Nillar (Esomeprazole Magnesium)

Esomeprazole magnesium is a proton pump inhibitor indicated for several acid‑related gastrointestinal disorders.

• Gastro‑oesophageal reflux disease (GERD): alleviates heartburn and promotes healing of esophageal irritation.
• Erosive oesophagitis: reduces acid exposure to allow mucosal recovery.
• NSAID‑induced gastric ulcer: protects the gastric lining by lowering acid secretion.
• Zollinger‑Ellison syndrome: controls excessive gastric acid production.
• Helicobacter pylori eradication (as part of combination therapy): enhances the effectiveness of antibiotic regimens by creating a less acidic environment.

• Esomeprazole magnesium 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 secretion, it markedly reduces both basal and stimulated gastric acid output, leading to increased gastric pH and relief of acid‑related symptoms.

Common side effects are generally mild and transient.

Common Side Effects

• Headache: mild to moderate intensity.
• Diarrhea: loose stools occurring intermittently.
• Nausea: occasional feeling of queasiness.
• Abdominal pain: mild discomfort in the stomach area.
• Flatulence: increased intestinal gas.
• Constipation: reduced bowel movements.

Serious or Rare Side Effects

• Severe allergic reactions: rash, swelling, or difficulty breathing.
• Clostridioides difficile infection: persistent watery diarrhea.
• Low serum magnesium: muscle cramps or irregular heartbeat.
• Bone fracture risk: especially with long‑term use.
• Acute interstitial nephritis: kidney inflammation presenting with fever and rash.
• Stevens‑Johnson syndrome: severe skin blistering and mucosal involvement.

Before initiating therapy, consider the following precautions.

• Renal function assessment: adjust use in severe renal impairment.
• Hepatic impairment: use with caution in patients with liver disease.
• Magnesium monitoring: check levels during prolonged treatment.
• Long‑term use: evaluate risk‑benefit for chronic therapy.
• Drug‑interaction review: assess concomitant medications that may affect acid levels.
• Store at room temperature: keep in the original container, protect from moisture and direct sunlight.

Esomeprazole magnesium can alter the absorption or metabolism of several drugs.

Major Interactions (Avoid)

• Ketoconazole: reduced antifungal efficacy due to decreased absorption.
• Atazanavir: markedly lowered antiviral concentrations.
• Clopidogrel: diminished antiplatelet activation.

Moderate Interactions (Monitor Closely)

• Digoxin: increased serum levels requiring dose adjustment.
• Methotrexate: potential for elevated toxicity, especially at high doses.
• HIV protease inhibitors (e.g., ritonavir): altered plasma concentrations.
• Phenytoin: possible reduction in antiepileptic effect.
• Fluconazole: may increase esomeprazole exposure.