Overview
This article explains the potential side effects of Wegovy, including very common, common, uncommon, and rare reactions, and provides clear guidance on when to seek medical advice or urgent care. Use this information to understand what symptoms to expect, how common they are, and what actions to take if side effects occur while using Wegovy.
We are here to support you throughout your weight loss journey by offering reassurance and practical guidance on managing side effects.
Understanding Wegovy side effects
Many people use Wegovy safely and successfully. Side effects are most likely to occur:
When first starting Wegovy
When increasing the dose
In most cases, side effects improve or resolve over time as the body adjusts.
Very common side effects (more than 1 in 10 people)
These side effects are common, usually temporary, and often improve with time:
Feeling sick (nausea)
Vomiting
Diarrhoea
Constipation
Stomach pain
Headache
Fatigue
Common side effects (up to 1 in 10 people)
These side effects may occur in some people taking Wegovy:
Dizziness
Indigestion
Heartburn
Bloating
Burping
Flatulence (gas)
Injection site reactions (redness or swelling)
Gallstones
Allergic reactions such as rash, itching, or eczema
Low blood pressure
Hair loss
Changes in sense of touch
Changes in sense of taste
Gastritis (inflammation of the stomach lining)
Eye problems in people with type 2 diabetes
In people with type 2 diabetes, rapid improvements in blood sugar control can temporarily worsen diabetic eye disease (retinopathy).
If you have diabetic eye disease and notice any changes in vision or eye symptoms while taking Wegovy, contact your GP or call 111 for advice.
Uncommon side effects (less than 1 in 100 people)
These side effects occur less frequently but still require attention:
Kidney stones
Increased heart rate
Low blood sugar (hypoglycaemia)
Symptoms of hypoglycaemia
Low blood sugar can occur even in people without type 2 diabetes. Watch for:
Hunger
Dizziness
Tiredness or weakness
Confusion
Anxiety or irritability
Sweating
Shaking
Tingling lips
Heart palpitations
Blurred vision
If these symptoms occur, contact your GP or call 111 for advice.
Serious side effects
Pancreatitis (inflammation of the pancreas)
Pancreatitis is a serious but rare condition. Symptoms may include:
Severe stomach pain that may spread to your back
Pain that does not go away
Severe vomiting that does not settle
Feeling very unwell
Call 999 or go to A&E immediately if you experience these symptoms.
Rare side effects (less than 1 in 1,000 people)
Severe allergic reaction (anaphylaxis)
Signs of a severe allergic reaction include:
Difficulty breathing
Swelling of the lips, tongue, or throat
Difficulty swallowing
Rapid heartbeat
Call 999 or attend A&E immediately if these symptoms occur.
Reporting side effects
If you experience any side effects, whether listed here or not, visit the Weight Loss Guide for guidance on what to do and how to get support.
If you still need help after reviewing the information above, additional assistance is available