A nurse is teaching a client who has a duodenal ulcer about his new prescription for cimetidine. The nurse should include which of the following instructions in the teaching?

A. "You should plan to take this medication for at least 6 months.": The duration of treatment depends on the severity of the ulcer and the client's individual response to therapy. Typically, the course of treatment is 4 – 6 weeks, and it should be guided by the healthcare provider. B. "Your doctor might need to reduce your theophylline dose while taking this medication.": Cimetidine can inhibit the metabolism of theophylline, leading to increased levels of theophylline in the blood. The healthcare provider may need to adjust the theophylline dose to prevent toxicity. C. "Take the medication on an empty stomach for better absorption.": Cimetidine can be taken with or without food. Taking it with food can sometimes help reduce the gastrointestinal side effects. It does not necessarily require an empty stomach for better absorption. D. "Take the medication with an antacid to minimize stomach upset.": Antacids should not be taken at the same time as cimetidine, as they can interfere with its absorption. Cimetidine should be taken separately (1- 2 hrs) from antacids to ensure its effectiveness.