A nurse is providing discharge teaching to a client with peptic ulcer disease who has a new prescription for cimetidine. Which of the following statements by the client indicates a need for further teaching?

A) Take the medication an hour after antacids: This statement reflects proper understanding, as antacids can interfere with the absorption of cimetidine. The client should ideally wait at least an hour after taking antacids before taking cimetidine. B) Monitor for any signs of sexual dysfunction: This is a relevant concern with cimetidine, as it can cause sexual side effects, indicating the client understands the potential adverse effects of the medication. C) Notify the healthcare provider of lethargy: This statement is appropriate because lethargy can indicate potential serious side effects or complications, especially with a new medication, suggesting the client understands the need for monitoring side effects. D) Decrease cigarette use to a pack per day: This statement requires additional instruction. Smoking can exacerbate peptic ulcer disease, and the client should be encouraged to quit or significantly reduce smoking, not just decrease it to a pack per day.