Serious Side Effects
- Common (may affect up to 1 in 10 people): Complications of diabetic eye disease (diabetic retinopathy). If you have diabetes, you should inform your doctor if you experience eye problems such as changes in vision during your treatment.
- Uncommon (may affect up to 1 in 100 people): Inflamed pancreas (acute pancreatitis). Symptoms may include severe and long-lasting pain in your stomach (the pain may move to your back). Seek immediate medical attention if you experience any of these symptoms.
- Uncommon (may affect up to 1 in 100 people): Kidney or bladder stones. Symptoms may include back or lower abdomen pain, difficulty urinating or changes in urine colour.
- Rare (may affect up to 1 in 1000 people): Severe allergic reactions (anaphylactic reactions, angioedema). Seek immediate medical attention and inform your doctor straight away if you experience symptoms such as breathing problems, swelling of face, lips, tongue, and/or throat with difficulty swallowing, wheezing, fast heartbeat, pale and cold skin and feeling dizzy or weak.
- Rare (may affect up to 1 in 1000 people): Hip fractures.
- Very rare (may affect up to 1 in 10,000 people): Non-arteritic anterior ischaemic optic neuropathy (NAION) – a medical condition of the eye which may cause loss of vision in one eye without pain. Urgently contact your doctor if you notice sudden or gradually worsening eyesight.
- Not known (the frequency of these side effects cannot be estimated from the data available): Bowel obstruction – a severe form of constipation with additional symptoms such as stomach ache, bloating, vomiting, etc.
Other Side Effects of Wegovy
The other side effects of Wegovy can be categorised as being very common, common or uncommon.
Very common (may affect more than 1 in 10 people):
- Headaches
- Nausea
- Vomiting
- Diarrhoea
- Constipation
- Stomach pain
- Feeling weak or tired
- Upset stomach or indigestion
These symptoms tend to subside over time as your body adjusts to the treatment.
It is important to be aware that diarrhoea or vomiting can lead to dehydration, which may be serious. Make sure to stay hydrated during your treatment and contact your GP or doctor if you experience these symptoms.
Common (may affect up to 1 in 10 people):
- Feeling dizzy
- Burping
- Gas (flatulence)
- Bloating of the stomach
- Inflamed stomach (gastritis) – symptoms include stomach ache, nausea or vomiting
- Reflux or heartburn (also known as gastro-oesophageal reflux disease (GORD))
- Gallstones
- Hair loss
- Changes in the way food or drink tastes
- Changes in skin sensations
- Low blood sugar (hypoglycaemia) in patients with diabetes
The warning signs of low blood sugar may come on suddenly. They can include: cold sweat, cool pale skin, headache, fast heartbeat, feeling sick (nausea) or very hungry, changes in vision, feeling sleepy or weak, feeling nervous, anxious or confused, difficulty concentrating or shaking. Your doctor will tell you how to treat low blood sugar and what to do if you notice these warning signs.
Low blood sugar is more likely to happen if you also take a sulfonylurea or insulin. Your doctor may reduce your dose of these medicines before you start using this medicine.
Uncommon (may affect up to 1 in 100 people):
- Low blood pressure
- Feeling dizzy or light-headed on standing or sitting up (due to a drop in blood pressure)
- Fast heartbeat
- Increased levels of pancreatic enzymes (such as lipase and amylase) in blood
- Delayed emptying of the stomach
- Low blood sugar (hypoglycaemia) in patients without diabetes
- Increased levels of bilirubin in your blood where symptoms include jaundice (yellowing of the skin or eyes)
This is not a complete list of the potential side effects. Always read the Patient Information Leaflet supplied with your medication.
Reporting of side effects
You can report side effects directly via the MHRA Yellow Card Scheme. You can also tell our team, who can report on your behalf.