Cyproheptadine (pronounced /ˌsaɪprɵˈhɛptədiːn/; usually as cyproheptadine hydrochloride, trade name Periactin or Toractin) is an antihistaminic/anticholinergic andantiserotonergic agent. It acts as a 5-HT2 receptor antagonist as well and also blocks calcium channels.[1]