Clinical data
AHFS/Drugs.comInternational Drug Names
Routes of
ATC code
Legal status
Legal status
  • BR: Class C1 (Other controlled substances)[1]
  • In general: ℞ (Prescription only)
Pharmacokinetic data
  • 2-[(4-butylsulfanylphenyl)-phenyl-methyl]sulfanyl-N,N-dimethylethanamine
CAS Number
PubChem CID
ECHA InfoCard100.006.936 Edit this at Wikidata
Chemical and physical data
Molar mass359.59 g·mol−1
3D model (JSmol)
  • S(c1ccc(cc1)C(SCCN(C)C)c2ccccc2)CCCC
  • InChI=1S/C21H29NS2/c1-4-5-16-23-20-13-11-19(12-14-20)21(24-17-15-22(2)3)18-9-7-6-8-10-18/h6-14,21H,4-5,15-17H2,1-3H3 checkY
 ☒NcheckY (what is this?)  (verify)

Captodiame (INN), also known as captodiamine, is an antihistamine sold under the trade names Covatine, Covatix, and Suvren which is used as a sedative and anxiolytic. The structure is related to diphenhydramine.[2]

A 2004 study suggested captodiame may be helpful in preventing benzodiazepine withdrawal syndrome in people discontinuing benzodiazepine treatment.[2]

In addition to its actions as an antihistamine, captodiamine has been found to act as a 5-HT2C receptor antagonist and σ1 receptor and D3 receptor agonist.[3] It produces antidepressant-like effects in rats.[3] However, captodiamine is unique among antidepressant-like drugs in that it increases brain-derived neurotrophic factor (BDNF) levels in the hypothalamus but not in the frontal cortex or hippocampus.[3] This unique action may be related to its ability to attenuate stress-induced anhedonia and corticotropin-releasing factor (CRF) signaling in the hypothalamus.[3]


The oxygen atom in these molecules can in many cases be dispensed with as well; substitution of sulfur for nitrogen affords a molecule whose salient biologic properties are those of a sedative and tranquilizer.

Captodiamine synthesis: Hubner Oluf Herman, Petersen Povl Viggo. U.S. patent 2,830,088 (1958).

Friedel-Crafts acylation of the n-butyl ether of thiophenol with benzoyl chloride gives the corresponding benzophenone. Reduction of the ketone with zinc/NaOH followed by treatment with HCl in ether affords the benzhydryl chloride. Displacement of the halogen with thiourea gives, by reaction of the last at its most nucleophilic center, the isothiouronium salt. Hydrolysis of the salt leads to the sulfur analog of a benzhydrol. Alkylation of the sodium salt of this last with N-(2-chloroethyl)dimethylamine affords captodiame.

See also


  1. ^ Anvisa (2023-03-31). "RDC Nº 784 - Listas de Substâncias Entorpecentes, Psicotrópicas, Precursoras e Outras sob Controle Especial" [Collegiate Board Resolution No. 784 - Lists of Narcotic, Psychotropic, Precursor, and Other Substances under Special Control] (in Brazilian Portuguese). Diário Oficial da União (published 2023-04-04). Archived from the original on 2023-08-03. Retrieved 2023-08-16.
  2. ^ a b Mercier-Guyon C, Chabannes JP, Saviuc P (2004). "The role of captodiamine in the withdrawal from long-term benzodiazepine treatment". Curr Med Res Opin. 20 (9): 1347–55. doi:10.1185/030079904125004457. PMID 15383182. S2CID 32561767. Free full text with registration
  3. ^ a b c d Ring RM, Regan CM (October 2013). "Captodiamine, a putative antidepressant, enhances hypothalamic BDNF expression in vivo by synergistic 5-HT2c receptor antagonism and sigma-1 receptor agonism". J. Psychopharmacol. (Oxford). 27 (10): 930–9. doi:10.1177/0269881113497614. hdl:10197/4383. PMID 23863923.