Correct Answer: B

Rationale: The correct instruction when teaching a client about Clonidine is to expect to feel drowsy or lightheaded. Clonidine can cause these side effects, especially when starting the medication. The nurse should advise the client to avoid activities that require alertness until they understand how the medication affects them.

Correct Answer: D

Rationale: When administering an antiulcer agent, caution is warranted in patients with renal failure due to the potential impact on drug metabolism and excretion. Additionally, elderly patients may be more susceptible to adverse effects from antiulcer agents due to age-related physiological changes. Therefore, it is important to be more cautious when administering antiulcer agents to patients with renal failure and elderly patients.

Correct Answer: A

Rationale: The correct answer is bradycardia. Diltiazem, a calcium channel blocker, can lead to bradycardia as a side effect. Bradycardia should be reported immediately because it can result in serious cardiac complications, especially in a client with atrial fibrillation.

Correct Answer: D

Rationale: The correct instruction is not to stop taking Propranolol abruptly. Abrupt cessation can lead to rebound hypertension or other cardiac complications. It is essential for the client to taper off the medication gradually under the supervision and guidance of a healthcare provider to avoid adverse effects.

Correct Answer: A

Rationale: Ondansetron, an antiemetic, should be taken 30 minutes before chemotherapy to prevent nausea and vomiting. This timing allows the medication to be most effective in controlling chemotherapy-induced nausea and vomiting.