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| ECHA InfoCard | 100.000.389 |
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| Formula | C10H14O3 |
| Molar mass | 182.219 g·mol−1 |
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Mephenesin (INN), also calledmyanesin,[1][2] is a centrally actingmuscle relaxant. It can be used as anantidote forstrychnine poisoning. Mephenesin however presents with the major drawbacks of having a short duration of action and a much greater effect on the spinal cord than the brain, resulting in pronounced respiratory depression at clinical doses and therefore a very lowtherapeutic index. It is especially dangerous and potentially fatal in combination withalcohol and other depressants.[3] Mephenesin was the inspiration for the synthesis of a derivative of1,3-propanediol,meprobamate, by Bernard Ludwig andFrank Berger,[4] the first tranquilizer to see widespread clinical use. Mephenesin is no longer available in North America but is used in Italy and a few other countries.[5] Its use has largely been replaced by the related drugmethocarbamol, which is better absorbed.[6]
Mephenesin may be anNMDA receptor antagonist.[7] Mephenesin was previously used in France as an OTC muscle relaxant called Décontractyl but was taken out of production by Sanofi Aventis and due to a French Health Ministry decree in July 2019.
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