Clinical data
ATC code None
Legal status
Legal status
  • Non-regulated
CAS Number 92175-57-0
PubChem (CID) 123982
DrugBank DB08040
ChemSpider 110501
Chemical and physical data
Formula C14H18N2O5
Molar mass 294.303 g/mol
3D model (Jmol) Interactive image

Kelatorphan is a drug which acts as a powerful and complete inhibitor of nearly all of the enzymes responsible for catabolism of the endogenous enkephalins, including neutral endopeptidase (NEP), dipeptidyl peptidase III (DPP3), aminopeptidase N (APN), and angiotensin-converting enzyme (ACE).[1][2][3] In mice, with the intracerebroventricular co-administration of a 50 µg dose of kelatorphan (this route is necessary because kelatorphan is incapable of crossing the blood-brain-barrier)[4] hence alongside exogenous [Met]enkephalin (ED50 approximately 10 ng), it potentiated the analgesic effects of the latter by 50,000 times.[1] Kelatorphan also displays potent antinociceptive effects alone,[5] and does not depress respiration, although at high doses it actually increases it.[4]

See also


  1. 1 2 Fournie-Zaluski MC, Chaillet P, Bouboutou R, et al. (July 1984). "Analgesic effects of kelatorphan, a new highly potent inhibitor of multiple enkephalin degrading enzymes". European Journal of Pharmacology. 102 (3-4): 525–8. doi:10.1016/0014-2999(84)90575-2. PMID 6386492.
  2. Yamamoto Y, Ono H, Ueda A, Shimamura M, Nishimura K, Hazato T (December 2002). "Spinorphin as an endogenous inhibitor of enkephalin-degrading enzymes: roles in pain and inflammation". Current Protein & Peptide Science. 3 (6): 587–99. doi:10.2174/1389203023380404. PMID 12470213.
  3. P. A. van Zwieten; William J. Greenlee (5 September 1997). Antihypertensive Drugs. CRC Press. p. 192. ISBN 978-90-5702-122-0. Retrieved 25 November 2011.
  4. 1 2 Boudinot E, Morin-Surun M, Foutz AS, Fournié-Zaluski M, Roques BP, Denavit-Saubié M (February 2001). "Effects of the potent analgesic enkephalin-catabolizing enzyme inhibitors RB101 and kelatorphan on respiration". Pain. 90 (1-2): 7–13. doi:10.1016/S0304-3959(00)00382-1. PMID 11166965.
  5. Kayser V, Fournie-Zaluski MC, Guilbaud G, Roques BP (September 1989). "Potent antinociceptive effects of kelatorphan (a highly efficient inhibitor of multiple enkephalin-degrading enzymes) systemically administered in normal and arthritic rats". Brain Research. 497 (1): 94–101. doi:10.1016/0006-8993(89)90974-8. PMID 2790459.
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