A client with peptic ulcer disease receives a new prescription for cimetidine. Which statement provided by the client requires additional instruction by the nurse?

A. Notify the healthcare provider of lethargy: Cimetidine can cause side effects such as confusion and lethargy, especially in the elderly or those with renal impairment. Reporting these symptoms to the healthcare provider is important for proper management and potential adjustment of treatment. B. Decrease cigarette use to a pack per day: This statement indicates a misunderstanding of the impact of smoking on peptic ulcer disease. Smoking can exacerbate ulcer symptoms and interfere with healing. The nurse should instruct the client to ideally quit smoking altogether rather than just reducing the amount. C. Monitor for any signs of sexual dysfunction: Cimetidine can cause sexual dysfunction, including decreased libido and erectile dysfunction. The client should be aware of this potential side effect and report any such issues to their healthcare provider for further evaluation and management. D. Take the medication an hour after antacids: Cimetidine should not be taken simultaneously with antacids as this can interfere with its absorption. Taking cimetidine an hour after antacids is a correct approach to avoid interaction and ensure effective medication action.