Omeprazole is a proton pump inhibitor (PPI) used to reduce the amount of acid produced in the stomach. It is widely prescribed for the treatment and prevention of acid-related gastrointestinal conditions such as gastro-oesophageal reflux disease (GERD), peptic ulcers, erosive oesophagitis, and Zollinger-Ellison syndrome. Omeprazole works by providing long-lasting suppression of gastric acid secretion, helping relieve symptoms such as heartburn, acid reflux, indigestion, and stomach pain, while also promoting healing of the stomach and oesophageal lining.

Omeprazole contains Omeprazole, a well-established acid-suppressing medicine that belongs to the proton pump inhibitor class. It is commonly used in adults and, in certain cases, children, to treat conditions caused by excessive stomach acid. Excess acid can damage the lining of the stomach, duodenum, or oesophagus, leading to pain, inflammation, ulcers, and bleeding.

Omeprazole works by blocking the proton pumps in the stomach lining that are responsible for releasing acid. By significantly reducing acid production, it allows irritated or damaged tissues to heal and helps prevent further injury. This makes Omeprazole effective not only for symptom relief but also for long-term disease control.

Omeprazole is frequently prescribed for acid reflux and heartburn, where stomach acid flows back into the oesophagus, causing a burning sensation and irritation. It is also used to treat gastric and duodenal ulcers, including ulcers caused by Helicobacter pylori (H. pylori) infection, where it is combined with antibiotics as part of eradication therapy. In addition, Omeprazole is used to prevent ulcers in people who need long-term treatment with non-steroidal anti-inflammatory drugs (NSAIDs).

For chronic conditions, Omeprazole may be used as long-term maintenance therapy under medical supervision. While it is generally well tolerated, prolonged use requires periodic review, as long-term acid suppression may be associated with nutrient deficiencies and other risks. When taken correctly and monitored appropriately, Omeprazole plays a vital role in improving digestive comfort, preventing complications, and enhancing quality of life.

Omeprazole is indicated for:

• Treatment of gastro-oesophageal reflux disease (GERD)
• Relief of heartburn and acid indigestion
• Healing and prevention of gastric (stomach) ulcers
• Healing and prevention of duodenal ulcers
• Part of combination therapy for H. pylori eradication
• Prevention of NSAID-induced ulcers
• Treatment of erosive oesophagitis
• Management of Zollinger-Ellison syndrome (excess acid production)

Powerful Acid Suppression:

Omeprazole provides sustained reduction in stomach acid, offering effective relief from pain, heartburn, and reflux symptoms.

Promotes Healing:

By lowering acid levels, it allows ulcers and inflamed tissue in the stomach and oesophagus to heal naturally.

Prevents Recurrence:

Long-term or maintenance therapy helps prevent relapse of ulcers and reflux symptoms.

Protects Against NSAID Damage:

Reduces the risk of ulcers and bleeding in patients taking long-term painkillers such as aspirin or ibuprofen.

Improves Quality of Life:

Effective symptom control leads to better sleep, improved appetite, and reduced discomfort in daily activities.

Most people tolerate Omeprazole well. Side effects, when they occur, are usually mild and temporary.

Common Side Effects

• Headache
• Abdominal pain
• Nausea or vomiting
• Diarrhoea
• Constipation
• Flatulence

Uncommon Side Effects

• Dizziness
• Rash or itching
• Fatigue
• Dry mouth

Rare but Serious Side Effects

• Seek medical help immediately if you experience the following symptoms:
• Severe allergic reactions (swelling, rash, breathing difficulty)
• Severe skin reactions (e.g., Stevens-Johnson syndrome)
• Signs of low magnesium (muscle cramps, irregular heartbeat, seizures)
• Persistent diarrhoea (possible Clostridioides difficile infection)

• Take Omeprazole exactly as prescribed by your doctor.
• Usually taken once daily, preferably in the morning before food.
• Swallow capsules or tablets whole with water.
• Do not crush or chew gastro-resistant formulations.
• Continue treatment for the full prescribed course, even if symptoms improve early.

Omeprazole works by reducing the production of stomach acid at its source. Unlike antacids that neutralise existing acid, Omeprazole acts directly on the acid-secreting cells of the stomach, providing long-lasting acid suppression.

• Targeted Action in the Stomach: Omeprazole is absorbed into the bloodstream and selectively concentrates in the parietal cells of the stomach lining, where gastric acid is produced.
• Proton Pump Inhibition: Once inside these cells, Omeprazole irreversibly inhibits the H⁺/K⁺-ATPase enzyme (proton pump), which is responsible for the final step of acid secretion into the stomach.
• Sustained Acid Suppression: By blocking the proton pump, Omeprazole significantly reduces both basal and stimulated gastric acid secretion for up to 24 hours, even after the drug has been cleared from the bloodstream.
• Healing and Symptom Relief: Lower acid levels reduce irritation and inflammation of the oesophagus, stomach, and duodenum, allowing ulcers and erosions to heal while relieving symptoms such as heartburn, pain, and acid reflux.

Enhanced Treatment Outcomes: The reduced acidic environment also improves the effectiveness of antibiotics used in Helicobacter pylori eradication, supporting complete ulcer healing and lowering the risk of recurrence.

• Take it at the same time every day for the best results.
• Do not stop suddenly without medical advice if used long term.
• Long-term users may need magnesium and vitamin B12 monitoring.
• Lifestyle changes greatly improve treatment outcomes.
• Seek medical advice if symptoms persist beyond 2-4 weeks.

• Store below 25°C in a dry place.
• Protect from moisture and direct sunlight.
• Keep out of reach of children.

• Food does not significantly reduce effectiveness, but taking before meals improves acid control.
• Avoid excessive spicy, fatty, or acidic foods that may worsen symptoms.

Clopidogrel (Antiplatelet medicine): Concomitant use with Omeprazole may reduce the activation and effectiveness of clopidogrel, potentially lowering its ability to prevent blood clots.

Warfarin (Anticoagulant): Omeprazole may increase the effect of warfarin, raising the risk of bleeding.

Phenytoin and Diazepam (Antiepileptic / Sedative medicines): Omeprazole can slow the breakdown of these medicines, leading to increased blood levels and a higher risk of side effects.

Digoxin (Cardiac glycoside): Omeprazole may increase digoxin absorption, particularly in elderly patients, increasing the risk of digoxin toxicity.

Methotrexate (Immunosuppressant / Chemotherapy agent): High-dose methotrexate used with Omeprazole may lead to delayed clearance and increased toxicity.

Ketoconazole, Itraconazole, and Other pH-Dependent Antifungals: Reduced stomach acidity caused by Omeprazole can decrease absorption and effectiveness of medicines that require an acidic environment.

Iron Salts and Vitamin B12: Long-term acid suppression may reduce absorption of iron and vitamin B12, potentially leading to deficiency with prolonged use.

Always inform your doctor of all medicines you are taking.

Use with caution in patients with:

• Severe liver disease
• History of low magnesium levels
• Osteoporosis (long-term use may increase fracture risk)
• Vitamin B12 deficiency

• Typical adult dose: 20-40 mg once daily
• Higher doses may be prescribed for severe conditions
• Dose and duration depend on the condition being treated

Overdose is uncommon. Symptoms may include confusion, drowsiness, blurred vision, rapid heartbeat, nausea, and sweating. Seek immediate medical attention.

Take the missed dose as soon as you remember. If it is close to the next dose, skip the missed one. Do not double the dose.