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: C

Rationale: Liver failure impairs metabolism, leading to increased medication concentrations. To prevent adverse effects, lower dosages are required when liver function is compromised.

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: B

Rationale: The correct answer is to monitor blood pressure regularly. Hydralazine is an antihypertensive medication that helps lower blood pressure. Monitoring blood pressure regularly is essential to ensure it remains within the target range and to assess the effectiveness of the medication.

Correct Answer: B

Rationale: The correct answer is B. Visual disturbances, such as blurred vision or seeing halos, can be a sign of digoxin toxicity. It is crucial for the client to report any changes in vision to their healthcare provider promptly to prevent serious complications.