Omeprazol Tartet Ciclum Farma Unipessoal (Omeprazole)

Omeprazole acts on the gastric proton pump to manage acid‑related disorders.

• Gastro‑esophageal reflux disease (GERD): provides symptomatic relief and promotes healing of esophageal erosion.
• Peptic ulcer disease: supports ulcer healing by maintaining a less acidic gastric environment.
• Zollinger‑Ellison syndrome: controls excessive gastric acid secretion associated with the condition.
• Helicobacter pylori eradication regimens: used as adjunct therapy to improve eradication rates when combined with antibiotics.
• NSAID‑induced gastropathy: helps prevent ulcer formation in patients requiring long‑term NSAID therapy.

• Omeprazole selectively and irreversibly inhibits the H+/K+‑ATPase enzyme (the gastric proton pump) located on the parietal cell secretory canaliculi. 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 disorders.

Adverse reactions to omeprazole are generally mild and dose‑dependent.

Common Side Effects

• Headache: mild to moderate intensity.
• Diarrhea: watery stools, often transient.
• Nausea: occasional feeling of stomach upset.
• Abdominal pain: cramping or discomfort.
• Flatulence: increased gas production.
• Constipation: reduced bowel movements.

Serious or Rare Side Effects

• Clostridioides difficile infection: severe colitis presenting with watery diarrhea.
• Acute interstitial nephritis: renal inflammation with possible decreased urine output.
• Hypomagnesemia: low serum magnesium causing muscle cramps or arrhythmias.
• Stevens‑Johnson syndrome: severe skin and mucosal reactions.
• Liver enzyme elevation: increased ALT/AST indicating hepatic stress.
• Bone fracture risk: potential reduction in calcium absorption with long‑term use.

When prescribing omeprazole, clinicians should consider several safety aspects.

• Assess renal function: adjust use in severe renal impairment.
• Evaluate hepatic status: use with caution in moderate to severe liver disease.
• Review concomitant medications: potential for drug‑drug interactions.
• Monitor long‑term therapy: consider periodic assessment of magnesium and vitamin B12 levels.
• Pregnancy and lactation: weigh benefits against potential risks.
• Store at ambient temperature: keep in the original container, protect from moisture and direct sunlight.

Omeprazole may alter the pharmacokinetics of several co‑administered drugs.

Major Interactions (Avoid)

• Clopidogrel: reduced antiplatelet effect, may increase cardiovascular risk.
• Atazanavir: decreased absorption, loss of antiviral efficacy.
• Methotrexate (high dose): increased serum concentrations, risk of toxicity.

Moderate Interactions (Monitor Closely)

• Warfarin: potential increase in INR, monitor coagulation parameters.
• Digoxin: possible rise in serum levels, observe for toxicity signs.
• Diazepam: enhanced sedation, adjust dose if needed.
• Ketoconazole: reduced absorption, consider alternative antifungal.
• Iron salts: decreased iron uptake, separate administration times.