Nifedipine (chemical name: dimethyl 2,6-dimethyl-4-(2-nitrophenyl)-1,4-dihydropyridine-3,5-dicarboxylate) possesses outstanding vasodilating activity, especially cardiovasodilating effect, and hypotensive activity and is thus utilized widely as a vasodilating agent and a hypotensive medicament clinically for the remedy of angina pectoris and hypertension.