Mephenaqualone is an analogue of the sedative and hypnotic drug methaqualone which has been sold as a designer drug. It was reported in Germany in 2025 as a contributor to drug overdose cases but has otherwise been little studied. Anecdotal reports suggest it is considerably more potent than methaqualone with a potency similar to that of benzodiazepine derivatives, but no pharmacological data is available as yet. It is reported to have a dose of 0.7–0.8mg or 2mg orally and to produce sedative, hypnotic, euphoric, anxiolytic, and pro-sexual effects among others. Its onset is 20minutes and its duration is approximately 4 to 10hours.
See also MCPPQ List of methaqualone analogues
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