Correct Answer: A

Rationale: Metformin should be taken with meals to reduce gastrointestinal side effects and ensure better absorption. Instructing the client to take the medication with the first bite of food helps in achieving optimal effectiveness and minimizes the risk of side effects like nausea or upset stomach.

Correct Answer: C

Rationale: The correct action for the provider is to withhold morphine if the client's respiratory rate is 12/min or less. Respiratory depression is a serious side effect of morphine and other opioids. Withholding the medication and informing the healthcare provider is essential to prevent further respiratory compromise in the client.

Correct Answer: D

Rationale: The correct answer is the 32-year-old man who has essential hypertension. Individuals who did not receive two doses of the varicella vaccine earlier in life should be immunized. Essential hypertension is not a contraindication for this vaccine, making it safe to administer to this client.

Correct Answer: B

Rationale: Clopidogrel is an antiplatelet medication that works by preventing blood clots. Monitoring the patient's platelet count is essential because a decrease in platelet count can increase the risk of bleeding. By assessing the platelet count, the healthcare professional can detect any potential adverse effects related to the medication and take appropriate actions to prevent complications.

Correct Answer: B

Rationale: Diltiazem is a calcium channel blocker that can lead to bradycardia as an adverse effect due to its negative chronotropic and dromotropic effects on the heart. The nurse should monitor the client's heart rate regularly to detect any signs of bradycardia and take appropriate actions if necessary.