Acid-Reducing Medicines

About This Medicine

Make sure you know about each of the medicines you take. This includes why you take it, how to take it, what you can expect while you're taking it, and any warnings about the medicine.

The information provided here is general. So be sure to read the information that came with your medicine. If you have any questions or concerns, talk to your pharmacist or doctor.

What are some examples?

Examples of acid reducers include:

  • Rolaids
  • Mylanta
  • Maalox
  • Tums
H2 blockers.
  • cimetidine (Tagamet)
  • famotidine (Pepcid)
Proton pump inhibitors (PPIs).
  • Prevacid (lansoprazole)
  • Nexium (esomeprazole)
  • Prilosec (omeprazole)

Why are acid-reducing medicines used?

Acid reducers may be used to:

  • Treat gastroesophageal reflux disease (GERD).
  • Treat ulcers.
  • Help prevent problems in people who are at risk for ulcers, like those who take NSAIDs (nonsteroidal anti-inflammatory drugs) long-term and those who are in the hospital.

How do they work?

Acid-reducing medicines work in two ways. Antacids work right away by making the stomach juices less acidic. H2 blockers and PPIs work by lowering the amount of acid your stomach makes. They take longer to work than antacids.

What about side effects?

Many people don't have side effects. And minor side effects might go away after a while.

H2 blockers can cause headaches or make you dizzy. They might cause diarrhea or constipation. You may have nausea and vomiting.

PPIs can cause headaches and diarrhea. Using them for a long time may raise your risk for infections or broken bones.

Some antacids can cause constipation or diarrhea. The brands vary in the ingredients they use. They can have different side effects.

If you use some of these medicines for a long time, your body may not get enough of some vitamins and minerals.

General information about side effects

All medicines can cause side effects. Many people don't have side effects. And minor side effects sometimes go away after a while.

But sometimes side effects can be a problem or can be serious.

If you're having problems with side effects, talk to your doctor. Your doctor may be able to lower your dose or change to a different medicine.

Always be sure you get specific information on the medicine you're taking. For a full list of side effects, check the information that came with the medicine you're using. If you have questions, talk to your pharmacist or doctor.

What are some cautions about acid-reducing medicines?

Some H2 blockers and PPIs can affect how other medicines work. Tell your doctor if you use other medicines. The doctor may change the dose or give you a different medicine.

Many antacids have aspirin in them. Read the label to make sure that you don't take too much. Too much aspirin can be harmful.

Be safe with medicines. Take your medicines exactly as prescribed. If you take over-the-counter medicine, be sure to read and follow all instructions on the label. Call your doctor if you think you are having a problem with your medicine.

Check with your doctor or pharmacist before you use any other medicines. This includes over-the-counter medicines. Tell your doctor about all of the medicines, vitamins, herbal products, and supplements you take. Taking some medicines together can cause problems.


Current as of: October 19, 2023

Author: Healthwise Staff
Clinical Review Board
All Healthwise education is reviewed by a team that includes physicians, nurses, advanced practitioners, registered dieticians, and other healthcare professionals.

This information does not replace the advice of a doctor. Healthwise, Incorporated, disclaims any warranty or liability for your use of this information. Your use of this information means that you agree to the Terms of Use. Learn how we develop our content.

© 1995-2024 Healthwise, Incorporated. Healthwise, Healthwise for every health decision, and the Healthwise logo are trademarks of Healthwise, Incorporated.

Join Us

We believe that health disparities will continue to exist, only if we allow them to continue. Knowing how to take charge of your health care system is critical to getting the best health care possible.