Clinical data
Trade namesTorecan, Norzine
AHFS/Drugs.comMicromedex Detailed Consumer Information
ATC code
Pharmacokinetic data
Protein binding60%
  • 2-(ethylthio)-10-[3-(4-methylpiperazin-1-yl)propyl]-10H-phenothiazine
CAS Number
PubChem CID
CompTox Dashboard (EPA)
ECHA InfoCard100.014.381 Edit this at Wikidata
Chemical and physical data
Molar mass399.62 g·mol−1
3D model (JSmol)
  • S(c2cc1N(c3c(Sc1cc2)cccc3)CCCN4CCN(C)CC4)CC
  • InChI=1S/C22H29N3S2/c1-3-26-18-9-10-22-20(17-18)25(19-7-4-5-8-21(19)27-22)12-6-11-24-15-13-23(2)14-16-24/h4-5,7-10,17H,3,6,11-16H2,1-2H3 checkY

Thiethylperazine (Torecan, Norzine) is an antiemetic[1] of the phenothiazine class. It is an antagonist of dopamine receptors (DRD1, DRD2, DRD4) as well as of 5-HT2A, 5-HT2C receptors, mAChRs (1 through 5), α1 adrenergic receptor and H1 receptor.

Thiethylperazine activates the transport protein ABCC1 that clears beta-amyloid from brains of mice.[2]




This drug is highly lipofilic and it binds with membranes and serum proteins (over 85%). It accumulates in organs with high blood flow and penetrates the placenta. It cannot be removed with dialysis.


It is mainly metabolised in the liver and only 3% is eliminated unchanged. Torecan's half-life is 12 h.


In toxic doses above the terapeutic window, it increases the rate of cleft palate occurrence.

Antipsychotic activity

Theithylperazine may possess antipsychotic activity[4] due to the antagonism of 5-HT2 and D2 receptors. It can cause extrapyramidal symptoms.[citation needed] Nevertheless, it was never marketed as an antipsychotic.

One cause of acute dystonia occurred in a 19-year-old male patient after discontinuation of this drug.[5]


Signs of acute thiethylperazine overdose include: extrapyramidal symptoms, confusion, convulsions, respiratory depression and hypotension.


Thieme Synthesis:[6][7] Patent:[8]

Goldberg reaction between 3-(ethylsulfanyl)aniline [1783-82-0] (1) and 2-chlorobenzoic acid [118-91-2] (2) to give the diarylamine, CID:82254530 (3). The carboxyl in the anthranilic acid residue, having performed its activating function, is then thermolytically removed to form [68083-49-8] (4). Upon treatment with sulfur and iodine, we get predominantly the phenothiazine [46815-10-5] (5); The rxn may well be aided by the presence of the electron donating thioether at the para-position. Alkylation with 1-(ɣ̞-chloropropyl)-4-methylpiperazine [104-16-5] (6) in the presence of sodamide affords Thiethylperazine (7).


  1. ^ Tamboline BL, Mcgillivray DC, Bogoch A (February 1965). "The Effects of Thiethylperazine Dimaleate (Torecan) on Nausea and Vomiting". Canadian Medical Association Journal. 92 (8): 422–423. PMC 1928133. PMID 14261157.
  2. ^ Krohn M, Lange C, Hofrichter J, Scheffler K, Stenzel J, Steffen J, et al. (October 2011). "Cerebral amyloid-β proteostasis is regulated by the membrane transport protein ABCC1 in mice". The Journal of Clinical Investigation. 121 (10): 3924–3931. doi:10.1172/JCI57867. PMC 3195473. PMID 21881209.
  3. ^ "Charakterystyka Produktu Leczniczego". (in Polish). Archived from the original on October 20, 2022. Retrieved 14 May 2023.
  4. ^ Rotrosen J, Angrist BM, Gershon S, Aronson M, Gruen P, Sachar EJ, et al. (September 1978). "Thiethylperazine; clinical antipsychotic efficacy and correlation with potency in predictive systems". Archives of General Psychiatry. 35 (9): 1112–1118. doi:10.1001/archpsyc.1978.01770330086008. PMID 99115.
  5. ^ Khanderia U (July 1985). "Recurrent dystonic reactions induced by thiethylperazine". Drug Intelligence & Clinical Pharmacy. 19 (7–8): 550–551. doi:10.1177/106002808501900708. PMID 4028959. S2CID 44453678.
  6. ^ Bourquin JP, Schwarb G, Gamboni G, Fischer R, Ruesch L, Guldimann S, et al. (1958). "Synthesen auf dem Phenothiazin-Gebiet. 1. Mitteilung. Mercaptophenothiazin-Derivate". Helvetica Chimica Acta. 41 (4): 1061–1072. doi:10.1002/hlca.19580410419.
  7. ^ Bourquin JP, Schwarb G, Gamboni G, Fischer R, Ruesch L, Guldimann S, et al. (1958). "Synthesen auf dem Phenothiazin-Gebiet. 2. Mitteilung. N-substituierte Mercaptophenothiazin-Derivate". Helvetica Chimica Acta. 41 (4): 1072–1108. doi:10.1002/hlca.19580410420.
  8. ^ US 3336197, Jany R, Bourquin jP, Gamboni G, Schwarb G, issued 1967, assigned to Sandoz KK.