Side effects and problems on treatment

Most side effects are mild and fade within 2 to 3 weeks of a dose change. A small number need urgent help. These guides show you which is which.

Read the side effects guide first. The plateau, hair loss and gallstone guides each explain why the problem happens, what lowers your risk and when to message the clinical team.

Severe stomach pain reaching your back, swelling of the face or throat, or vomiting so severe you keep no fluids down needs urgent care. Call 999 or go to A&E.

By the Aero Clinic editorial team. Updated 4 November 2026. Clinical review pending.

Guides in this series

Side effects: the first 8 weeksWhat is normal, what helps, what is urgent Weight loss medicine safetyWarnings for all four medicines Breaking a plateauWhy loss stalls and what helps Hair loss and weight lossCauses and regrowth timeline GLP-1 and gallstonesThe risk, the signs, the prevention

Other guide series

Mounjaro7 guides Wegovy7 guides Wegovy pill6 guides Foundayo pill6 guides Compare treatments10 guides Using your medicine6 guides Food, movement and sleep9 guides Health conditions6 guides Weight loss maintenance4 guides Weight loss calculators7 guides All guidesEvery guide, grouped by topic

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Page information

Summary: What is normal, what helps and what needs urgent care on weight loss medicine. Guides on side effects, plateaus, hair loss and gallstones. Read more.
Publisher: Aero Clinic, operated by AERO HEALTHCARE LTD.
Editorial update: 4 November 2026
Clinical review: Pending. An editorial update is not a clinical sign-off.

Cite as: Side effects and problems on treatment, Aero Clinic (https://www.cagri.co.uk), AERO HEALTHCARE LTD. https://www.cagri.co.uk/side-effects-and-problems. Editorial update: 4 November 2026. Clinical review pending.