A client has an order to receive the histamine receptor antagonist: Cimetidine. What potential adverse effects should be mentioned in client teaching?

A. Impotence.: Cimetidine, an H2 receptor antagonist, can cause endocrine-related adverse effects such as impotence, decreased libido, and gynecomastia in men. Cimetidine can block androgen receptors and increase prolactin levels, altering normal hormonal balance. B. Hair growth.: Cimetidine does not promote hair growth. Excessive hair growth (hirsutism) is unrelated to H2 blockers and is more commonly associated with hormonal imbalances or specific endocrine disorders rather than this medication. C. Priapism.: Prolonged, painful erection (priapism) is not a known side effect of cimetidine. It is more often associated with certain psychiatric medications or erectile dysfunction drugs that affect vascular blood flow. D. Hypersecretion of stomach acid.: Cimetidine decreases, not increases, gastric acid production by blocking histamine receptors in the stomach lining. It is used to treat peptic ulcer disease, GERD, and gastritis by reducing acid secretion and promoting mucosal healing.