Sulfur Burps on a GLP-1: Why They Happen and How to Stop Them

Of all the GLP-1 side effects, sulfur burps might be the most viscerally unpleasant — and the most googled. They’re burps that smell like rotten eggs (that’s hydrogen sulfide gas), and while they’re deeply unglamorous, they’re usually harmless. Here’s why they happen and what actually helps.

Why the rotten-egg smell

It traces back to slowed gastric emptying. When food sits in your stomach longer than it used to, it has more time to interact with gut bacteria that produce sulfur-smelling gas — especially after sulfur-rich or high-fat meals. The medication doesn’t create the smell; it creates the conditions for it: a slow, full stomach where food lingers and ferments. Many people get the classic one-two of sulfur burps followed by diarrhea.

What helps

The playbook overlaps heavily with nausea management, because the root cause is the same slowed, overfull stomach.

Smaller, lower-fat meals

The highest-impact change. Less food — and especially less fat, which slows the stomach further — means less material sitting and fermenting. Big, greasy meals are the most common trigger.

Ease up on sulfur-heavy foods (when flaring)

You don’t need to ban these forever, but when sulfur burps hit, temporarily easing off the usual culprits helps: eggs, red meat, garlic, onions, dairy, and cruciferous vegetables (broccoli, cauliflower, cabbage). Notice which ones set you off — triggers are individual.

Timing and position

Don’t lie down on a full stomach, and avoid large late-night meals — a slow stomach plus gravity working against you is the worst combination for both burps and reflux.

Over-the-counter options

Simethicone (an anti-gas remedy) helps some people; others find relief with remedies their pharmacist can point them to. Worth a low-cost try.

When it’s more than a nuisance

On their own, sulfur burps are unpleasant but not dangerous. The combination that changes the picture is burping together with persistent vomiting, severe abdominal pain, or an inability to keep food down. That pattern can point toward gastroparesis (severely stalled stomach emptying) or a dose that’s simply too aggressive for you — both of which are reasons to call your prescriber rather than ride it out. Dose reduction exists for exactly this.

The takeaway

Sulfur burps are the slowed stomach talking. Smaller, lower-fat, earlier meals quiet it down for most people, and OTC anti-gas remedies cover much of the rest. It’s the combination with severe or persistent vomiting and pain — not the burps alone — that’s your signal to get it checked.

Sources: Wegovy and Zepbound prescribing information (gastrointestinal adverse reactions); FDA labeling and safety communications on GLP-1 gastrointestinal effects.