Correct Answer: A

Rationale: St. John's wort should be avoided by clients taking Warfarin as it can reduce the medication's effectiveness by interacting with its metabolism. While garlic and ginseng are also known to interact with Warfarin, the specific supplement the nurse should instruct the client to avoid in this scenario is St. John's wort.

Correct Answer: A

Rationale: The correct instruction the nurse should provide is to rinse the mouth after each use of Beclomethasone. This practice helps reduce the risk of developing oral fungal infections associated with inhaled corticosteroids.

Correct Answer: D

Rationale: The correct answer is 'Orthostatic hypotension.' Amitriptyline can lead to orthostatic hypotension, a sudden drop in blood pressure when standing up, which can cause dizziness and increase the risk of falls. It is crucial for the nurse to monitor the client for signs of orthostatic hypotension, such as dizziness or lightheadedness when changing positions, and to educate the client to move slowly when transitioning from lying or sitting to standing.

Correct Answer: A

Rationale: The correct answer is A: Dyspnea. Dyspnea can indicate pulmonary toxicity, a severe adverse effect of trastuzumab. It is crucial for the client to report any breathing difficulties promptly to ensure timely intervention and prevent further complications.

Correct Answer: C

Rationale: The correct way to administer eye drops is by instructing the client to drop the prescribed amount of medication into the center of the conjunctival sac. This technique helps in proper distribution and absorption of the medication.