Pantoprazole Sandoz Ltd (Pantoprazole)

Pantoprazole is a proton pump inhibitor that acts on the gastric acid secretion pathway. It is indicated for several acid‑related disorders:

• Gastro‑oesophageal reflux disease (GERD): alleviates heartburn and promotes healing of erosive esophagitis.
• Erosive esophagitis: heals damage to the oesophageal lining caused by chronic acid exposure.
• Zollinger‑Ellison syndrome: controls excessive gastric acid production associated with gastrin‑secreting tumours.
• Peptic ulcer disease (duodenal and gastric ulcers): supports ulcer healing and reduces recurrence risk.

• Pantoprazole selectively inhibits the H+/K+‑ATPase enzyme (the gastric proton pump) located on the secretory surface of parietal cells. By binding covalently to the pump’s cysteine residues, it blocks the final step of acid secretion, leading to a sustained increase in gastric pH and reduced acidity in the stomach.

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

Common Side Effects

• Headache: mild to moderate intensity.
• Diarrhoea: usually transient.
• Nausea: occasional and mild.
• Abdominal pain: mild discomfort.
• Flatulence: increased gas production.
• Constipation: occasional bowel habit change.

Serious or Rare Side Effects

• Clostridioides difficile infection: severe colitis presenting with watery diarrhoea.
• Acute interstitial nephritis: renal inflammation with reduced urine output.
• Severe allergic reaction (anaphylaxis): rash, swelling, airway compromise.
• Low magnesium levels (hypomagnesemia): muscle cramps, arrhythmia risk.
• Bone fractures: increased risk with long‑term use.
• Liver enzyme elevation: transaminase rise indicating hepatic stress.

Before initiating therapy, consider the following safety measures:

• Assess renal function: dose adjustment may be required in severe impairment.
• Review hepatic status: use with caution in moderate to severe liver disease.
• Evaluate concomitant medications: potential for drug‑drug interactions.
• Monitor long‑term use: periodic assessment of bone health and magnesium levels is advised.
• Pregnancy and lactation: weigh benefits against potential risks; consult a healthcare professional.
• Store at ambient temperature: keep below 25°C, retain in original packaging, and protect from moisture.

Pantoprazole may affect the pharmacokinetics of several co‑administered drugs.

Major Interactions (Avoid)

• Antifungal agents (ketoconazole, itraconazole): reduced absorption due to higher gastric pH.
• HIV protease inhibitors (atazanavir, nelfinavir): decreased plasma concentrations.
• Clopidogrel: diminished antiplatelet effect, increasing cardiovascular risk.

Moderate Interactions (Monitor Closely)

• Warfarin: possible increase in INR; monitor coagulation parameters.
• Digoxin: modest rise in serum levels; assess for toxicity.
• Methotrexate (high dose): impaired renal clearance; monitor renal function and drug levels.