Pantoprazole Amarox (Pantoprazole)

Pantoprazole is a proton pump inhibitor indicated for several acid‑related gastrointestinal conditions.

• Gastro‑oesophageal reflux disease (GERD): provides relief of heartburn and promotes healing of the oesophageal lining.
• Erosive oesophagitis: accelerates mucosal healing and reduces symptom recurrence.
• Zollinger‑Ellison syndrome: controls excessive gastric acid secretion associated with gastrin‑producing tumours.
• Prevention of NSAID‑induced gastric ulcers: lowers the risk of ulcer formation in patients requiring long‑term NSAID therapy.

• Pantoprazole selectively and irreversibly binds to the H+/K+‑ATPase enzyme (the gastric proton pump) on the secretory surface of parietal cells, inhibiting the final step of acid secretion. By blocking this pump, it markedly reduces gastric acidity, allowing damaged mucosa to heal and decreasing the stimulus for acid‑related symptoms.

Pantoprazole is generally well tolerated, but adverse reactions can occur.

Common Side Effects

• Headache: mild to moderate intensity.
• Diarrhoea: watery stools, usually transient.
• Abdominal pain: discomfort in the upper abdomen.
• Nausea: feeling of unease or urge to vomit.
• Flatulence: increased intestinal gas.
• Constipation: reduced bowel movements.

Serious or Rare Side Effects

• Severe allergic reactions: including anaphylaxis or Stevens‑Johnson syndrome.
• Clostridioides difficile infection: colitis presenting with severe diarrhoea.
• Hypomagnesemia: low serum magnesium with prolonged use.
• Elevated liver enzymes: indicating possible hepatic stress.
• Acute pancreatitis: inflammation of the pancreas.
• Increased risk of bone fractures: with long‑term high‑dose therapy.

When prescribing Pantoprazole, consider the following safety measures.

• Assess renal and hepatic function: adjust use if impairment is present.
• Use cautiously in elderly patients: monitor for increased sensitivity to side effects.
• Monitor magnesium levels: especially during prolonged therapy.
• Avoid concomitant use with drugs that require acidic pH for absorption unless advised.
• Evaluate for CYP2C19 polymorphism: poor metabolizers may have higher drug exposure.
• Store at room temperature: keep in the original pack, protect from moisture.

Pantoprazole may affect the pharmacokinetics of several medicines.

Major Interactions (Avoid)

• Clopidogrel: reduced conversion to its active metabolite, decreasing antiplatelet effect.
• Atazanavir: decreased absorption leading to sub‑therapeutic antiviral levels.
• HIV protease inhibitors (e.g., nelfinavir): lowered plasma concentrations, compromising efficacy.

Moderate Interactions (Monitor Closely)

• Digoxin: increased serum levels, risk of toxicity.
• Phenytoin: reduced clearance, may raise phenytoin concentrations.
• Rifampin: induces metabolism, potentially lowering pantoprazole exposure.