A repeat prescription for an acid-reducing medicine deserves an occasional check-in. Omeprazole and pantoprazole are proton pump inhibitors (PPIs), which reduce stomach acid. They help treat reflux and ulcers; PPIs may also protect the stomach during other treatment. Whether you still need one depends on why it was started, not simply whether heartburn has disappeared.[1][5]
Which symptoms might be side effects?
Omeprazole commonly causes headaches or digestive symptoms such as nausea, stomach pain, constipation, diarrhoea and wind. Pantoprazole can cause similar symptoms, but its routine side effects are classified as uncommon. A pharmacist can help with symptoms that persist or interfere with daily life.[1][2]
What does longer treatment change?
Long-term use can be associated with low vitamin B12, gut infections and fractures. The fracture evidence is largely observational: people taking PPIs may have other reasons for weaker bones, so an association does not establish that the medicine caused a fracture.[2][7]
Low magnesium is another recognised concern. It may cause muscle twitching, dizziness, confusion or an irregular heartbeat; get prompt medical advice for these symptoms. Clinicians should consider magnesium testing before and periodically during prolonged treatment, particularly when a person also uses digoxin or a diuretic. Ask whether testing is appropriate for you.[3]
Bring your full medicine list
Omeprazole and esomeprazole can reduce clopidogrel’s clot-preventing effect. The MHRA discourages those combinations unless essential; its warning does not extend to every PPI. Ask for a medication review rather than stopping clopidogrel or choosing a replacement yourself. Include non-prescription medicines and supplements in the discussion.[1][4]
When to seek help
Get emergency help for throat swelling, breathing difficulty or collapse. Seek urgent assessment for severe or persistent diarrhoea, yellowing eyes or skin, or much less urine. A new sun-sensitive rash with joint pain also needs prompt medical advice.[2]
Difficulty swallowing, repeated vomiting or unexplained weight loss should be assessed. Vomiting blood, black sticky stools or concerning chest pain require urgent help; do not simply take more heartburn medicine.[5][6]
Agree on the next review
Ask what your PPI is treating and when it should be reassessed. Some people need ongoing treatment. If a reduction is appropriate, agree on a plan: stopping can temporarily bring extra acid symptoms, and the best approach depends on your circumstances.[5]
This adult guide provides general information. Follow your prescription and product leaflet; individual treatment decisions belong with your clinician.
Editorial disclosure: General health education, not a personal diagnosis or treatment plan. References checked on 20 October 2026; no clinician-review claim is made. The retained featured image is an illustrative AI-generated image.
References
- NHS: Omeprazole
- NHS: Pantoprazole side effects
- MHRA: Low magnesium
- MHRA: Clopidogrel interaction
- NHS: PPI review
- NHS: Heartburn and acid reflux
- MHRA: PPI fracture evidence
