If your burps got weird or heartburn showed up out of nowhere, you're far from alone. Both are on the labels. Here's how common they were in trials, what a slower stomach has to do with it, what may help, and when it's more than heartburn.
Are burping and heartburn side effects of GLP-1s?
Yes. The Wegovy Medication Guide lists belching, upset stomach and heartburn among the most common side effects. The labels give numbers from each medicine's placebo-controlled trials:
| Medicine (dose) | Burping | Upset stomach (dyspepsia) | Reflux (GERD) |
|---|---|---|---|
| Wegovy (2.4 mg) | 7% vs less than 1% | 9% vs 3% | 5% vs 3% |
| Zepbound (5, 10, 15 mg) | 4%, 5%, 5% vs 1% | 9%, 9%, 10% vs 4% | 4%, 4%, 5% vs 2% |
| Ozempic (0.5 mg, 1 mg) | 2.7%, 1.1% vs 0% | 3.5%, 2.7% vs 1.9% | 1.9%, 1.5% vs 0% |
Each label says rates from different trials can't be compared directly, so compare each row with its own placebo, not with the other rows. Sources: Wegovy, Zepbound and Ozempic labels, section 6.1.
What does a slower stomach have to do with it?
Normally your stomach muscles grind food into smaller pieces and push it on into the small intestine. The stomach "slowly empties its contents," says the NIDDK, part of the National Institutes of Health.
GLP-1 medicines slow that push. The Wegovy label says it delays gastric emptying. Burping and heartburn are among the stomach effects listed in the same labels, though the labels don't spell out the path from one to the other.
“Tirzepatide delays gastric emptying. The delay is largest after the first dose and this effect diminishes over time.”
Why do the burps smell like eggs?
The labels say "eructation," which means burping. They don't describe a smell, and we didn't find a trusted medical source that explains a sulfur smell on GLP-1s, so we won't guess. If burps come with severe pain, fever or yellow skin, call your doctor.
When are these side effects most common?
- During dose steps. The Wegovy label says stomach reactions "were most frequently reported during dosage escalation."
- Early on, then easing. The Zepbound label says most nausea, vomiting and diarrhea happened during dose escalation and decreased over time. Dose steps are your prescriber's call.
What can help?
Heartburn is when stomach contents come back up into the esophagus, the tube that runs from your throat to your stomach (NIDDK). The NIDDK's general tips for reflux aren't written for GLP-1s, but they're a fair place to start:
- Eat meals at least 3 hours before you lie down. The NIDDK says this may improve symptoms.
- Notice your own triggers. The NIDDK lists foods and drinks commonly linked to reflux symptoms: high-fat foods, alcoholic drinks, coffee and caffeine, chocolate, mint, spicy foods, and acidic foods like citrus and tomatoes. You don't need to cut everything, just see which ones set yours off (NIDDK).
- Small meals every few hours with enough fluids. The 2025 nutrition advisory from four US nutrition and obesity societies mentions this for stomach side effects (advisory).
Tell your doctor if stomach problems are severe or won't go away. Ask your pharmacist or doctor before adding an antacid or other new medicine, since GLP-1s slow the stomach and can change how some pills are absorbed.
When is it more than heartburn?
- Severe stomach pain that won't go away, with or without vomiting, sometimes spreading to your back. The medication guides say this can be a sign of pancreatitis: stop the medicine and call your provider right away.
- Pain in your upper stomach, yellow skin or eyes, fever, or clay-colored stools. The Wegovy Medication Guide lists these as possible gallbladder problems: call your provider.
- Chest pain or trouble breathing: call 911.
How Checkin helps with side effects
Checkin is a free AI companion for GLP-1s that you text. For this part of life on a GLP-1, it does three things:
- Text how you feel, any time
Plain answers from the FDA label, with a picture when it helps.
- It checks in two days after your shot
When many side effects show up, so you're not sorting it out alone.
- Warning signs get a straight answer
If something sounds serious, it tells you to call your doctor or 911 right away.
