Lansoprazole Accord (Lansoprazole)

Lansoprazole is a proton pump inhibitor that reduces gastric acid secretion in several acid‑related conditions.

• Gastro‑oesophageal reflux disease (GERD): relieves heartburn and promotes healing of the esophageal lining.
• Erosive esophagitis: decreases acid exposure to allow mucosal repair.
• Peptic ulcer disease: supports ulcer healing and prevents recurrence.
• Helicobacter pylori eradication therapy: enhances the effectiveness of antibiotic regimens.
• Zollinger‑Ellison syndrome: controls excessive gastric acid production caused by gastrin‑secreting tumors.

• Lansoprazole selectively and irreversibly inhibits the H+/K+ ATPase enzyme (the gastric proton pump) located on the secretory surface of parietal cells. By blocking this final step of acid secretion, it markedly reduces both basal and stimulated gastric acid output, leading to an increase in gastric pH and facilitating healing of acid‑related lesions.

Lansoprazole may cause a range of adverse reactions, from mild to severe.

Common Side Effects

• Headache: mild to moderate pain often transient.
• Diarrhea: loose stools that may be self‑limiting.
• Nausea: feeling of unease or urge to vomit.
• Abdominal pain: discomfort in the stomach area.

Serious or Rare Side Effects

• Severe allergic reaction (anaphylaxis): swelling, difficulty breathing, rash.
• Clostridioides difficile infection: severe colitis with watery diarrhea.
• Liver enzyme elevation: signs of hepatic stress.
• Low magnesium levels (hypomagnesemia): muscle cramps, irregular heartbeat.
• Stevens‑Johnson syndrome: severe skin blistering.
• Interstitial nephritis: kidney inflammation presenting with reduced urine output.

Before prescribing Lansoprazole, clinicians should consider several safety aspects.

• Assess renal function: adjust use in patients with severe renal impairment.
• Monitor bone health: long‑term therapy may affect calcium absorption and increase fracture risk.
• Avoid in known hypersensitivity: discontinue if rash or angioedema occurs.
• Use caution with warfarin: may potentiate anticoagulant effect and raise INR.
• Store at room temperature: keep in the original container, protect from moisture and direct sunlight.

Lansoprazole can affect the pharmacokinetics of several co‑administered medicines.

Major Interactions (Avoid)

• Ketoconazole: reduced absorption and efficacy.
• Atazanavir: decreased plasma concentrations.
• Clopidogrel: diminished activation leading to reduced antiplatelet effect.

Moderate Interactions (Monitor Closely)

• Warfarin: possible increase in INR, requiring closer monitoring.
• Digoxin: may raise serum levels, risking toxicity.
• Methotrexate: potential for increased toxicity, especially at high doses.