Correct Answer: D

Rationale: A therapeutic response to levothyroxine is indicated by a decrease in the level of TSH. This decrease signifies that the body requires less stimulation to produce thyroid hormone, reflecting a normalization of thyroid function due to the medication's effectiveness.

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: B

Rationale: The correct answer is B: 'Expect a persistent, dry cough.' Lisinopril, an ACE inhibitor, commonly causes a persistent, dry cough as a side effect. This should be reported to the healthcare provider if it becomes bothersome. It is essential for the nurse to educate the client about this potential side effect so the client is aware and can seek appropriate guidance if needed.

Correct Answer: A

Rationale: The correct answer is A. Grapefruit juice can increase blood levels of verapamil, leading to increased effects and potentially serious side effects such as hypotension or bradycardia. It is crucial for the client to avoid grapefruit juice while taking Verapamil to prevent these adverse reactions.

Correct Answer: D

Rationale: Metformin's primary pharmacological action is to decrease hepatic glucose production. By reducing hepatic glucose production, metformin helps to lower blood sugar levels and improve insulin sensitivity in the liver.