Cafeity Get the app

Side effects

Dizziness on a GLP-1 medicine

Dizziness is less common than the gut side effects, but it deserves attention because of what can sit behind it: dehydration, falling blood pressure — sometimes because blood-pressure medicines that suited you at a higher weight no longer do — and, for some people, low blood sugar.

By the Cafeity teamUpdated 3 min read

The short answer

Dizziness is a listed side effect of GLP-1 medicines: 8% on semaglutide 2.4 mg against 4% on placebo, 4–5% on tirzepatide against 2%, 6.9% on liraglutide 3 mg against 5%, and 4% on orforglipron against 3%.1234 Low blood pressure was also more common on treatment — 1.6% on tirzepatide against 0.1% — and more so in people taking blood-pressure medicines.2 Dehydration and, with insulin or a sulfonylurea, low blood sugar are other causes. Fainting, a racing heart at rest or chest pain need a clinician.

Bar chart of dizziness in the weight-management trials: Semaglutide 2.4 mg 8% versus 4% on placebo; Tirzepatide 5% versus 2% on placebo; Liraglutide 3 mg 6.9% versus 5% on placebo.
Share of trial participants who reported dizziness, from each label. Orforglipron (4% against 3%) is reported in its label text rather than its table, so it appears in the table below. Not a head-to-head comparison.

How common it is

Dizziness 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%8%
Semaglutide 7.2 mg weekly injection (adults with obesity)1%5% (2.4 mg), 6% (7.2 mg)
Tirzepatide weekly injection (adults with obesity or overweight)2%4% (5 mg), 5% (10 mg), 4% (15 mg)
Liraglutide 3 mg daily injection (adults with overweight or obesity)5%6.9%
Exenatide twice-daily injection (adults with type 2 diabetes)6%9%
Orforglipron daily tablet (adults with obesity or overweight)3%4% (all doses pooled)

Blood pressure

As weight falls, blood pressure often falls with it. The labels record hypotension more often on treatment: 1.3% against 0.4% for semaglutide 2.4 mg (with fainting in 0.8% against 0.2%), 1.6% against 0.1% for tirzepatide, and 2% against 0.5% for orforglipron.124 In each case it was seen more often in people also taking medicines for blood pressure, and some episodes came with gastrointestinal side effects and fluid loss.

If you take blood-pressure medicines, it is worth asking your prescriber how they will be reviewed as your weight changes — a home blood-pressure reading in your record makes that conversation easy.

Other causes

  • Dehydration from vomiting, diarrhoea or simply drinking less.2
  • Low blood sugar in people taking insulin or a sulfonylurea; dizziness and light-headedness are among its listed signs.2
  • Eating very little.

Heart rate also rises slightly on these medicines, and the labels ask patients to report palpitations or a racing heartbeat at rest.1

When to contact your prescriber

Keeping a record of it

Log dizziness 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.

Download Cafeity on the App Store

Common questions

Can GLP-1 medicines cause dizziness?
Yes; it is listed on the labels, for example 8% against 4% on semaglutide 2.4 mg.1 Dehydration, lower blood pressure and low blood sugar are common contributors.
Should I stop my blood-pressure medicine?
Not on your own. Ask your prescriber — the labels note low blood pressure was more common in people on blood-pressure medicines, which is something to review, not to self-adjust.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

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.