Omeprazole 20mg: Uses, Dosage and Side Effects
Omeprazole (Capsule, Proton pump inhibitor (PPI)) - Reduces stomach acid to treat heartburn, reflux and ulcers.
Overview
Omeprazole is a proton pump inhibitor that reduces the amount of acid the stomach makes. It is used for heartburn, acid reflux (GERD) and stomach ulcers, and to protect the stomach in people taking NSAIDs.
How It Works
It blocks the proton pump in stomach lining cells, the final step in acid production.
Uses (Indications)
- Heartburn and GERD
- Stomach and duodenal ulcers
- H. pylori treatment (with antibiotics)
- Stomach protection with NSAIDs
Dosage: General Label Information
Contraindications: Who Should Not Take It
- Allergy to PPIs
- Some HIV medicines (e.g. rilpivirine)
Side Effects
- Headache
- Diarrhoea or constipation
- Nausea
- Long-term: low magnesium, B12 deficiency, bone fracture risk
Interactions
- Clopidogrel (reduced effect)
- Methotrexate
- Some antifungals
Storage
Store below 25°C in the original pack.
Patient Counselling Tips
- Swallow whole before food
- Review need regularly
- Lifestyle changes improve reflux
When to See a Doctor
- Difficulty swallowing
- Black stools or vomiting blood
- Weight loss
| Generic name | Omeprazole |
|---|---|
| Medicine class | Proton pump inhibitor (PPI) |
| Form | Capsule |
| Main uses | Heartburn and GERD, Stomach and duodenal ulcers, H. pylori treatment (with antibiotics) |
Before You Take Omeprazole 20mg
Tell your doctor or pharmacist if you are pregnant or breastfeeding, have kidney, liver or heart problems, have had an allergic reaction to any medicine, or take other prescription medicines, herbal remedies or supplements. Bring a list of everything you take to every appointment.
Missed Doses and Long-Term Use
If you miss a dose of Omeprazole 20mg, take it when you remember unless it is almost time for the next one; never double up. Long-term medicines work best when taken at the same time every day. Do not stop suddenly without talking to your prescriber, and keep follow-up appointments and blood tests.
Frequently Asked Questions
How long does omeprazole take?
Some relief in 2-3 days; full effect may take longer.
Can I take it long-term?
Only with medical review.
Omeprazole or pantoprazole?
Both work similarly; choice depends on interactions and cost.
This Omeprazole 20mg guide is educational, based on official labelling and public guidance, and reviewed by the ghkh.site editorial team. Always read the leaflet in your pack and ask your pharmacist.
Sources
We summarise these sources in our own words. Mention of an organisation does not imply endorsement.