Abstract: Compositions for treating hypertension comprising an effective amount of a dihydropyridine of the formula ##STR1## in which X is 1 or 2 identical or different substituents from the group consisting of nitro, chlorine and trifluoromethyl, or together with the phenyl ring, the group ##STR2## R.sup.1 is alkyl of 1 to 4 C atoms, which is optionally substituted by alkoxy of 1 to 4 C atoms,R.sup.2 is alkyl of 1 to 12 C atoms, which is optionally substituted by alkoxy of 1 to 3 C atoms, fluorine or N-methyl-N-benzylamino andR.sup.3 is alkyl of 1 to 4 C atoms, cyano or hydroxymethyl, and a pyridazodiazepine of the formula ##STR3## in which R.sup.4 is aralkyl,R.sup.5 is hydrogen or alkyl of 1 to 8 C atoms,R.sup.6 is hydrogen or alkyl of 1 to 8 C atoms andR.sup.7 and R.sup.8 are hydrogen, or together, an oxo group, are described.