Rabeprazole

Key facts

• Rabeprazole is a proton pump inhibitor. It blocks the pumps in your stomach lining that release acid, reducing acid production for a full day with one dose.
• You take it once daily, usually before a meal; most people notice improvement within a few days, though ulcers may take several weeks to heal.
• Long-term use, especially beyond a year, is linked to low magnesium, vitamin B12 deficiency, an increased risk of bone fracture, and gut infections; use the lowest dose that controls your symptoms for the shortest time needed.
• Seek care for difficulty or pain swallowing, unintended weight loss, vomiting blood, or black or tarry stools; these need investigation, not more acid suppression.

What rabeprazole treats

Rabeprazole treats gastro-oesophageal reflux disease, where stomach acid rises into the oesophagus and causes heartburn and irritation, and peptic ulcers in the stomach or duodenum. It is also used with antibiotics to treat Helicobacter pylori infection, and to protect the stomach lining in people taking regular NSAID painkillers.

How rabeprazole works

Specialised cells in your stomach lining use proton pumps to push acid into the stomach. Rabeprazole binds to these pumps and switches them off, cutting acid production at its source. With less acid present, irritated tissue in the stomach or oesophagus has a chance to heal, and reflux symptoms ease.

Before you take it

• Tell your prescriber about severe liver disease, since your dose may need adjusting.
• Mention other medicines, particularly ones needing stomach acid for absorption, such as certain antifungals and some HIV medicines, and clopidogrel, since PPIs can weaken its antiplatelet effect.
• If you have ever had a low magnesium level, this should be checked before long-term treatment and periodically during it.
• Persistent or alarm symptoms such as weight loss, difficulty swallowing, or vomiting blood should be assessed by a doctor before starting long-term treatment, since a PPI can mask them.

Side effects

Common effects include headache, mild stomach cramps, nausea, diarrhoea, and dry mouth or a changed sense of taste.

Stop and seek urgent medical care for any of these:

• Vomiting blood, or black, tarry stools.
• Severe or persistent abdominal pain.
• Signs of a serious allergic reaction: rash, swelling, or difficulty breathing.
• New confusion, muscle cramps, or an irregular heartbeat, which can signal low magnesium.

Safety essentials

• Use the lowest effective dose for the shortest time that controls your symptoms; long-term high-dose use raises the risk of fracture, low magnesium, vitamin B12 deficiency, and intestinal infections such as Clostridioides difficile.
• If you are on long-term treatment, your prescriber may periodically check your magnesium and B12 levels.
• Do not use rabeprazole to mask unexplained weight loss, persistent vomiting, or swallowing difficulty; these need medical assessment first.

This page is educational and does not replace advice from a doctor or pharmacist who knows your health history.