Written & medically reviewed by Dr. Sanjay Anbu, MBBS· Last reviewed
Omeprazole is a proton-pump inhibitor (PPI) that lowers stomach acid to treat acidity, reflux and ulcers. It is one of the most used stomach medicines worldwide.
Typical dose — general reference only, NOT a prescription
Measure
Range
Category
Over-the-counter (OTC)
Adult dose
20–40 mg once daily before food
Child (paediatric) dose
Weight-based, about 0.5–1 mg/kg/day — specialist advice
What it is used for
Acid reflux and heartburn (GERD)
Stomach and duodenal ulcers
Stomach protection with long-term painkillers
Part of H. pylori treatment
Common brand names
India: Omez, Ocid, Omecip
Worldwide: Prilosec, Losec
Common side effects
Headache
Diarrhoea, constipation or wind
Nausea
Before taking it — precautions
Take before food, usually before breakfast
Review long-term use
Can interact with some medicines (e.g. clopidogrel)
When to see a doctor urgently
Alarm symptoms (weight loss, trouble swallowing, black stools)
Severe diarrhoea
Muscle cramps (low magnesium)
Doses are a general reference, not a prescription. Doses shown are typical adult/paediatric references and vary with age, weight, kidney/liver function and the exact product. Paediatric doses are usually weight-based and must be set by a doctor. MedDroid cannot prescribe — always confirm omeprazole and your dose with a doctor or pharmacist and the leaflet inside the pack.
Frequently asked questions
How long does omeprazole take to work?
It may ease symptoms in a day or two, with full benefit over a few days.
Can I take omeprazole daily?
Short courses are common; longer use should be guided by a doctor at the lowest effective dose.
Reviewed by Dr. Sanjay Anbu, MBBS. MedDroid is an AI medical assistant and can make mistakes. It provides general health information, not a diagnosis or medical advice — always consult a qualified clinician. In an emergency, contact your local emergency number immediately.