Short answer: Yes, all four US labels list burping and gas, and the weight-loss labels list bloating. In the adult weight-loss trials, burping was reported by 7% on Wegovy versus under 1% on placebo and 4% to 5% on Zepbound versus 1%. Gas was 6% versus 4% on Wegovy. The diabetes labels report lower rates, under 4%. The labels do not describe "sulfur burps" or any particular smell.
The labels use medical terms: eructation means burping, flatulence means passing gas, and abdominal distension means a bloated, swollen-feeling belly. The Wegovy patient leaflet lists belching, gas and feeling bloated among the most common side effects; the Zepbound leaflet lists belching.
| Medicine and trials | Burping | Gas | Bloating |
|---|---|---|---|
| Ozempic 0.5 mg and 1 mg, type 2 diabetes | 2.7% and 1.1% (0%) | 0.4% and 1.5% (0.8%) | Not listed |
| Wegovy 2.4 mg, adults, weight reduction | 7% (under 1%) | 6% (4%) | 7% (5%) |
| Mounjaro 5, 10 and 15 mg, type 2 diabetes | 3.0%, 2.5%, 3.3% (0.4%) | 1.3%, 2.5%, 2.9% (0%) | 0.4%, 2.9%, 0.8% (0.4%) |
| Zepbound 5, 10 and 15 mg, weight reduction | 4%, 5%, 5% (1%) | 3%, 3%, 4% (2%) | 3%, 3%, 4% (2%) |
In the Wegovy 7.2 mg trials, gas was reported by 4% on 7.2 mg, 2% on 2.4 mg and 2% on placebo. In the Wegovy trial of people aged 12 and older, burping was 4% against 0% on placebo.
The trials differ in doses, length and the people in them, and each label warns against comparing one drug's rates directly with another's.
People online often describe burps that smell or taste like rotten eggs on these medicines. None of the four labels describe the smell or taste of burps, so there is no label rate for that specific complaint. What the labels do describe is slower stomach emptying: the Ozempic label says semaglutide delays early stomach emptying after a meal, and the Mounjaro and Zepbound labels say tirzepatide delays it, most after the first dose and less over time.
The labels do not connect that effect to burping in particular, so it is a possible link rather than an established one.
Burping, gas and bloating are listed as common side effects, not warnings. The labels do flag other stomach symptoms that need a call:
The Ozempic label also lists intestinal blockage (ileus, intestinal obstruction) and severe constipation among reports received after approval.
Like other stomach side effects on these medicines, the labels tie most of them to starting and raising the dose. If burping or bloating is new, it helps to note the day it started counted from your last dose and dose change, whether it comes after large or late meals, and whether it is easing week to week. Dose Track logs side effects next to each dose so the timing is easy to show your prescriber.
Read more on Dose Track: GLP-1 side effects week by week · Nausea on GLP-1s: what the labels say · Ozempic side effects · Wegovy side effects · Mounjaro side effects · Zepbound side effects