Correct Answer: B

Rationale: When a medication has a half-life, it refers to the time it takes for half of the dose to be eliminated from the bloodstream. This parameter is crucial in understanding the duration of action and dosing intervals for medications in clinical practice. Choice A is incorrect as the half-life is not about how long the medication lasts but about elimination from the body. Choice C is incorrect because the half-life is not about the peak effectiveness of the medicine. Choice D is incorrect as it does not accurately define the concept of half-life.

Correct Answer: C

Rationale: The correct instruction for a client starting metoprolol is to avoid sudden changes in position. Metoprolol can cause dizziness due to its blood pressure-lowering effects, increasing the risk of falls and injury. Instructing the client to change positions slowly helps prevent orthostatic hypotension and related adverse events. Checking the pulse before taking the medication (Choice A) is not typically necessary for metoprolol. Taking the medication with food (Choice B) is not required for absorption and can be taken with or without food. Monitoring blood pressure regularly (Choice D) is essential for clients taking metoprolol, but avoiding sudden changes in position is more critical to prevent dizziness and falls.

Correct Answer: D

Rationale: The correct answer is D: 'Report persistent diarrhea to your provider.' Erythromycin is known to cause Clostridium difficile-associated diarrhea, which can be severe. Instructing the client to report any persistent diarrhea to their healthcare provider promptly is crucial to prevent complications. Choices A, B, and C are incorrect. Taking Erythromycin with food is generally recommended to reduce stomach upset, but it is not the most critical instruction. Expecting urine to turn dark yellow is not a common side effect of Erythromycin. Taking Erythromycin with a full glass of milk is not necessary and may not be appropriate for all clients, especially those with lactose intolerance or dairy allergies.

Correct Answer: B

Rationale: Corrected Rationale: Hydralazine, a vasodilator, can cause reflex tachycardia, leading to an increased heart rate. This side effect should be reported to the healthcare provider to ensure appropriate management and monitoring of the client's condition. Choice A (Orthostatic hypotension) is incorrect as Hydralazine is more likely to cause reflex tachycardia than orthostatic hypotension. Choice C (Dark-colored urine) and Choice D (Persistent cough) are unrelated to the common side effects of Hydralazine and should not be the focus of monitoring for this medication.

Correct Answer: C

Rationale: Verapamil, a calcium channel blocker, can cause peripheral edema due to vasodilation. Clients should monitor for this adverse effect characterized by swelling in the extremities. Muscle pain (choice A) is not a common adverse effect of Verapamil. Dry cough (choice B) is more commonly associated with ACE inhibitors. Increased urination (choice D) is not a typical adverse effect of Verapamil. Therefore, the correct answer is monitoring for peripheral edema.