About omeprazol
Proton pump inhibitor
Used for
- Gastro-oesophageal reflux and heartburn
- Stomach or duodenal ulcers
- H. pylori infection, with other medicines
- Preventing ulcers linked to anti-inflammatory medicines
Usual adult dose
Usually 20 mg once daily; dose and duration vary by condition.
Usual dose in children
For children aged 1 year and older, usually 10–20 mg once daily; specialist dosing depends on weight and condition.
Common side effects
- Headache
- Abdominal pain, nausea, or diarrhoea
- Constipation or wind
- Long-term use may lower magnesium or vitamin B12
Important warnings
- Seek assessment for trouble swallowing, vomiting blood, black stools, or unexplained weight loss.
- Long-term use may increase fracture and certain infection risks.
- May mask symptoms of stomach cancer.
- Dose adjustment or monitoring may be needed with liver disease.
Pregnancy
Generally considered usable when needed; discuss risks and benefits with a healthcare professional.
Breastfeeding
Small amounts may enter milk; use depends on clinical need and professional guidance.
Interactions
- Clopidogrel: omeprazole may reduce its effect.
- Warfarin: may alter blood-thinning effect; monitoring may be needed.
- Some HIV medicines, such as nelfinavir, should not be combined.
- May affect medicines including methotrexate, digoxin, and phenytoin.
AI-generated from general medical knowledge, not from this product's official leaflet. It may be incomplete or out of date. Not medical advice — ask a pharmacist or doctor before making any decision.