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What counts as a severe side effect?
Wegovy can cause side effects such as nausea, diarrhoea, vomiting, constipation and stomach pain. These are often mild and may improve over time, but severe side effects need prompt attention.
Seek urgent help if you have trouble breathing, swelling of the face or throat, severe abdominal pain, persistent vomiting, signs of dehydration, or symptoms of an allergic reaction. Any sudden or worrying change after taking Wegovy should be taken seriously.
Stop taking Wegovy and get medical advice
If you think your symptoms are severe, stop taking Wegovy until you have spoken to a healthcare professional. Do not take another dose unless a doctor or pharmacist tells you it is safe to continue.
Contact the clinic or prescriber who supplied your medicine as soon as possible. They can tell you whether your symptoms are likely to be related to Wegovy and what to do next.
When to call 111 or 999
In the UK, call NHS 111 if you need urgent advice but do not think it is a life-threatening emergency. This is a good option if you are unsure whether your symptoms need immediate assessment.
Call 999 or go to A&E straight away if you have chest pain, difficulty breathing, fainting, a seizure, severe allergic reaction, or intense abdominal pain that does not settle. These symptoms may need emergency treatment.
Look out for dehydration and pancreatitis
Severe vomiting or diarrhoea can quickly lead to dehydration. Warning signs include dizziness, confusion, very dark urine, dry mouth, or not passing urine as often as usual.
Wegovy can also rarely be linked with pancreatitis, which may cause severe pain in the upper abdomen that can spread to the back, often with vomiting. This needs urgent medical assessment.
What information should you have ready?
When you speak to a clinician, tell them when you started Wegovy, your current dose, and when your symptoms began. Mention any other medicines you take, including over-the-counter products and supplements.
It also helps to say whether you have eaten or drunk normally, whether you have any allergies, and whether you have other medical conditions such as diabetes. Clear information can help them decide the safest next step.
How to reduce the risk in future
Never increase your dose faster than prescribed, and do not share Wegovy with anyone else. Taking it exactly as directed can lower the chance of severe side effects.
If you are told to restart treatment, ask whether you need a lower dose or a slower increase. Regular follow-up can help make sure Wegovy remains safe and suitable for you.
Frequently Asked Questions
If you have trouble breathing, swelling of the face or throat, chest pain, fainting, severe allergic reaction, signs of pancreatitis, or severe dehydration, seek emergency care right away. Do not wait to see if symptoms improve.
Severe or persistent abdominal pain can be a warning sign of pancreatitis or another serious problem. Stop taking Wegovy until you speak with a healthcare professional and get urgent medical evaluation, especially if the pain spreads to your back or comes with vomiting.
If vomiting is repeated, severe, or you cannot keep fluids down, contact urgent care or a healthcare professional immediately. This can lead to dehydration and may require treatment or a change in your medication plan.
Severe diarrhea can cause dehydration and electrolyte problems. Drink small sips of clear fluids if possible, but seek medical help quickly if you feel weak, dizzy, cannot drink enough, or the diarrhea is severe or persistent.
Signs include very dark urine, not urinating much, dizziness, dry mouth, rapid heartbeat, or confusion. Increase fluids if you can tolerate them, but get medical care promptly if symptoms are significant or worsening.
Call emergency services immediately if you have hives, swelling, wheezing, trouble breathing, or throat tightness. A severe allergic reaction can be life-threatening and needs immediate treatment.
Seek urgent medical care if you have severe upper abdominal pain, pain that goes through to your back, nausea, or vomiting. Pancreatitis is a medical emergency and Wegovy may need to be stopped.
Pain in the upper right abdomen, fever, nausea, vomiting, or yellowing of the skin or eyes can suggest gallbladder problems. Contact a healthcare professional promptly for evaluation, and go to urgent care if the pain is severe.
New blurry vision, eye pain, or sudden vision changes should be evaluated quickly. Stop and seek prompt medical advice, especially if you have diabetes or symptoms are sudden.
Fainting can be caused by dehydration, low blood sugar, or another serious issue. Sit or lie down immediately and get urgent medical help, especially if fainting recurs, you are injured, or you have chest pain or shortness of breath.
Severe constipation, a swollen abdomen, vomiting, or inability to pass gas may indicate bowel obstruction or a serious problem. Seek urgent medical evaluation rather than trying to manage it at home.
If you have shakiness, sweating, confusion, weakness, or a measured low blood sugar, treat it immediately with fast-acting sugar if you are able to swallow safely. Get medical help if symptoms are severe, you pass out, or they do not improve quickly.
Chest pain, palpitations, or a very fast heartbeat should be taken seriously. Call emergency services if the pain is severe, spreads to the arm or jaw, or comes with shortness of breath, sweating, or fainting.
Severe weakness or confusion can be a sign of dehydration, low blood sugar, or another urgent condition. Seek immediate medical care, and do not drive yourself if you feel unwell.
This may be a severe allergic reaction. Call emergency services right away and do not take another dose until a clinician tells you it is safe.
Mild redness can happen, but severe swelling, increasing pain, warmth, pus, or fever may mean infection or another reaction. Contact a healthcare professional promptly for advice and treatment.
If you have severe mood changes, depression, panic, or thoughts of self-harm, seek immediate help from a mental health professional, urgent care, or emergency services. Tell a trusted person right away and do not ignore these symptoms.
If too much Wegovy was taken, or you are unsure about the dose, call poison control or emergency services right away. Watch for severe nausea, vomiting, low blood sugar, dehydration, or fainting, and get urgent evaluation.
Do not take another dose until you have spoken with a healthcare professional if you had a severe reaction. A clinician can help determine whether Wegovy should be stopped, restarted at a different dose, or replaced.
When in doubt, contact urgent care, your prescriber, or emergency services if symptoms are intense, rapidly worsening, or unusual for you. It is safer to get checked quickly than to wait, especially with severe pain, breathing problems, dehydration, or fainting.
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