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Side effects

Bloating and wind on a GLP-1

A tight, full belly hours after a modest meal is one of the more uncomfortable surprises of a GLP-1. Bloating and wind are listed side effects, and they share a cause with most of the others: food moving through more slowly than it used to.

By the Cafeity teamUpdated 3 min read

The short answer

Bloating (abdominal distension) and wind (flatulence) are listed GLP-1 side effects. In the weight-management trials, bloating was reported by 7% on semaglutide 2.4 mg against 5% on placebo, up to 4% on tirzepatide against 2%, 4.5% on liraglutide 3 mg against 3%, and up to 9% on orforglipron against 3%; wind by 3–6% against 2–4%.1234 Smaller meals, eating slowly and increasing fibre gradually tend to help. Severe pain with a swollen abdomen, vomiting or being unable to pass wind needs urgent care.

Bar chart of bloating in the weight-management trials: Semaglutide 2.4 mg 7% versus 5% on placebo; Tirzepatide 4% versus 2% on placebo; Liraglutide 3 mg 4.5% versus 3% on placebo; Orforglipron 9% versus 3% on placebo.
Share of trial participants who reported abdominal distension (bloating), from each label. Not a head-to-head comparison.

How common it is

Bloating (abdominal distension)

Bloating (abdominal distension) in placebo-controlled trials, from the current US prescribing information for each medicine. Rates from different medicines' trials are not directly comparable.
Medicine (trial population)PlaceboMedicine
Semaglutide 2.4 mg weekly injection (adults with obesity or overweight)5%7%
Tirzepatide weekly injection (adults with obesity or overweight)2%3% (5 mg), 3% (10 mg), 4% (15 mg)
Liraglutide 3 mg daily injection (adults with overweight or obesity)3%4.5%
Orforglipron daily tablet (adults with obesity or overweight)3%7% (5.5 mg), 9% (9 mg), 8% (17.2 mg)

Wind (flatulence)

Wind (flatulence) in placebo-controlled trials, from the current US prescribing information for each medicine. Rates from different medicines' trials are not directly comparable.
Medicine (trial population)PlaceboMedicine
Semaglutide 2.4 mg weekly injection (adults with obesity or overweight)4%6%
Semaglutide 7.2 mg weekly injection (adults with obesity)2%2% (2.4 mg), 4% (7.2 mg)
Tirzepatide weekly injection (adults with obesity or overweight)2%3% (5 mg), 3% (10 mg), 4% (15 mg)
Liraglutide 3 mg daily injection (adults with overweight or obesity)2.5%4%
Orforglipron daily tablet (adults with obesity or overweight)2%5% (5.5 mg), 6% (9 mg), 6% (17.2 mg)

Why it happens

The medicines slow stomach emptying, and food that sits longer ferments more.12 Swallowed air from eating quickly, fizzy drinks, and a sudden increase in fibre all add to it. Constipation, common on these medicines, makes bloating worse — see constipation.

What tends to help

  • Smaller, more frequent meals, as the 2025 joint advisory suggests for gastrointestinal side effects generally.5
  • Eating slowly, and stopping at the first sign of fullness.
  • Increasing fibre gradually, with fluid, rather than all at once.
  • Going easy on fizzy drinks and very fatty meals.
  • Moving — a short walk after meals helps many people.

When to contact your prescriber

Keeping a record of it

Log bloating with a severity and a time, on the same timeline as your doses, meals and fluids. After a few weeks the record shows whether it follows dose increases, particular foods or the days after an injection — and the Visit Summary puts that on one page for your prescriber.

Cafeity dose screen: an estimated medication-level curve labelled "Estimate based on published half-life. Not a measurement", the last dose, the injection site (stomach, lower left), a countdown to the next scheduled dose and a side-effect check-in.
A side-effect check-in under every dose.
Cafeity "Your week, understood" screen: Ora explains that everything is calculated from your own log, offers questions such as "When are my symptoms worst?", and shows the week's protein, energy, water, weight trend, symptom days and a note that protein was 80 g under target.
Ask when your symptoms are worst.

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Common questions

Why am I so bloated on a GLP-1?
Slower stomach emptying means food sits longer; constipation, eating quickly and fizzy drinks add to it. Bloating is a listed reaction on the labels.14
Does bloating go away?
Like other gastrointestinal reactions it is usually worst during dose increases and eases over time; managing constipation often helps too.2

Sources

  1. Semaglutide injection and tablets for weight management — US prescribing information DailyMed, US National Library of Medicine, version published 30 June 2026
  2. Tirzepatide injection for weight management and obstructive sleep apnoea — US prescribing information DailyMed, US National Library of Medicine, version published 2 September 2026
  3. Liraglutide 3 mg injection for weight management — US prescribing information DailyMed, US National Library of Medicine, version published 15 June 2026
  4. Orforglipron tablets for weight management — US prescribing information DailyMed, US National Library of Medicine, version published 13 August 2026
  5. Nutritional priorities to support GLP-1 therapy for obesity: a joint advisory from the American College of Lifestyle Medicine, the American Society for Nutrition, the Obesity Medicine Association and The Obesity Society Mozaffarian D et al. 2025 (published in four journals)

Written by the Cafeity team from the sources listed here. Figures from prescribing information are quoted as the label states them; trial results are averages from those trials, not predictions for any one person. This page has not yet been reviewed by a clinician — see the editorial policy for how pages are researched and corrected.