Correct Answer: C

Rationale: Furosemide, a loop diuretic, can lead to hypokalemia by increasing the excretion of potassium in the urine. This potassium loss can result in lower-than-normal levels of potassium in the body, leading to hypokalemia.

Correct Answer: B

Rationale: When a client is prescribed Lithium, monitoring serum lithium levels is crucial to ensure they remain within the therapeutic range and to assess for potential toxicity. Monitoring serum lithium levels helps prevent adverse effects associated with lithium toxicity, such as nausea, vomiting, diarrhea, tremors, and confusion.

Correct Answer: B

Rationale: Isosorbide, an organic nitrate used for angina, is contraindicated with sildenafil due to the risk of fatal hypotension. Concurrent use of these medications can lead to severe hypotension. Patients are advised to avoid taking nitrate medications for 24 hours after using isosorbide to prevent this dangerous interaction.

Correct Answer: A

Rationale: Seizures are a potential adverse reaction following the administration of local anesthetics like Lidocaine. This adverse effect is important to monitor as it can be life-threatening and requires immediate intervention. It is crucial for the nurse to be vigilant in recognizing any signs of seizure activity to ensure the client's safety and well-being.

Correct Answer: C

Rationale: The nurse should monitor the client for neutropenia when receiving hydroxyurea, as it is a common adverse effect caused by bone marrow suppression. Neutropenia increases the risk of infections, making it crucial for the nurse to closely monitor the client's white blood cell count.