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Clinical data
AHFS/Drugs.comInternational Drug Names
ATC code
CAS Number
PubChem CID
CompTox Dashboard (EPA)
ECHA InfoCard100.000.389 Edit this at Wikidata
Chemical and physical data
Molar mass182.216 g/mol g·mol−1
3D model (JSmol)
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Mephenesin is a centrally acting muscle relaxant. It can be used as an antidote for strychnine 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 low therapeutic index. It is especially dangerous and potentially fatal in combination with alcohol and other depressants.[1] Mephenesin was used by Bernard Ludwig and Frank Berger to synthesize meprobamate, the first tranquilizer to see widespread clinical use. Mephenesin is no longer available in North America but is used in France, Italy and a few other countries.[2] Its use has largely been replaced by the related drug methocarbamol, which is better absorbed.[3]

Mephenesin may be an NMDA receptor antagonist.[4]

See also

External links

  • Bachmeyer C, Blum L, Fléchet M, Duriez P, Cabane J, Imbert J (1996). "[Severe contact dermatitis caused by mephenesin]". Ann Dermatol Venereol. 123 (3): 185–7. PMID 8761781.
  • Ono H, Nakamura T, Ito H, Oka J, Fukuda H (1987). "Rigidity in rats due to radio frequency decerebration and effects of chlorpromazine and mephenesin". Gen Pharmacol. 18 (1): 57–9. doi:10.1016/0306-3623(87)90170-4. PMID 3557053.


  1. ^ "Mephenesin". MIMS.
  2. ^ "Mephenesin".
  3. ^ Huf, Ernst; et al. "Comparative Plasma Levels of Mephenesin, Mephenesin Carbamate and Methocarbamol". Experimental Biology & Medicine. Retrieved 8 January 2014.
  4. ^ Keshavarz M, Showraki A, Emamghoreishi M (2013). "Anticonvulsant Effect of Guaifenesin against Pentylenetetrazol-Induced Seizure in Mice". Iran J Med Sci. 38 (2): 116–21. PMC 3700057. PMID 23825891.