Correct Answer: A

Rationale: The correct answer is to instruct the client to monitor their heart rate daily when taking verapamil. Verapamil is a calcium channel blocker that can cause bradycardia, making it crucial to monitor the heart rate regularly to detect any changes promptly. Choice B, taking the medication at bedtime, is not specifically related to verapamil administration. Choice C, avoiding grapefruit juice, is more relevant to medications metabolized by CYP3A4 enzymes, not verapamil. Choice D, taking the medication with food, is not a specific instruction for verapamil, as it can be taken with or without food.

Correct Answer: B

Rationale: The correct instruction for a client prescribed phenytoin is to avoid consuming dairy products. Dairy products can reduce the absorption of phenytoin. Taking the medication with a full glass of water (Choice A) is generally a good practice for oral medications but is not specifically required for phenytoin. Taking the medication on an empty stomach (Choice C) can lead to gastrointestinal upset, so it is not recommended for phenytoin. Expecting a metallic taste in the mouth (Choice D) is a possible side effect of phenytoin but is not a crucial instruction for the client to follow.

Correct Answer: A

Rationale: The correct answer is to instruct the client to monitor their heart rate daily when taking verapamil. Verapamil is a calcium channel blocker that can cause bradycardia, making it crucial to monitor the heart rate regularly to detect any changes promptly. Choice B, taking the medication at bedtime, is not specifically related to verapamil administration. Choice C, avoiding grapefruit juice, is more relevant to medications metabolized by CYP3A4 enzymes, not verapamil. Choice D, taking the medication with food, is not a specific instruction for verapamil, as it can be taken with or without food.

Correct Answer: D

Rationale: The correct instruction to include in the discharge teaching for a client with a new prescription for nitroglycerin is to take the medication at the first sign of chest pain. Nitroglycerin is a vasodilator that helps relax blood vessels, increasing blood flow to the heart muscle and reducing the workload of the heart. Taking it at the onset of chest pain helps alleviate angina symptoms quickly and effectively. Storing the medication in a cool, dark place (Choice A) is not a critical instruction for this medication. Taking the medication at bedtime (Choice B) or on an empty stomach (Choice C) is not relevant to the administration of nitroglycerin for angina relief.

Correct Answer: D

Rationale: The correct instruction for a client with a new prescription for nitroglycerin is to take the medication at the first sign of chest pain. Nitroglycerin is a vasodilator used to relieve chest pain associated with angina. Taking it at the onset of chest pain ensures prompt relief by dilating blood vessels and increasing blood flow to the heart muscle. Storing nitroglycerin in a cool, dark place helps maintain its potency, while taking it with food can alter its absorption. Timing the medication with bedtime is not necessary, but prompt administration at the first sign of chest pain is crucial for effective management of angina. Choices A, B, and C are incorrect because storing the medication in a cool, dark place, taking it before bedtime, and taking it with food are not essential instructions for nitroglycerin use. The priority is to administer it promptly when chest pain occurs to achieve optimal therapeutic effects.