A nurse is teaching a 49-year-old male client who has been newly prescribed cimetidine (Tagamet HB) for the management of peptic ulcer disease. Which of the following statements should the nurse include in the teaching?

A. "This medication may cause increased libido." This is incorrect. Cimetidine (Tagamet) can cause side effects such as decreased libido, especially in men. This occurs because the drug inhibits the action of certain hormones, leading to sexual dysfunction. B. "You may take this medication with antacids to prevent stomach upset." This is incorrect. Cimetidine should not be taken with antacids because antacids can reduce its absorption and effectiveness. It is advised to space the administration of cimetidine and antacids by at least 1 hour. C. "This medication will neutralize your stomach acid." This is incorrect. Cimetidine works by blocking histamine receptors (H2 receptors), which reduces the production of stomach acid but does not neutralize it. D. "This medication may cause decreased libido." This is correct. One of the side effects of cimetidine is reduced libido, particularly in male clients, due to its anti-androgenic effects.