The Truth About Mounjaro Side Effects on Your Skin

Last updated: 13 October 2026.

Mounjaro (tirzepatide) can cause side effects, most often digestive symptoms. Some people also notice hair loss or changes in their face and skin while losing weight. This guide separates known medicine side effects from appearance changes that may accompany weight loss, and explains what the evidence can—and cannot—tell us.

Important: Riverbanks Clinic does not prescribe or supply Mounjaro or other weight-management medicines. Do not stop, change or adjust a prescribed medicine because of skin or facial concerns without speaking to your prescriber.

In this article

• Side effects at a glance
• Common side effects and when to seek urgent help
• Face and skin changes
• What you can do
• References

Mounjaro side effects at a glance

• Nausea, diarrhoea, vomiting, constipation and stomach pain are among the common side effects.
• The NHS also lists itchy or red injection-site skin and hair loss as common side effects.
• Facial volume or skin changes can happen during substantial weight loss, but current evidence does not establish that Mounjaro selectively removes facial fat or depletes a skin fat layer called dWAT.
• Seek advice from your prescriber about side effects. For severe or worrying symptoms, use NHS 111 or emergency services as appropriate.

What is Mounjaro?

Mounjaro is the brand name for tirzepatide, a prescription medicine that acts on GIP and GLP-1 receptors. In the UK it is licensed for type 2 diabetes and, for eligible adults, weight management alongside a reduced-calorie diet and increased physical activity. The NHS explains who may be offered tirzepatide and how it is used. Read the NHS guide to tirzepatide.

Common Mounjaro side effects

The most commonly reported side effects affect the digestive system. These include nausea, vomiting, diarrhoea, constipation and abdominal pain. They are often more noticeable when the dose is being increased, and may ease over time. Tiredness can also occur. The exact pattern varies between people and depends partly on the indication and other medicines being used.

Hair loss and reactions at the injection site, such as redness or itching, are also listed in NHS information. Hair shedding can have several possible causes, including weight change and other health factors. If it is significant, persistent or concerning, speak to your prescriber rather than assuming the cause.

For a full, current list of possible reactions, check the Mounjaro patient information leaflet and ask your pharmacist or prescriber. If a side effect is bothering you or does not settle, the NHS advises speaking to a pharmacist or doctor and continuing your medicine unless they advise otherwise.

When to seek urgent help

Serious reactions are uncommon, but urgent assessment may be needed for symptoms such as severe, persistent stomach or back pain; severe abdominal pain with possible gallbladder symptoms; or signs of a serious allergic reaction, such as swelling of the tongue or throat or difficulty breathing. Low blood sugar is more likely when tirzepatide is used with insulin or certain other diabetes medicines. Follow the advice from your prescriber and the medicine leaflet; in the UK, contact NHS 111 for urgent advice or call 999 for a life-threatening emergency. See NHS side-effect guidance.

Can Mounjaro change your face or skin?

Some people notice a more hollow or drawn appearance, looser skin, or changes in skin texture while losing a substantial amount of weight. These changes can reflect the reduction in overall body fat and how an individual’s skin adapts. Age, genetics, the amount and pace of weight loss, and pre-existing skin and facial structure may also matter.

“Mounjaro face” is an informal phrase, not a diagnosis in the medicine leaflet. It can describe visible facial changes that occur during weight loss, but it does not tell us exactly why they happened in a particular person.

What does the research tell us?

The skin has a thin layer of fat that helps support it. Researchers have suggested that medicines such as Mounjaro might affect this layer, but this idea has not been proven in people taking the medicine.

A 2025 review looked at research into facial changes reported after GLP-1 weight-loss medicines. It found that the available studies were limited, so we cannot yet say exactly what causes these changes. Losing weight can itself change facial fullness, and people are affected differently.

In short, the idea that Mounjaro directly removes fat from the face or changes this layer beneath the skin remains unproven. It should not be presented as a confirmed side effect, and no treatment can be promised to restore lost facial fat or reverse every change linked with weight loss.

What can you do about facial or skin changes?

Start by discussing the timing and extent of your weight loss, any symptoms, and your concerns with the clinician who prescribes your medicine. They can advise on the medicine, nutrition and general health. Do not reduce the dose, pause treatment or stop Mounjaro without their guidance.

If your concern is mainly about facial appearance or skin quality, an individual assessment can help clarify what has changed and whether treatment is appropriate. Options may address different concerns—such as skin texture, laxity or selected areas of volume loss—but no treatment can guarantee restoration of lost facial fat or reverse the effects of weight loss. A doctor should explain likely benefits, limits, risks and costs before you decide.

For a focused guide to facial changes after weight loss and the treatment options a doctor may discuss, read Mounjaro face: causes, evidence and treatment options.

Considering support for skin or facial changes during medication-related weight loss? Visit our GLP-1 weight loss skin treatment guide to see the options a doctor may discuss, including collagen stimulation and carefully selected dermal filler. These treatments are not suitable for everyone; an in-person assessment is needed to discuss benefits, risks and costs.

Riverbanks Clinic’s position

We do not prescribe or supply Mounjaro. We assess skin and facial concerns after weight change and discuss suitable options based on the person’s anatomy, skin quality, health and expectations. Our aim is a considered, natural-looking plan—not a claim to reverse the medicine or restore every area of lost volume.

If you would like a doctor to assess your concerns, request a consultation at Riverbanks Clinic in Harpenden. Please continue to discuss your weight-management medicine with your prescriber.

References and further information

1. NHS. Tirzepatide: medicine information, side effects and advice.
2. Electronic Medicines Compendium. Mounjaro Summary of Product Characteristics.
3. Fabi SG et al. Decoding the Implications of GLP-1 Receptor Agonists on Accelerated Facial and Skin Aging. Aesthetic Surgery Journal. 2024.
4. Daneshgaran G, Shauly O, Gould DJ. “Ozempic Face” in Plastic Surgery: A Systematic Review of the Literature on GLP-1 Receptor Agonist Mediated Weight Loss and Analysis of Public Perceptions. Aesthetic Surgery Journal Open Forum. 2025.

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