Is Wegovy Safe to Take?

Wegovy contains the active substance semaglutide, a GLP-1 receptor agonist. It acts on appetite-regulating pathways in the brain and slows gastric emptying, which is how it supports weight management. Like all medicines, it carries a range of known effects and considerations that your prescriber will have taken into account when recommending it.

Commonly reported side effects

The most frequently reported side effects are gastrointestinal — nausea, vomiting, diarrhoea, constipation, and indigestion are all commonly noted, particularly early in treatment or after a dose increase. These often ease over time as the body adjusts. Headache, fatigue, dizziness, and injection-site reactions are also reported by some people. None of this means every person will experience them, and severity varies considerably.

If any side effect feels severe, persistent, or worrying to you, contact your healthcare professional promptly rather than waiting it out.

Special circumstances that need extra care

Certain situations require particular caution and should always be discussed with a prescriber:

• Pregnancy and breastfeeding: Wegovy is not recommended during pregnancy or while breastfeeding. If you become pregnant, are planning to conceive, or are breastfeeding, speak to your prescriber or doctor straight away — do not continue or stop the medicine without their guidance. You may also find the page on GLP-1 medicines and pregnancy useful for broader context.
• Teenagers and younger people: Suitability for people under 18 is determined on a case-by-case basis by a prescriber; it is not a blanket yes or no.
• Thyroid concerns: People with a personal or family history of certain thyroid conditions should have discussed this with their prescriber before starting.
• Pancreatitis and gallbladder issues: These are listed as conditions requiring clinical attention. If you experience persistent, severe abdominal pain, seek medical help promptly.
• Mental health and mood changes: Some people report mood changes; this is worth logging and discussing with your healthcare professional.

Wegovy carries a black-triangle designation

As a relatively recently authorised medicine, Wegovy is subject to additional monitoring in a number of countries. This means that reporting side effects is especially encouraged — through your national reporting scheme (such as the UK's Yellow Card scheme or an equivalent in your country) and directly to your healthcare professional. According to the electronic Medicines Compendium (eMC), the full prescribing information and patient leaflet contain the complete list of effects and contraindications — your prescriber will have reviewed these in the context of your health.

For a broader look at how semaglutide and tirzepatide compare in terms of mechanism, see the page on whether Wegovy and Ozempic are the same medicine, or read more on what Wegovy is and how it works.

One of the most practical things you can do while taking Wegovy is keep a clear record of how you feel — not to self-diagnose, but so that when you do speak with your prescriber or doctor, you have something concrete to share rather than relying on memory.

GLP Trackr's side-effect tracker is built exactly for this. You can log symptoms as they happen — nausea, fatigue, mood changes, injection-site reactions, or anything else that feels relevant — and the app surfaces patterns over time. Did nausea cluster in the first two days after each dose? Did energy dip at a particular point in the week? That kind of insight is genuinely useful to bring to a prescriber appointment, and it is far easier to spot in a log than to reconstruct from memory weeks later.

The app also includes a doctor report feature, which pulls together your tracked data into a clear summary you can share at consultations — useful for any safety-related conversation with your healthcare team. You can also use the progress tracking tools to understand how your journey is unfolding alongside any side effects you are managing.

GLP Trackr is not a substitute for clinical guidance. Any concern about whether Wegovy is safe for you — whether that relates to a new symptom, a change in circumstances, pregnancy, or anything else — should be directed to your prescriber or doctor, who knows your full history. The app helps you record what is happening so that conversation is as informed as possible.

For more on how GLP-1 medicines work in the body, the guide to how GLP-1 medicines work covers the underlying mechanisms in plain language.

Want to start logging how you feel on Wegovy? GLP Trackr is free to try for 7 days — available on the App Store and Google Play, with no commitment required.