Omeprazol Cf (Omeprazole)

Omeprazole is a proton pump inhibitor that reduces gastric acid production, making it useful for several acid‑related gastrointestinal conditions.

• Gastro‑oesophageal reflux disease (GERD): alleviates heartburn and regurgitation by maintaining a higher gastric pH.
• Erosive esophagitis: promotes healing of acid‑induced esophageal lesions.
• Peptic ulcer disease: supports ulcer healing and prevents recurrence.
• Helicobacter pylori eradication (as part of combination therapy): enhances antibiotic effectiveness by reducing gastric acidity.
• Zollinger‑Ellison syndrome: controls excessive gastric acid secretion associated with gastrin‑producing tumors.

• Omeprazole irreversibly binds to the cysteine‑residue of the H+/K+‑ATPase enzyme (the gastric proton pump) located on the secretory surface of parietal cells. This inhibition blocks the final step of acid secretion, leading to a sustained increase in gastric pH and reduction of both basal and stimulated gastric acid output.

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

Common Side Effects

• Headache: mild to moderate intensity, often transient.
• Abdominal pain: discomfort or cramping in the upper abdomen.
• Nausea: feeling of queasiness without vomiting.
• Diarrhea: loose stools occurring intermittently.
• Flatulence: increased intestinal gas.
• Constipation: reduced bowel movements.

Serious or Rare Side Effects

• Anaphylaxis: severe allergic reaction with rash, swelling, and breathing difficulty.
• Clostridioides difficile infection: severe colitis presenting with watery diarrhea.
• Hypomagnesemia: low serum magnesium causing muscle cramps or arrhythmia.
• Vitamin B12 deficiency: long‑term use may impair absorption.
• Stevens‑Johnson syndrome: rare skin blistering disorder.
• Bone fractures: increased risk with prolonged therapy.

Before initiating therapy, consider the following safety measures.

• Assess renal function: dose adjustment may be required in severe impairment.
• Monitor hepatic status: use with caution in patients with liver disease.
• Limit duration: avoid long‑term use without medical supervision.
• Review concomitant antiplatelet therapy: increased bleeding risk may occur.
• Pregnancy and lactation: use only if clearly needed after risk‑benefit evaluation.
• Store at room temperature: keep in the original pack, protect from moisture and direct sunlight.

Omeprazole can affect the pharmacokinetics of several medicines.

Major Interactions (Avoid)

• Clopidogrel: reduced antiplatelet effect, increasing cardiovascular risk.
• Atorvastatin: increased statin exposure, raising risk of myopathy.
• Methotrexate: elevated plasma levels, potentially causing toxicity.
• Warfarin: variable INR changes, requiring close monitoring.

Moderate Interactions (Monitor Closely)

• Digoxin: decreased absorption, may reduce therapeutic effect.
• Diazepam: increased serum concentrations, leading to enhanced sedation.
• Ketoconazole: reduced absorption, compromising antifungal efficacy.