Which of the following drugs causes constipation?: (A) Propanolol, (B) Verapamil, (C) Nitroglycerin, (D) Captopril
Answer is B. It is a Calcium channel blocker. DOC for chronic PSVT Organic (secondary) constipation due to drugs causes e.g.-opiates, sedatives, anticholinergics including antiparkinsonian, antidepressants and antihistaminics, oral iron, clonidine, verapamil. (REF. ESSENTIALS OF MEDICAL PHARMACOLOGY K.D TRIPATHI-6th edition.Page No-530)