Paper I
Question
Nicorandil
Answer
- Nicorandil is an antianginal drug with a dual mechanism:
- Nitrate-like action: Releases nitric oxide → venodilatation → reduced preload
- K⁺ATP channel opener: Opens ATP-sensitive potassium channels in vascular smooth muscle → arteriolar dilatation → reduced afterload
- Also produces coronary vasodilatation, including of epicardial coronary arteries (useful in vasospastic angina)
- Uses: Prophylaxis and treatment of angina pectoris (stable and vasospastic)
- Adverse effects: Headache, flushing, oral and GI ulceration, hypotension
- Unlike conventional nitrates, tolerance develops less readily

