Omeprazol Rompharm (Omeprazole)

Omeprazole is a proton pump inhibitor used to manage acid‑related gastrointestinal conditions.

• Gastroesophageal reflux disease (GERD): reduces reflux symptoms and promotes healing of esophageal irritation.
• Peptic ulcer disease: facilitates ulcer healing by decreasing gastric acidity.
• NSAID‑induced gastric ulcer: protects the gastric mucosa from ulceration associated with non‑steroidal anti‑inflammatory drugs.
• Helicobacter pylori eradication (in combination therapy): enhances the effectiveness of antibiotic regimens by creating a less acidic environment.

• Omeprazole exerts its effect by irreversibly binding to the cysteine residues of the gastric H+/K+ ATPase enzyme, commonly called the proton pump, located on the secretory surface of parietal cells. This inhibition blocks the final step of acid production, leading to a prolonged reduction in gastric hydrogen ion secretion and an increase in gastric pH. The inhibition is sustained until new enzyme molecules are synthesized, providing acid suppression for up to 72 hours after a single dose.

Omeprazole may be associated with a range of adverse reactions, varying from mild to severe.

Common Side Effects

• Headache: mild, transient pain in the head.
• Diarrhea: loose stools that may be self‑limiting.
• Nausea: feeling of sickness or urge to vomit.
• Abdominal pain: discomfort in the stomach area.
• Flatulence: increased intestinal gas.
• Constipation: difficulty passing stools.

Serious or Rare Side Effects

• Severe allergic reaction: rash, itching, swelling, or difficulty breathing.
• Clostridioides difficile infection: severe diarrhea and colitis.
• Low magnesium levels: muscle cramps, irregular heartbeat.
• Liver enzyme elevation: signs of hepatic stress.
• Stevens‑Johnson syndrome: blistering skin and mucosal lesions.
• Interstitial nephritis: kidney inflammation presenting with fever and rash.

When prescribing omeprazole, clinicians should consider several safety precautions to minimize risks.

• Assess renal function: adjust use in patients with severe renal impairment.
• Monitor for infection: prolonged therapy may increase risk of Clostridioides difficile infection.
• Check magnesium levels: long‑term treatment can cause hypomagnesemia.
• Avoid abrupt discontinuation: sudden stop may lead to rebound acid hypersecretion.
• Store at room temperature: keep in the original container, protect from moisture and heat.

Omeprazole can affect the pharmacokinetics of several co‑administered medicines, requiring attention to potential interactions.

Major Interactions (Avoid)

• Ketoconazole: reduced absorption and efficacy.
• Atazanavir: decreased antiviral plasma concentrations.
• Clopidogrel: impaired conversion to active metabolite.

Moderate Interactions (Monitor Closely)

• Warfarin: possible increase in INR and bleeding risk.
• Digoxin: elevated serum levels may occur.
• Methotrexate: increased toxicity with high‑dose regimens.