<prompt> All of the following drugs reduce afterload, except:EnalaprilPropranololHydralazineSodium nitroprusside  <response>: Ref:KDT 6e p504 Afterloadis reduced by the drugs having aerioler dilating propey. Propanolol is a non-selective beta-blocker. It can cause vasoconstriction by antagonizing beta2 mediated vasodilation. It, therefore do not decrease afterload. 