Pantoprazole Kalceks (Pantoprazole)

Pantoprazole Kalceks is a proton pump inhibitor that acts on the gastric acid secretion pathway.

• Gastro‑oesophageal reflux disease (GERD): provides symptomatic relief of heartburn and promotes healing of erosive esophagitis.
• Erosive gastritis: facilitates mucosal healing by reducing gastric acidity.
• Zollinger‑Ellison syndrome: controls excessive gastric acid secretion associated with gastrin‑producing tumours.

• 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 reduction of gastric acidity.

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

Common Side Effects

• Headache: mild to moderate intensity.
• Diarrhoea: usually self‑limiting.
• Nausea: occasional and transient.
• Abdominal pain: mild discomfort.
• Flatulence: excess gas.
• Constipation: infrequent.

Serious or Rare Side Effects

• Severe allergic reaction (anaphylaxis): requires immediate medical attention.
• Clostridioides difficile infection: may present with persistent diarrhoea.
• Low magnesium levels (hypomagnesemia): can cause muscle cramps or cardiac arrhythmia.
• Bone fractures: associated with long‑term use.
• Liver enzyme elevation: indicates possible hepatic stress.

Before initiating therapy, consider the following safety points:

• Assess renal function: dose adjustment may be needed in severe impairment.
• Evaluate hepatic status: use with caution in moderate to severe liver disease.
• Review concomitant medications: potential for drug‑drug interactions.
• Monitor long‑term use: assess need for ongoing therapy after 12 months.
• Pregnancy and lactation: weigh benefits against potential risks.
• Store at below 25°C: keep in the original packaging, protect from moisture and direct sunlight.

Pantoprazole may interact with several medicines; clinical relevance varies.

Major Interactions (Avoid)

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

Moderate Interactions (Monitor Closely)

• Warfarin: possible alteration of INR values.
• Methotrexate: increased serum levels, especially at high doses.
• Digoxin: modest increase in serum concentration.
• Oral contraceptives: slight reduction in efficacy.