A young adult client is prescribed misoprostol to prevent gastric ulcers caused by frequent use of nonsteroidal anti-inflammatory agents for an autoimmune disorder. For which reason will the nurse question giving the client a dose of this medication?

A. Proton-pump inhibitor, an antibiotic, and bismuth salts: This combination is used in quadruple therapy, not triple therapy. Bismuth is typically included when patients fail first-line treatment or have contraindications to standard regimens.

B. Proton-pump inhibitor and two antibiotics: Triple therapy involves a proton-pump inhibitor (like omeprazole or lansoprazole) and two antibiotics, commonly clarithromycin and either amoxicillin or metronidazole. This regimen is designed to eradicate H. pylori and promote ulcer healing.

C. H2-receptor antagonist and two antibiotics: H2-receptor antagonists like ranitidine are not part of the standard triple therapy. They are less effective than PPIs in suppressing gastric acid and are not the preferred first-line treatment with antibiotics.

D. H2-receptor antagonist, proton-pump inhibitor, and an antibiotic: This combination is incorrect for triple therapy. Using both an H2-receptor antagonist and a PPI is redundant and not evidence-based. Triple therapy requires a PPI and two antibiotics, not one.

A. Request an order for liver function tests to evaluate for hepatotoxicity: Bismuth subsalicylate is not associated with hepatotoxicity, and a black tongue is not indicative of liver dysfunction. There is no need for liver enzyme testing based solely on tongue discoloration.

B. Withhold the drug, because this is a sign of bismuth overdose: A black tongue is not a sign of overdose but rather a known harmless side effect due to the interaction of bismuth with sulfur in the saliva. Discontinuation is not warranted.

C. Assess further for signs of gastrointestinal (GI) bleeding: Although bismuth can cause dark stools, which may resemble melena, a black tongue specifically is not an indication of GI bleeding. Unless there are other signs, further assessment is unnecessary here.

D. Reassure the patient that this is an expected side effect of this drug: Bismuth subsalicylate often causes temporary blackening of the tongue or stool due to its chemical composition. This effect is benign and reversible, and reassurance is the appropriate nursing response.