Correct Answer: B

Rationale: The client's symptoms of numbness, paresthesias, and tingling in the extremities indicate peripheral neuritis, a common side effect of isoniazid (INH). This condition can be managed by supplementing with pyridoxine (vitamin B6) to minimize the symptoms.

Correct Answer: C

Rationale: Megestrol acetate can increase the risk of thromboembolic events. Clients with a history of thrombophlebitis should not receive this medication due to the increased risk of thromboembolic events. Therefore, the nurse should contact the registered nurse if thrombophlebitis is documented in the client's history to ensure appropriate medication management.

Correct Answer: D

Rationale: Bleomycin, when administered intravenously, can lead to interstitial pneumonitis and potentially progress to pulmonary fibrosis. Therefore, pulmonary function studies are essential to monitor lung function and detect any early signs of pulmonary toxicity. Other tests, such as regular pulmonary assessments, should also be conducted to ensure the safety and well-being of the client.

Correct Answer: B

Rationale: When a client is prescribed codeine sulfate, it is essential to monitor bowel activity because this medication can lead to constipation. Therefore, monitoring bowel function is crucial to prevent or manage any potential gastrointestinal issues that may arise.

Correct Answer: A

Rationale: To assess the effectiveness of leflunomide (Arava), a medication used to treat rheumatoid arthritis, the nurse should inquire about joint pain. Joint pain is a common symptom of rheumatoid arthritis, and improvement in joint pain indicates the medication's effectiveness in managing the condition.