Home » Ortho Related » Medications » CYPROHEPTADINE/PERIACTIN CYPROHEPTADINE/PERIACTIN September 18, 2020July 22, 2020 by Data Trace Editor - for allergic reactions; - antihistamine, - antiserotonin; - Adult: 4mg PO tid, to maximum 0.5mg/kg/day; - Note: Anticholinergic side effects and drowsiness common