Antihypertensive compositions containing an aryl-substituted alanine azo and an arylhydrazino-propionic acid

A pharmaceutical composition for treating hypertension comprising

• (A) a compound having the formula:
• ##STR6## wherein R.sub.1 and R.sub.2 may be hydrogen or alkyl of from 1 to 4 carbon atoms, and R.sub.3 is a substituted benzene ring having the formula:
• ##STR7## wherein Y.sub.1 is hydrogen, cyanoamino, carboxyl, cyano, thiocarbamoyl, aminomethyl, guanidino, hydroxy, methanesulfonamido, nitro, amino, methanesulfonyloxy, carboxymethoxy, formyl or methoxy and Y.sub.2 is a substituted or unsubstituted 5-membered heterocyclic ring containing one or more nitrogen, atoms, and pharmaceutically acceptable salts and hydrates thereof, and
• (B) a decarboxylase inhibitor having the formula:
• ##STR8## wherein R.sub.4, R.sub.5, R.sub.6 and R.sub.7 are independently hydrogen or C.sub.1 -C.sub.4 alkyl, and pharmaceutically acceptable salts thereof wherein the weight ration of (A):(B) is about 10:1 to about 1:100.