post-mortem biological samples from 14 reported deaths1.
Dosage & Duration
Dosage
Doses are population estimates that vary widely between individuals.
Duration
Subjective Effects
Pharmacology
Pharmacodynamics
Comparative studies in rodents indicated that AH-7921, like morphine, is a μ-opioid receptor agonist, though its analgesic activity may also involve κ-opioid receptors4. Binding studies in guinea pig brain tissue reported a μ-opioid receptor Ki of 10 nM4, with additional κ-opioid system involvement at a Ki of 50 nM. Animal studies found analgesic potency broadly similar to morphine4, although reported relative potency varied by study and endpoint.4
Pharmacokinetics
AH-7921 is predominantly converted to desmethyl-AH-79215, which can undergo further demethylation to di-desmethyl-AH-79215. The excerpts do not provide route-specific bioavailability, absorption, half-life, distribution, or elimination data.
Interactions
An unlisted combination is an unknown one, not a safe one. Check a dedicated combination chart before mixing.
Tolerance
Harm Potential
Addiction & Dependence
Psychological
AH-7921 is described as habit-forming.3
Physical
Rats given 20 mg three times daily for five days developed opioid-like withdrawal symptoms; users have reported depression and insomnia during withdrawal.
Toxicity
A 2018 review identified 14 published cases, 13 of which resulted in death. Fatalities occurred across low and high femoral-blood concentrations; one confirmed opioid-intoxication death had 3.9 mg/L in heart blood. A reliably low-risk dose cannot be established.
Excessive AH-7921 use can cause respiratory depression, with reported potency ranging from less to 1.6 times that of morphine; one report placed respiratory risk close to the effective analgesic dose.
Seizure Risk
Seizures are often reported during AH-7921 overdose.
History & Culture
Development and patenting
AH-7921 was designed and synthesized in the mid-1970s by researchers at Allen & Hanburys and the University of Aston as a potential analgesic. It was the most active compound in its series6, and the first report of its activity appeared in a 1973 paper on…
Legality
By Country
References
Citations
Article Status
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