<prompt> Which one of the following drugs causes constipation?PropranololVerapamilNitroglycerinCaptopril  <response>: Ans. is b i.e., Verapamil Drugs causing constipation : Aluminium Hydroxide Ion exchange resins Verapamil Calcium carbonate Barium sulphate Opiates Ferrous sulphate Ganglionic blockers Phenothiazines Tricyclic antidepresants 