What's the difference between antacids and PPIs?

Reviewed by Yoshinori Abe, MD

Internal Medicine

Antacids and proton pump inhibitors (PPIs) both treat acid-related stomach problems, but they work differently. Antacids neutralize existing stomach acid on contact, providing fast, short-term relief within minutes. PPIs work more slowly by blocking acid production at the source, offering longer-lasting control over hours to days.

Key differences:

Antacids: Fast-acting, short duration, best for occasional heartburn
PPIs: Slower onset, longer-lasting, best for frequent or chronic acid issues

Choosing the right option depends on your symptoms, their frequency, and any underlying conditions. Since heartburn, reflux, and stomach pain can stem from many causes, guessing wrong could delay proper treatment. Take a free, instant, online symptom check to better understand what's driving your discomfort and get clear guidance on your next steps.

Reviewed for medical accuracy: 07/15/2026

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Explanation

Antacids and proton pump inhibitors (PPIs) are both used to address stomach acid issues, but they work differently. Antacids provide quick relief by neutralizing the acid in your stomach. They are often used for immediate relief of mild heartburn or indigestion.

PPIs, on the other hand, work by reducing the amount of acid your stomach produces. They are used for longer-term treatment and are more effective for conditions like gastroesophageal reflux disease (GERD). PPIs take longer to start working but provide longer-lasting relief.

Key Differences:

Speed: Antacids act fast, while PPIs take longer to work.
Duration: Antacids provide short-term relief, whereas PPIs offer long-term control.
Use: Antacids are for occasional heartburn; PPIs are for chronic conditions.

Choosing between them depends on the severity and frequency of your symptoms. If you're experiencing persistent digestive discomfort and want to better understand what might be causing it, try our free AI symptom checker to get personalized insights.

(References)

Lødrup A, Reimer C, & Bytzer P. (2014). Use of Antacids, Alginates and Proton Pump Inhibitors. Scandinavian journal of gastroenterology, 24874283.
Bruley des Varannes S, Coron E, & Galmiche JP. (2010). Short and Long-Term PPI Treatment for GERD. Do We .... Best practice & research. Clinical gastroenterology, 21126703.
Inadomi JM, & Fendrick AM. (2005). PPI use in the OTC era: who to treat, with what, and for how .... Clinical gastroenterology and hepatology : the official clinical practice journal of the American Gastroenterological Association, 15765438.

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