Heartburn on Ozempic: why it happens and what helps

What this guide covers

Heartburn and acid reflux are common on a GLP-1 because semaglutide (Ozempic, Wegovy) slows stomach emptying, leaving food and acid to sit longer. Here is the mechanism, the practical fixes, and when reflux is a reason to call your doctor. This is patient education, not a substitute for the prescriber who knows your case. Generic names sit next to brand names throughout: semaglutide (Ozempic, Wegovy), tirzepatide (Mounjaro, Zepbound).

Key points

• The short answer: a fuller stomach for longer. Heartburn and acid reflux are common on a GLP-1, and the reason traces straight back to how the drug works. Semaglutide (Ozempic, Wegovy) and tirzepatide (Mounjaro, Zepbound) slow how quickly the stomach empties. Food and stomach acid sit there longer than you are used to, the stomach stays fuller for longer, and that pressure makes it easier for acid to push back up into the esophagus, the burning behind the breastbone you feel as heartburn. Gastrointestinal effects, including indigestion and reflux-type symptoms, are documented in the prescribing information for these drugs. It is usually worst in the first weeks and after each dose increase, and for most people it eases as the body adjusts.
• What actually helps. Most of what works is about not overfilling a stomach that is already emptying slowly. Smaller, more frequent meals beat large ones, and stopping before you feel full gives the slowed stomach less to manage. Lower-fat meals leave the stomach faster than fatty ones, which sit longest. The classic reflux moves apply too: stay upright for two to three hours after eating rather than lying down, and avoid the usual triggers in the evening, large late meals, alcohol, coffee, and very spicy or acidic food. Raising the head of the bed helps nighttime symptoms. An occasional over-the-counter antacid is reasonable for most people, but check with your pharmacist before adding a daily acid reducer, since timing and interactions matter on your medication list.
• How long it usually lasts. Like most GLP-1 stomach effects, reflux tends to cluster in the first few weeks of a new dose and flare again briefly after each step up, then settle as the body adapts. A practical way through is not rushing the dose escalation, the manufacturer's schedule is a floor your prescriber can stretch, not a deadline, and staying a few weeks longer on a comfortable dose is a common and reasonable choice. If heartburn is not fading after several weeks on the same dose, is happening most days, or is waking you at night, that is the point to bring it to your prescriber rather than reaching for antacids indefinitely.
• When reflux is a reason to call. Most reflux on a GLP-1 is uncomfortable but manageable. Call your prescriber for heartburn that needs an antacid most days, reflux that wakes you from sleep, trouble or pain when swallowing, food that feels stuck, or unintentional vomiting, those deserve a proper look rather than self-treating. Seek urgent care for vomiting blood or material that looks like coffee grounds, black or tarry stools, or chest pain you are not sure about, crushing chest pressure, especially with shortness of breath, sweating, or pain into the arm or jaw, is a heart emergency until proven otherwise, not heartburn. When in doubt about chest pain, treat it as the heart, not the stomach.

Frequently asked questions