As with all medicines, Wegovy may cause some side effects. Mostly, these should be mild and are likely to lessen or even disappear after a few weeks of starting treatment. Your weightloss consultant will advise you on management of these side effects to minimise any discomfort.

The most common side effects with use of Wegovy are gastrointestinal in nature: nausea, vomiting, diarrhoea and constipation. Fatigue and headache are also very common, mainly as doses are increased.Other common side effects include: feeling lightheaded, excess wind (flatulence), development of gallstones, gastroesophageal reflux, injection site reactions, hair loss and hypoglycemia in patients with type 2 diabetes.In rare cases, there can be serious side effects, such as pancreatitis or anaphylaxis.