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CAS Number
PubChem CID
Chemical and physical data
Formula C16H21NO2
Molar mass 259.3434 g/mol
3D model (Jmol)

Nortilidine[1] is the major active metabolite of tilidine. It is formed from tilidine by demethylation in the liver. The racemate has opioid analgesic effects roughly equivalent in potency to that of morphine[2] but virtually all of the opioid activity resides in the (1S,2R) isomer.[3] The (1R,2S) isomer has NMDA antagonist activity. The drug also acts as a dopamine reuptake inhibitor.[4] The reversed-ester of nortilidine is also known[5] which has almost identical properties to nortilidine.[6]

See also[edit]


  1. ^ US Patent 3792080 - Process for Substituted Cyclohexenes its Products
  2. ^ J Clin Pharmacol. 2002 Nov ;42 (11):1257-61 - Sequential first-pass metabolism of nortilidine: the active metabolite of the synthetic opioid drug tilidine
  3. ^ Opiates: George R. Lenz page 439, Table 9-30 (78)
  4. ^ Schifano, Fabrizio; Orsolini, Laura; Duccio Papanti, G.; Corkery, John M. (2015). "Novel psychoactive substances of interest for psychiatry". World Psychiatry. 14 (1): 15–26. ISSN 1723-8617. doi:10.1002/wps.20174. 
  5. ^ US Patent 4291059 - Cycloaromatic compounds, analgesic Properties thereof and Method of use thereof as analgesic
  6. ^ Personal Communication with Derek P. Reynolds