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chemical structure
Clinical data
Other names14-Methoxymetopon
CAS Number
PubChem CID
Chemical and physical data
Molar mass329.396 g·mol−1
3D model (JSmol)
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14-Methoxymetopon is an experimental opioid drug developed by a team led by Professor Helmut Schmidhammer at the University of Insbruck in the mid 1990s.[1] It is a derivative of metopon in which a methoxy group has been inserted at the 14-position. It is a highly potent analgesic drug that is around 500 times stronger than morphine when administered systemically; however, when given spinally or supraspinally, it exhibits analgesic activity up to a million fold greater than morphine.[2] It binds strongly to the μ-opioid receptor and activates it to a greater extent than most similar opioid drugs.[3] This produces an unusual pharmacological profile, and although 14-methoxymetopon acts as a potent μ-opioid full agonist in regard to some effects such as analgesia, a ceiling effect is seen on other effects such as constipation and respiratory depression which is believed to involve interaction with the κ-opioid receptor[4]

See also


  1. ^ US 5886001, "Agonist compounds" 
  2. ^ King, MA; Su, W; Nielan, CL; Chang, AH; Schütz, J; Schmidhammer, H; Pasternak, GW (2003). "14-Methoxymetopon, a very potent mu-opioid receptor-selective analgesic with an unusual pharmacological profile". European Journal of Pharmacology. 459 (2–3): 203–9. doi:10.1016/S0014-2999(02)02821-2. PMID 12524147.
  3. ^ Mahurter, L; Garceau, C; Marino, J; Schmidhammer, H; Tóth, G; Pasternak, GW (2006). "Separation of binding affinity and intrinsic activity of the potent mu-opioid 14-methoxymetopon". The Journal of Pharmacology and Experimental Therapeutics. 319 (1): 247–53. doi:10.1124/jpet.106.105395. PMID 16801454.
  4. ^ Freye, E; Schmidhammer, H; Latasch, L (2000). "14-methoxymetopon, a potent opioid, induces no respiratory depression, less sedation, and less bradycardia than sufentanil in the dog". Anesthesia and Analgesia. 90 (6): 1359–64. doi:10.1097/00000539-200006000-00018. PMID 10825321.