DSC screening for drug-excipient interactions of a polypharmaceutical capsule dosage form containing salicylamide, ascorbic acid, pyrilamine maleate, phenylephrine hydrochloride, lactose, colloidal silicon dioxide and sodium starchglycolate was performed. The results show the following: Ascorbic acid is incompatible with lactose and sodium starch glycolate. Salicylamide is incompatible with lactose. Pyrilamide maleate is incompatible with sodium starch gylcolate. Phenylephrine hydrochloride is incompatible with lactose. Lactose is incompatible with ascorbic acid, salicylamide, pyrilamine maleate and phenylephrine hydrochloride. Sodium starch glycolate is incompatible with ascorbic acid and pyrilamine maleate. No attempt was made to determine the nature of the interactions.