A nurse is teaching a client who has a new prescription for cimetidine to treat peptic ulcer disease. Which of the following statements by the client indicates an understanding of the teaching? (Select all that apply)

Choice A reason: Cimetidine, an H2 receptor antagonist, reduces gastric acid secretion and is taken regularly to prevent ulcer recurrence, not as needed for pain. PRN dosing is ineffective for maintaining consistent acid suppression, which is necessary for ulcer healing and preventing acid-related damage to the gastric mucosa. Choice B reason: Black stools typically indicate gastrointestinal bleeding, often due to ulcer perforation, not a normal effect of cimetidine. Cimetidine reduces acid to promote ulcer healing, preventing bleeding. Black stools require urgent evaluation, as they suggest melena, potentially from hemoglobin oxidation in the digestive tract. Choice C reason: Cimetidine’s absorption is minimally affected by food, allowing administration with or without meals. This flexibility ensures consistent acid suppression, as it blocks histamine receptors on parietal cells, reducing hydrochloric acid production, which promotes ulcer healing and symptom relief regardless of meal timing. Choice D reason: Eating five small meals reduces gastric acid demand and prevents stomach distension, which can exacerbate ulcers. This dietary approach minimizes acid secretion spikes, allowing cimetidine to maintain a stable gastric pH, promoting mucosal healing and reducing irritation from excessive acid exposure. Choice E reason: Taking cimetidine with antacids can reduce its absorption, as antacids alter gastric pH, potentially decreasing bioavailability. Cimetidine’s acid suppression is sufficient alone, and concurrent antacid use may interfere with its pharmacokinetics, reducing efficacy in treating peptic ulcer disease.