Omeprazol Capsules Laboratorios Liconsa, S.A. (Omeprazole)

Omeprazole is a proton pump inhibitor that acts on the gastric parietal cell to lower acid production, making it useful for several acid‑related conditions.

• Gastro‑oesophageal reflux disease (GERD): provides symptomatic relief and promotes healing of esophageal erosion.
• Peptic ulcer disease: accelerates ulcer healing and reduces the risk of recurrence.
• Zollinger‑Ellison syndrome: controls excessive gastric acid secretion associated with the condition.

• Omeprazole selectively and irreversibly inhibits the H+/K+‑ATPase enzyme (the gastric proton pump) located on the secretory surface of gastric parietal cells. By blocking this final step of acid secretion, it markedly reduces both basal and stimulated gastric acidity, allowing mucosal healing and symptom control in acid‑related gastrointestinal disorders.

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

Common Side Effects

• Headache: mild to moderate intensity.
• Abdominal pain: discomfort in the upper abdomen.
• Diarrhea: loose stools occurring intermittently.
• Nausea: feeling of queasiness.
• Flatulence: increased intestinal gas.
• Constipation: reduced bowel movements.

Serious or Rare Side Effects

• Anaphylaxis: severe allergic reaction requiring immediate medical attention.
• Clostridioides difficile infection: severe colitis associated with antibiotic‑like effects.
• Stevens‑Johnson syndrome: rare skin disorder with blistering.
• Elevated liver enzymes: indication of hepatic stress.
• Hypomagnesemia: low serum magnesium levels.
• Interstitial nephritis: inflammation of kidney interstitium.

Before initiating therapy, consider the following safety measures.

• Renal function assessment: adjust use in patients with severe impairment.
• Hepatic function evaluation: use with caution in liver disease.
• Concomitant medication review: assess for drugs requiring acidic pH for absorption.
• Long‑term use monitoring: watch for bone fracture risk and vitamin B12 deficiency.
• Pregnancy and lactation: prescribe only if potential benefit outweighs risk.
• Store at ambient temperature: keep in the original container, protect from moisture and light.

Omeprazole can affect the pharmacokinetics of several medicines.

Major Interactions (Avoid)

• Clopidogrel: reduced antiplatelet activity.
• Atazanavir: decreased absorption of both agents.
• High‑dose methotrexate: increased toxicity risk.
• HIV protease inhibitors (e.g., ritonavir): diminished antiviral effect.
• Warfarin: unpredictable changes in INR.

Moderate Interactions (Monitor Closely)

• Digoxin: potential increase in serum concentration.
• Diazepam: enhanced sedative effect.
• Ketoconazole: reduced antifungal absorption.
• Iron salts: decreased iron uptake.
• Calcium carbonate: may lower omeprazole efficacy.