Lansoprazol Flas Qualigen (Lansoprazole)

Lansoprazole is indicated for several acid‑related gastrointestinal conditions.

• Gastroesophageal reflux disease (GERD): alleviates heartburn and esophageal irritation by maintaining higher gastric pH.
• Erosive esophagitis: promotes healing of damaged esophageal lining and prevents further erosion.
• Peptic ulcer disease: supports ulcer healing and reduces risk of recurrence by suppressing acid secretion.
• Helicobacter pylori eradication (in combination therapy): enhances the effectiveness of antibiotic regimens by creating a less acidic environment.

• Lansoprazole irreversibly binds to the H+/K+ ATPase enzyme (the gastric proton pump) located on the secretory surface of parietal cells. By inhibiting this final step of acid production, it markedly reduces basal and stimulated gastric acid secretion, leading to an increase in gastric pH and allowing mucosal healing in acid‑related disorders. The inhibition persists until new enzyme molecules are synthesized, providing prolonged acid suppression with once‑daily dosing.

Lansoprazole may cause adverse reactions, which are generally classified as common or serious.

Common Side Effects

• Headache: mild to moderate pain in the head.
• Diarrhea: loose, watery stools.
• Nausea: feeling of sickness or urge to vomit.
• Abdominal pain: discomfort or cramping in the stomach area.

Serious or Rare Side Effects

• Clostridioides difficile infection: severe colitis presenting with watery diarrhea.
• Acute interstitial nephritis: kidney inflammation that may cause reduced urine output.
• Stevens‑Johnson syndrome: rare skin reaction with blistering and mucosal involvement.

Before prescribing lansoprazole, clinicians should consider several precautionary measures.

• Assess renal function: dose adjustment may be needed in severe impairment.
• Evaluate for hepatitis C infection: prolonged use can increase risk of liver enzyme elevations.
• Review concomitant medications: potential for reduced absorption of drugs requiring acidic pH.
• Monitor long‑term use: chronic therapy has been associated with vitamin B12 deficiency and bone fracture risk.
• Store at ambient temperature: keep below 25°C in the original container, protect from moisture and direct light.

Lansoprazole can interact with other medicines, affecting their efficacy or safety.

Major Interactions (Avoid)

• Antiretroviral protease inhibitors (e.g., atazanavir): reduced absorption leading to therapeutic failure.
• Antifungal agents (e.g., ketoconazole, itraconazole): decreased bioavailability and loss of antifungal effect.
• Clopidogrel: diminished activation, potentially reducing antiplatelet activity.

Moderate Interactions (Monitor Closely)

• Warfarin: possible increase in INR, requiring closer coagulation monitoring.
• Methotrexate (high dose): reduced renal clearance may raise toxicity risk.
• Digoxin: altered absorption may necessitate serum level checks.