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Pantoprazole is a proton pump inhibitor that reduces stomach acid. Symptoms may start to improve within 2 to 3 days, but the full effect can take up to 4 weeks.
What are the side effects?
Most people have none. Headache, diarrhoea, nausea, constipation, dry mouth and tiredness can occur.
Is long-term use a concern?
After more than 3 months, magnesium levels may drop. After more than a year, the risk of fractures, gut infections and low vitamin B12 may increase. Your doctor should review whether you still need it.
When should I get help?
Contact a doctor straight away for joint pain with a rash on sun-exposed skin, yellow skin or eyes, dark urine, reduced urination, swollen ankles, or severe diarrhoea. Seek prompt advice for trouble swallowing, feeling full quickly, repeated vomiting or unexplained weight loss. Call your local emergency number (000 in Australia) for sudden swelling of the lips, mouth, throat or tongue, trouble breathing, or fainting.
Doses vary, so follow your prescriber, pharmacist and the medicine label. In Australia, call 000 in an emergency, or the Poisons Information Centre on 13 11 26 for a possible overdose. Outside Australia, use your local emergency and poison-information services.
Source: NHS: Side effects of pantoprazole and NHS: Common questions about pantoprazole. General education does not replace individual medical advice. Updated November 2026.
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