Pharmacology Mechanism of action of nifedipine is: A It has a prominent smooth muscle relaxant action causes arteriolar dilation leading to fall in blood pressure B Nifedipine depresses the SA node thus decreasing myocardial excitability C Mainly depression of A-V conduction D Decrease cardiac output thus decreasing load on myocardium 💡 Explanation Mechanism of action of nifedipine is: ✓ Correct Answer: A. It has a prominent smooth muscle relaxant action causes arteriolar dilation leading to fall in blood pressure