How Long Do Sulphur Burps Last on Wegovy — and When Do They Stop?

The reason sulphur burps happen, and why timing matters

The decision most people face at this point is simple: wait it out, or act. Getting the timing right depends on understanding what's actually causing the problem.

Semaglutide slows the rate at which food moves from your stomach into your small intestine, a process called gastric emptying. This is one of the mechanisms behind its appetite-reducing effect, but it has a side effect: food stays in your stomach longer. Proteins containing sulphur (eggs, meat, cruciferous vegetables, onions) have more time to break down anaerobically, producing hydrogen sulphide gas. That gas exits via burping, and it smells exactly as unpleasant as it sounds.

The timing of when burps are most noticeable is directly tied to this adjustment process. Your gut hasn't yet recalibrated to the slower transit speed. Once it does, the volume of gas produced drops back. That's why the first one to two weeks after starting Wegovy, or after a dose step-up, tend to be the worst. It is also why the discomfort can reappear briefly with each increase in your dose, your body is readjusting to a new level of gastric slowing each time. Our page on whether Wegovy causes sulphur burps covers the underlying mechanism in more detail if you want the full picture.

The important point: for most people, this is a temporary and dose-linked phenomenon, not a permanent feature of being on semaglutide.

How long sulphur burps actually last, the realistic picture

Clinical trial data doesn't isolate sulphur burps as a separate data point, so the evidence here is drawn from the broader gastrointestinal profile of semaglutide. In the STEP 1 trial, published in the New England Journal of Medicine, nausea and gastrointestinal effects were most frequent in the early weeks of treatment and at each dose escalation, then declined significantly over time. Burping is classified under this same GI cluster.

In practice, the pattern most prescribers observe looks roughly like this: burps are most frequent in days two to five after a new dose, when gastric emptying slowing reaches its peak effect on gut transit. By the end of week two, most people report a clear reduction. By week four (roughly when a dose review would typically happen) GI symptoms including burping have generally settled to a manageable background level, if they're present at all.

A minority of people find they persist beyond two weeks. This is more likely if meals are large, sulphur-containing foods are frequent, or hydration is low. Certain gut conditions can also slow the resolution. If burps remain prominent after four weeks at the same dose with no sign of easing, it's worth raising with your prescriber, not because it signals danger, but because they can help identify whether something specific is extending the adjustment period. You can read more about the broader Wegovy side effects profile to put this in context.

What shortens the duration, practical decisions that actually help

You can influence how long sulphur burps last. Several factors within your control affect the speed of the gut adjustment window.

Meal size matters most. Large meals load the stomach when it's already slow to empty; smaller, more frequent eating reduces the fermentation window and the resulting gas. Some people find that eating more slowly has a similar effect, less air swallowed, less protein sitting undigested for extended periods.

Reducing high-sulphur foods during the first two weeks of each dose level also helps. Eggs, red meat, broccoli, cauliflower, garlic and onions are the main culprits. This doesn't need to be permanent; the adjustment window is short, and you can reintroduce foods once your gut has settled. Staying well hydrated supports gut motility and reduces the fermentation effect. Fizzy drinks, by contrast, add gas directly, worth skipping during the worst of it.

If you're looking at whether anything specifically helps to stop burps once they've started, our page on stopping sulphur burps on Wegovy covers that directly. The overlap between duration and management is significant: most things that reduce severity also shorten how long they last.

One thing our prescribers are asked frequently: does everyone actually get sulphur burps with Wegovy, or is it only some people who experience this? Not everyone does, but it means the dose is doing something when it occurs. That's a different question. If you're genuinely struggling with GI side effects, speaking to your prescriber is the right move, not stopping treatment without advice. There are strategies, and sometimes timing adjustments help. You can also find broader context about Wegovy risk factors if you want to weigh up the full safety picture before or during treatment.

When to get medical help, and when not to worry

Sulphur burps alone don't require urgent medical attention. But some symptoms that coincide with GI disturbance during Wegovy treatment do.

Seek urgent help if you develop severe, persistent abdominal pain, particularly if it radiates through to your back. The MHRA Drug Safety Update on GLP-1 medicines (January 2026) highlighted acute pancreatitis as an infrequent but serious side effect: stomach pain that is severe and doesn't pass is the signal to act. This is distinct from the dull, gassy discomfort that comes with normal burping.

Also worth noting: vomiting severe enough to stop you keeping fluids down, or diarrhoea that lasts more than a day or two, can cause dehydration and is worth a call to your GP or 111, not because Wegovy has caused a crisis, but because dehydration needs managing. If you want a fuller picture of how sulphur burps and Wegovy relate across the treatment journey, that page brings together the key information in one place. The NHS semaglutide page is clear that GI effects should be monitored and reported if they're affecting your ability to eat or drink normally.

If you want to explore treatment options or have specific questions about your response to Wegovy, our prescribers carry out a free consultation and are available for aftercare seven days a week. Semaglutide is a prescription-only medicine, any change to your dose or treatment plan goes through clinical review, not guesswork.