Sildenafil is inhibitor of_______________?
Correct answer: C. PDE-5
- A. cAMP
- B. cGMP
- C. PDE-5
- D. PGI2
Explanation
Sildenafil selectively inhibits phosphodiesterase-5, preventing cGMP breakdown and thereby prolonging smooth-muscle relaxation. It does not inhibit cGMP itself; rather, it increases cGMP levels.
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