Ciclazindol (WY-23,409) is an antidepressant and anorectic drug of the tetracyclic chemical class that was developed in the mid to late 1970s, but was never marketed.[2][3] It acts as a norepinephrine reuptake inhibitor, and to a lesser extent as a dopamine reuptake inhibitor.[2][4] Ciclazindol has no effects on the SERT, 5-HT receptors, mACh receptors, or α-adrenergic receptors, and has only weak affinity for the H1 receptor.[4][5][6] As suggested by its local anesthetic properties,[5] ciclazindol may also inhibit sodium channels. It is known to block potassium channels as well.[7][8]

Clinical data
Routes of
ATC code
  • none
Pharmacokinetic data
Elimination half-life~32 hours[1]
ExcretionUrine, feces[1]
CAS Number
PubChem CID
Chemical and physical data
Molar mass298.77 g/mol g·mol−1
3D model (JSmol)

See also


  1. Swaisland AJ, Franklin RA, Southgate PJ, Coleman AJ (February 1977). "The pharmacokinetics of ciclazindol (Wy 23409) in human volunteers". British Journal of Clinical Pharmacology. 4 (1): 61–5. doi:10.1111/j.1365-2125.1977.tb00668.x. PMC 1428987. PMID 843425.
  2. Ghose K, Rama Rao VA, Bailey J, Coppen A (April 1978). "Antidepressant activity and pharmacological interactions of ciclazindol". Psychopharmacology. 57 (1): 109–14. doi:10.1007/BF00426966. PMID 96461.
  3. Levine S (1979). "A controlled comparative trial of a new antidepressant, ciclazindol". The Journal of International Medical Research. 7 (1): 1–6. PMID 369921.
  4. Oh VM, Ehsanullah RS, Leighton M, Kirby MJ (January 1979). "Influence of ciclazindol on monoamine uptake and CNS function in normal subjects". Psychopharmacology. 60 (2): 177–81. doi:10.1007/BF00432290. PMID 106428.
  5. Waterfall JF, Smith MA, Gaston WH, Maher J, Warburton G (July 1979). "Cardiovascular and autonomic actions of ciclazindol and tricyclic antidepressants". Archives Internationales de Pharmacodynamie et de Thérapie. 240 (1): 116–36. PMID 507990.
  6. Gardner CR, Wilford AE (January 1980). "The effects of mianserine, amitriptyline, ciclazindol and viloxazine on presynaptic alpha-receptors in isolated rat atria [proceedings]". British Journal of Pharmacology. 68 (1): 184P–185P. doi:10.1111/j.1476-5381.1980.tb10705.x. PMC 2044122. PMID 6244029.
  7. Noack T, Edwards G, Deitmer P, et al. (May 1992). "The involvement of potassium channels in the action of ciclazindol in rat portal vein". British Journal of Pharmacology. 106 (1): 17–24. doi:10.1111/j.1476-5381.1992.tb14286.x. PMC 1907450. PMID 1504725.
  8. Lee K, Khan RN, Rowe IC, et al. (April 1996). "Ciclazindol inhibits ATP-sensitive K+ channels and stimulates insulin secretion in CR1-G1 insulin-secreting cells". Molecular Pharmacology. 49 (4): 715–20. PMID 8609901.

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