Lansoprazol Aristo (Lansoprazole)

Lansoprazole acts on the gastric proton pump to lower acid production, making it useful for several acid‑related gastrointestinal conditions.

• Gastro‑esophageal reflux disease (GERD): reduces acid exposure, relieving heartburn and esophageal irritation.
• Peptic ulcer disease: promotes ulcer healing by maintaining a less acidic gastric environment.
• NSAID‑induced gastric ulcer: provides gastro‑protective effect when patients require non‑steroidal anti‑inflammatory therapy.
• Helicobacter pylori eradication (in combination therapy): enhances the efficacy of antibiotic regimens by creating a higher pH that improves bacterial susceptibility.

• Lansoprazole selectively and irreversibly binds to the cysteine‑SH group of the H+/K+ ATPase enzyme, also known as the gastric proton pump, located on the secretory surface of parietal cells. By inhibiting this final step of acid secretion, it markedly reduces both basal and stimulated gastric acid output, leading to an increased gastric pH. The inhibition persists until new enzyme molecules are synthesized, providing prolonged acid suppression with once‑daily dosing.

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

Common Side Effects

• Headache: mild to moderate headache reported.
• Diarrhea: loose stools or increased bowel movements.
• Abdominal pain: discomfort or cramping in the stomach area.
• Nausea: feeling of queasiness or urge to vomit.

Serious or Rare Side Effects

• Severe allergic reaction (anaphylaxis): hives, swelling, difficulty breathing.
• Clostridioides difficile infection: severe diarrhea with abdominal pain and fever.
• Low magnesium levels (hypomagnesemia): muscle weakness, irregular heartbeat, seizures.

When prescribing lansoprazole, clinicians should consider several precautionary measures to ensure safe use.

• Assess renal function: adjust use in patients with severe kidney impairment.
• Monitor magnesium: prolonged therapy may deplete magnesium, requiring periodic testing.
• Evaluate infection risk: use cautiously in patients with a history of C. difficile infection.
• Use with caution in the elderly: increased susceptibility to fractures and nutrient deficiencies.
• Review concomitant medications: potential interactions may affect drug efficacy.
• Store at ambient temperature: keep below 25°C in the original container, protected from moisture.

Lansoprazole can affect the pharmacokinetics of several medicines, leading to clinically relevant interactions.

Major Interactions (Avoid)

• Ketoconazole: reduced absorption and efficacy when taken together.
• Atazanavir: markedly decreased antiviral activity due to increased gastric pH.
• Clopidogrel: diminished antiplatelet effect from impaired activation.

Moderate Interactions (Monitor Closely)

• Antacids (containing aluminum or magnesium): may decrease lansoprazole absorption; separate dosing by at least 2 hours.
• Digoxin: increased serum concentrations; monitor levels and adjust dose if needed.