C. Antihypertensive Drugs Calcium channel blockers Nifedipine硝苯地平 1. Pharmacologicaleffects D Relaxing vascular smooth muscles 2. Clinicaluses I Mild to severe hypertension(usually combined with B receptor blockersCalcium channel blockers 1. Pharmacological effects Relaxing vascular smooth muscles 2. Clinical uses Mild to severe hypertension (usually combined with  receptor blockers ) C. Antihypertensive Drugs Nifedipine 硝苯地平