The Best Thing for Sulphur Burps on Mounjaro: What the Evidence Actually Suggests

Why tirzepatide causes sulphur burps — and what that tells us about fixing them

The SURMOUNT-1 trial, published in the New England Journal of Medicine, documented the gastrointestinal side-effect profile of tirzepatide in detail across 2,539 adults over 72 weeks. Nausea, vomiting, diarrhoea and constipation were the most commonly recorded events, with GI symptoms peaking around dose changes and generally settling with time. Sulphur burps aren't listed as a separate adverse event in the clinical record, but they sit within the GI category: they are a direct downstream effect of delayed gastric emptying, which is central to how tirzepatide works.

Slower gastric emptying means food lingers in your stomach longer than usual. Gut bacteria ferment sulphur-containing compounds in that food, producing hydrogen sulphide, the source of the egg-like smell. Knowing this points clearly at the levers you can actually pull: reduce the amount of high-sulphur food reaching the stomach at once, slow down how fast you eat, and give the adjustment period time to pass. If you want to understand more about why sulphur burps happen specifically on Mounjaro, that page goes into the mechanism and practical management in more detail. There is no clinical trial specifically testing remedies for sulphur burps on GLP-1 medicines, so recommendations draw from GI physiology and the broader NHS guidance on managing GI side effects of these medicines, rather than a head-to-head supplement study.

For a fuller picture of the GI side-effect landscape on this treatment, the overview of Mounjaro side effects covers the full range and how each tends to progress over time.

Dietary changes that address the root cause

The most consistently useful adjustment is reducing high-sulphur foods, particularly around dose day and the few days that follow. The main offenders are eggs, red meat, onions, garlic, leeks, broccoli, cauliflower, cabbage and Brussels sprouts. None of these need to be cut permanently, the goal is to reduce the volume arriving in a stomach that is already emptying slowly.

Smaller meals help considerably. Rather than three standard-sized meals, spreading intake across four or five smaller ones reduces the fermentation load at any given time. Eating slowly matters too: tirzepatide suppresses appetite, and many people find that eating past the point of satiety is both uncomfortable and a reliable trigger for burps. Pausing between bites and stopping earlier than you used to is practical advice that aligns with how the medicine is designed to work.

Hydration is worth mentioning separately. Drinking water consistently across the day (rather than large amounts with meals) supports digestion and helps with constipation, which can compound GI symptoms. Fizzy drinks add gas directly, so cutting them during the adjustment phase is sensible. Some people find peppermint tea genuinely soothing; evidence for it is modest, but it is low-risk and worth trying.

If you want to read about how long sulphur burps typically last on Mounjaro, that page covers the adjustment timeline in more detail.

Over-the-counter options and what they can (and cannot) do

Several over-the-counter products are commonly suggested online. It is worth being clear about what they actually do.

Simethicone (found in products like Windeze or Deflatine) breaks up gas bubbles in the gut, which can relieve bloating and belching from trapped gas. It does not reduce hydrogen sulphide production or alter gastric emptying. For ordinary wind, it can be helpful; for sulphur burps specifically, results are variable because the underlying cause is fermentation rather than trapped air.

Antacids such as calcium carbonate can neutralise stomach acid and provide short-term comfort if reflux accompanies the burping. Again, they do not address the fermentation mechanism. Peppermint capsules have a small evidence base for reducing GI spasm and may ease associated nausea, but the effect on sulphur specifically is unproven.

Bismuth subsalicylate (the active ingredient in some US preparations) has been shown to reduce hydrogen sulphide production in the gut. It is available in the UK in certain formulations, but it interacts with several medicines and is not appropriate for everyone. Check with a pharmacist before using it, particularly if you are taking aspirin or anticoagulants.

The NHS page on tirzepatide covers GI side effects and gives sensible guidance on managing them; it is a useful reference alongside your prescriber's advice. Details about how the medicine is priced as a private treatment, for context, are set out on our Mounjaro prices page.

When to go back to your prescriber

Most sulphur burps settle within two to four weeks of a dose change as the body adjusts to the new rate of gastric emptying. If they are severe enough to disrupt eating or sleep, or if they persist well beyond that window, that is worth raising directly. Your prescriber may slow the dose titration schedule, which gives the gut more time to adapt at each level, a recognised and effective approach to managing GI side effects across GLP-1 medicines.

One thing our prescribers hear regularly: people who start treatment at a busy time, perhaps the week before a holiday or over the Christmas period, often find the adjustment harder simply because their diet and routine are different. If that applies to you, mentioning it gives your clinical reviewer useful context when they assess how you are getting on.

Separately, severe and persistent stomach pain that spreads to your back (with or without vomiting) should always prompt urgent medical attention. This is the warning sign associated with pancreatitis, which the MHRA highlighted in a Drug Safety Update for GLP-1 medicines in January 2026 as an infrequent but serious side effect. Sulphur burps alone are not this; the distinction is the severity and location of the pain. If you are unsure, seek help promptly. Those concerned about wider legal and safety questions may also find it useful to read about the Mounjaro side effects lawsuit landscape, which covers what has been reported and alleged in litigation. You can also report any suspected side effects through the MHRA Yellow Card scheme.

For a broader look at what to expect, the Mounjaro treatment page covers how the medicine works and the full clinical picture. If you have questions about starting treatment or adjusting your current plan, start a free consultation and a GPhC-registered prescriber will review your situation the same day.