Which statement made by a client taking an H2-receptor blocker for peptic ulcer disease leads the nurse to suspect the client needs additional teaching regarding this class of drugs?

H2-receptor antagonists, such as famotidine or ranitidine, competitively inhibit histamine binding on parietal cells to reduce basal acid secretion. While generally well-tolerated, they can occasionally cause central nervous system effects or blood dyscrasias. Long-term use of these medications is not traditionally associated with the calcium malabsorption issues seen with other acid-suppressing classes. A. "I will report any unusual bleeding or signs of infection.": Rare side effects of H2-blockers include thrombocytopenia and leukopenia, necessitating monitoring for hematological changes. This statement demonstrates correct understanding of the need to report potential bone marrow suppression. It is a valid safety precaution for patients on this therapy. B. "This type of drug may cause dizziness.": Central nervous system side effects, including dizziness, confusion, or headaches, are documented adverse reactions to H2-receptor blockers, especially in geriatric populations. The client correctly identifies a common side effect that requires caution during daily activities. This indicates proper teaching has occurred. C. "This drug may cause osteoporosis.": Osteoporosis and increased fracture risk are specifically associated with long-term proton pump inhibitor use, not H2-blockers. PPIs interfere with the acidic environment needed for calcium absorption, whereas H2-blockers have a milder effect. This statement indicates the client is confusing these drug classes. D. "I will avoid smoking while taking this drug.": Nicotine stimulates gastric acid secretion and interferes with the therapeutic efficacy of H2-receptor antagonists. Smoking significantly delays ulcer healing and increases the rate of recurrence. The client’s intention to cease smoking shows a clear understanding of the treatment plan.