Nifedipine and beta-blocker are given together -
Ans. is 'b' i.e., To overcome increased sympathetic activity of Nifedipine b-Blocker is given along with Nifedipine because a) Reflex tachycardia (Increased sympathetic activity) caused due to Nifedipine, is prevented by b-blocker. b) b-blockers cause dilatation of coronary aeries by unopposed a-mediated vasoconstriction. Nifedipine causes coronary vasodilatation and opposes the spasm caused by b-blockers. The tendency of b-blocker to cause ventricular dilatation is counteracted by Nifedipine.