Final answer:
The best time for the nurse to administer bisacodyl (Ducolax) tablets to a patient receiving cholestyramine (Questran) and complaining of constipation is four hours after administration of cholestyramine (Questran).
Step-by-step explanation:
The best time for the nurse to administer bisacodyl (Ducolax) tablets to a patient receiving cholestyramine (Questran) and complaining of constipation is four hours after administration of cholestyramine (Questran). This is because bisacodyl is a stimulant laxative that helps promote bowel movements, which can counteract the constipation caused by cholestyramine. Giving bisacodyl four hours after cholestyramine allows enough time for the latter to work while minimizing any potential interactions between the two medications.