Mounjaro side effects in the UK

A careful guide to common side effects, urgent warning signs and official UK sources. This is general information, not medical advice.

Common side effects

Official UK guidance lists digestive symptoms such as nausea, diarrhoea, vomiting, constipation, abdominal pain and reduced appetite among the possible side effects of Mounjaro.

When to seek help

Seek urgent medical help for a severe allergic reaction, severe or persistent abdominal pain, or signs of serious dehydration. Speak to your prescriber or pharmacist about symptoms that are troublesome, persistent or getting worse.

Use official sources

Read the current NHS guidance and Mounjaro patient information leaflet. Do not change your dose or stop treatment based on this page. Contact your prescriber or pharmacist for advice about your own circumstances.