Correct Answer: D

Rationale: Conjugated equine estrogens are contraindicated in individuals with a history of thrombophlebitis due to the increased risk of thrombotic events associated with estrogen use. Thrombophlebitis is a condition characterized by inflammation and blood clot formation in the veins, and estrogen therapy can exacerbate this condition, leading to serious complications such as deep vein thrombosis. Therefore, caution is advised when considering estrogen therapy in clients with a history of thrombophlebitis to prevent adverse outcomes.

Correct Answer: A

Rationale: To minimize the adverse effect of photophobia associated with Clomipramine, the client should be advised to wear sunglasses when outdoors. Clomipramine is a tricyclic antidepressant (TCA) known to cause anticholinergic effects like photophobia, which can be reduced by protecting the eyes with sunglasses when exposed to bright light.

Correct Answer: B

Rationale: The correct instruction for a client with a new prescription for Simvastatin is to avoid drinking grapefruit juice. Grapefruit juice can inhibit the metabolism of Simvastatin, leading to increased blood levels of the drug and a higher risk of adverse effects such as muscle pain and liver damage. It is important to educate the client about this potential interaction to ensure the safe and effective use of the medication.

Correct Answer: D

Rationale: Acarbose can cause liver toxicity when taken long-term. Liver function tests should be monitored periodically while the client takes this medication.

Correct Answer: A

Rationale: St. John's wort can reduce the effectiveness of Warfarin by interacting with its metabolism pathways, potentially leading to decreased anticoagulant effects. Therefore, clients on Warfarin therapy should avoid St. John's wort. While echinacea, garlic, and ginseng are also herbal supplements that can interact with Warfarin, St. John's wort is particularly known for its significant impact on Warfarin metabolism.