The mechanism of action of Sodium nitroprusside is: (A) Increased cAMP, (B) Stimulation of guanylate cyclase, (C) Calcium channel blockers, (D) Potassium channel blocker
Answer is B. Sodium nitroprusside acts by releasing nitric oxide(NO). This stimulate guanylate cyclase and results in the elevation of cGMP, which are vasodilators. Refer kDT 6/e p549