Vonoprazan
Content date: 13 November 2026
Vonoprazan reduces stomach acid and may be prescribed for reflux or as part of H. pylori treatment. It is a potassium-competitive acid blocker (P-CAB), which works differently from proton pump inhibitors.
Your next step
Check your written prescription and monitoring plan. If anything is unclear, ask your care team before changing a dose.
Get urgent help: Seek emergency care for facial or throat swelling, difficulty breathing, vomiting blood or severe chest pain.
How do I use it?
- Take only the prescribed strength and schedule, with or without food. Swallow tablets whole unless your own leaflet gives different instructions. The dose and treatment length depend on the reason for use; a 10-mg tablet is not equivalent to a 20-mg tablet. H. pylori treatment requires prescribed antibiotics as well: vonoprazan alone does not eradicate the infection.
How do I store it?
- Follow the storage instructions on your pack. Keep it away from children, direct sunlight and excess heat; ask your pharmacist if it has been stored incorrectly.
What tests do I need?
- Tell your clinician about kidney or liver disease so they can check suitability and dose. Selected patients need magnesium or other blood tests during prolonged treatment. After H. pylori treatment, arrange a breath or stool antigen test at least four weeks after the last antibiotic or bismuth dose. The team plans a two-week pause in PPIs or vonoprazan before testing to reduce false-negative results. They may use an H2 blocker or antacid temporarily; follow the team’s and laboratory’s instructions rather than stopping prescribed treatment yourself.
Possible side effects: what to expect
- Not everyone gets side effects. Nausea, abdominal discomfort or diarrhoea may occur; seek advice if persistent. Accompanying antibiotics can also contribute.
- Kidney inflammation, severe allergy and serious skin reactions have been reported; some reported risks have no reliable frequency estimate. Persistent watery diarrhoea or reduced urine needs prompt assessment. During prolonged treatment, selected patients may need magnesium or vitamin B12 testing.
Important points
- Complete the prescribed H. pylori course. Do not add leftover antibiotics or substitute another acid medicine yourself. Ask a pharmacist to check all medicines, particularly HIV treatment and clopidogrel. Discuss pregnancy, plans for pregnancy or breastfeeding before use. If other symptoms persist despite improved heartburn, ask your doctor to assess their cause.
My prescribed plan - complete with the team
Brand / device: ........................ | Dose and how I take or use the medicine: ........................
Next dose: ........................ | Next blood tests: ........................
Team contact: ........................
Brand / device: ........................ | Dose and how I take or use the medicine: ........................
Next dose: ........................ | Next blood tests: ........................
Team contact: ........................
When to get help
Seek emergency care for facial or throat swelling, difficulty breathing, vomiting blood or severe chest pain.
Contact your clinician promptly for persistent watery diarrhoea, reduced urination, new jaundice, swallowing difficulty or unexplained weight loss.