Omeprazol (Omeprazole)

Omeprazole 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.
• Peptic ulcer disease: supports ulcer healing and reduces recurrence risk.
• Zollinger‑Ellison syndrome: controls gastric acid hypersecretion associated with gastrin‑producing tumors.
• Helicobacter pylori eradication regimens (as part of combination therapy): enhances eradication rates when used with antibiotics.
• NSA‑induced gastropathy prophylaxis: reduces risk of ulcer formation in patients requiring long‑term NSAID therapy.

• Omeprazole 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 lowers gastric acidity, allowing mucosal healing and providing symptom relief in acid‑related disorders.

Adverse reactions to omeprazole vary in frequency and severity.

Common Side Effects

• Headache: mild to moderate intensity.
• Diarrhoea: usually self‑limiting.
• Nausea or vomiting: occasional gastrointestinal upset.
• Abdominal pain or flatulence: mild discomfort.
• Constipation: infrequent but reported.
• Dry mouth: occasional sensation of oral dryness.

Serious or Rare Side Effects

• Clostridioides difficile infection: severe colitis in vulnerable patients.
• Hypomagnesemia: low serum magnesium with prolonged use.
• Acute interstitial nephritis: renal inflammation presenting with impaired function.
• Stevens‑Johnson syndrome/toxic epidermal necrolysis: severe skin reactions.
• Liver enzyme elevation: signs of hepatic stress.
• Fracture risk: increased incidence of hip, wrist or spine fractures with long‑term therapy.

When using omeprazole, consider the following safety measures:

• Assess renal and hepatic function: adjust use in severe impairment.
• Review long‑term therapy need: limit duration when possible to reduce risk of nutrient deficiencies.
• Monitor for infections: be alert to signs of gastrointestinal infections such as C. difficile.
• Evaluate bone health: consider calcium and vitamin D supplementation for patients at fracture risk.
• Pregnancy and lactation: use only if clearly needed after risk‑benefit assessment.
• Store at ambient temperature: keep in the original container, protect from moisture and direct sunlight.

Omeprazole may interact with several medicines, altering their effectiveness or safety.

Major Interactions (Avoid)

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