Drug Class Guide
Proton Pump Inhibitors (PPIs)
The strongest acid-reducing medicines, used for reflux, ulcers and H. pylori, and among the most overused when taken for years without review.
How Proton Pump Inhibitors Work
PPIs shut down the proton pumps in the stomach lining that release acid. They work best taken 30 to 60 minutes before a meal, when the pumps are about to switch on. It takes a few days to reach the full effect, so they are not meant for quick relief of occasional heartburn.
What Proton Pump Inhibitors Treat
- GERD (acid reflux)
- Stomach and duodenal ulcers
- H. pylori treatment, with antibiotics
- Protecting the stomach during NSAID use
Proton Pump Inhibitors in Our Medication Guide
- OmeprazolePrilosecAvailable over the counter; can reduce how well clopidogrel works.
- EsomeprazoleNexiumAvailable over the counter and by prescription.
- PantoprazoleProtonixFewer drug interactions; an IV form is used in hospitals.
- RabeprazoleAciphexPrescription; GERD, ulcers and H. pylori treatment.
- DexlansoprazoleDexilantDual delayed-release capsule that can be taken with or without food.
Common Side Effects
Short-term side effects are uncommon and mild: headache, nausea, diarrhea or belly pain. With long-term use, PPIs are linked to low vitamin B12 and magnesium, C. difficile diarrhea, and a higher risk of some fractures, which is why they should be used at the lowest dose that works.
Important Cautions
- Over-the-counter PPIs are meant for 14-day courses, no more than three times a year, unless a doctor advises otherwise.
- Trouble swallowing, vomiting blood, black stools or weight loss need prompt evaluation, not just acid suppression.
- After long use, stopping suddenly can cause rebound heartburn for a few weeks.
Side-by-Side Comparisons
Common Questions About Proton Pump Inhibitors
Is it safe to take a PPI long term?
For people who need one, such as those with Barrett's esophagus, severe esophagitis or a high risk of stomach bleeding, the benefits usually outweigh the risks. For many others, a PPI started years ago is never reviewed. We check whether you still need it, whether a lower dose works, and your B12 and magnesium if you have been on one for a long time.
Which PPI is best?
At equivalent doses, PPIs heal reflux and ulcers about equally well. The choice usually comes down to cost, insurance coverage and drug interactions. Pantoprazole, for example, has fewer interactions than omeprazole.
How do I stop taking a PPI?
If you have taken one for months, lowering the dose gradually over a few weeks, and using an antacid or H2 blocker for breakthrough heartburn, helps avoid rebound symptoms. Talk with your doctor first; some conditions need ongoing treatment.
This guide is general information, not a substitute for advice about your own medicines. Do not start, stop or switch a medication without talking with your doctor. Questions about a prescription? Our internal medicine team can help.
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Trusted Resources for Proton Pump Inhibitors
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