<prompt> The mechanism of action of Sodium nitroprusside isIncreased cAMPStimulation of guanylate cyclaseCalcium channel blockersPotassium channel blocker  <response>: Sodium nitroprusside acts by releasing nitric oxideNO. This stimulate guanylate cyclase and results in the elevation of cGMP, which are vasodilators. Refer kDT 6e p549 