Experimental studies were conducted to investigate for the effect of Mahaengkamsuk-tang on analgesic, antipyretic, antiinflammatory, secretion of respiratory tract, isolated ileum. Mahaengkamsuk-tang was composed of Ephedrae Herba, Armenicae Semen, Glycyrrhizae Radix, Gypsum Fibrosum. The following results has been obtained; analgesic and antipyretic actions were obtained. Anti-inflammatory effects in the paw edema induced by 1% dextran was significantly shown in rats. Spontaneous motilities of isolated ileum of mice were strongly suppressed, and contractions of isolated ileum of mice induced by acetylcholine chloride, barium chloride and histamine were remarkably inhibited. Expectorant effect was shown in rabbits. Continuous hypotensive action was seen.