What are the side effects of Wegovy?

Wegovy is a powerful weight-loss medication, but as with any medicine, side effects may occur. In this blog, you can read about which side effects may occur, when they usually appear, and how Goodweigh supports you in ensuring a safe and comfortable treatment. If you’d like to read more about how this medicine works first, you can find more about Wegovy on our product page.

Which side effects are most common?

The most common side effects of Wegovy are gastrointestinal complaints. Nausea is by far the most frequently reported complaint: the STEP 1 study shows that over 44% of users experienced this to some extent, compared to 16% in the placebo group. Diarrhoea occurred in approximately 30% of participants, vomiting in 25% and constipation in 24%. In addition, some users report headaches and fatigue, particularly in the first few weeks of treatment. Hair loss occurs in around 2.5% of users. This is almost always telogen effluvium, a temporary form of hair loss in response to physical changes, which usually resolves on its own. A slight increase in heart rate has also been observed, averaging around three extra beats per minute.

When do most side effects occur?

The side effects are most noticeable in the first few weeks of treatment, and this is no coincidence. Wegovy is started at a low dose of 0.25 mg per week and then increased every four weeks until the maintenance dose of 2.4 mg per week is reached. With each new dose increase, the body may temporarily react again with nausea or other gastrointestinal symptoms. Safety research shows that this gradual titration schedule is specifically designed to make the side effects as tolerable as possible. For most people, the symptoms noticeably subside after a few days to weeks.

Are there any rare or serious side effects?

Although the majority of users experience only mild to moderate symptoms, rare but serious side effects have also been reported. Clinical research published in The Lancet shows that acute pancreatitis, gallstones (cholelithiasis) and cholecystitis can occur, albeit rarely. In exceptional cases, acute kidney failure has been reported, almost always as a result of severe dehydration caused by persistent vomiting or diarrhoea. In people who are also taking insulin, there is an increased risk of severe hypoglycaemia. Anaphylaxis and intestinal obstruction are extremely rare but are listed in the official product information from the European Medicines Agency. Wegovy is contraindicated in people with a history of pancreatitis, severe kidney or liver failure, type 1 diabetes and during pregnancy.

How can you alleviate mild side effects?

Mild side effects are unpleasant, but for most people they are manageable with a few practical adjustments. Eating smaller meals, chewing more slowly and avoiding high-fat or strongly spiced foods helps with nausea. For more advice, read our page on what is best to eat whilst taking Wegovy. Drinking plenty of fluids is essential, especially if you have diarrhoea or are vomiting, to prevent dehydration. Constipation usually responds well to a higher-fibre diet and exercise. It is also helpful to schedule the injection at a fixed time each week, so that any symptoms become predictable and you can plan accordingly.

What should you do if you experience severe symptoms?

If you have persistent, severe abdominal pain radiating to your back, stop injecting immediately and contact a doctor or GP. This also applies to symptoms of a severe allergic reaction, such as swelling of the lips, tongue or throat, or signs of dehydration. Please also read our page on using Wegovy safely for an overview of situations where you need to take action. If in doubt, it is always wise to contact your healthcare provider, even outside of your regular check-ups.

Do the side effects go away on their own?

For the vast majority of users, the answer is yes. Researchers conclude that gastrointestinal symptoms with Wegovy are typically temporary and are most pronounced at the start or following a dose increase. Once the dose is stable, the body gets used to the medicine and symptoms decrease substantially in most people. Long-term research published in Nature Medicine shows that people who stick with the treatment also achieve the greatest weight loss, which underlines that persevering is worth it in most cases.

How does Goodweigh support you with Wegovy side effects?

At Goodweigh, you’re not on your own. Our doctors and coaches actively support you throughout the entire treatment, even if you experience side effects. Through support from Goodweigh, you have access to personalised advice on dose adjustments, lifestyle and nutrition. If a side effect persists or feels too severe, we will discuss together whether to delay the next dose increase or adjust the approach. That is precisely the difference compared to treatment without support: there is always someone available to help you work through it.

Starting Wegovy safely, with support from Goodweigh

For many people, side effects are part of the initial phase of treatment, but they are manageable and temporary in nature. The gradual titration schedule, combined with the right lifestyle advice and active medical support, means that most people tolerate the treatment well. If you have questions about the difference compared to a similar medication, please also read our article on the difference between Ozempic and Wegovy. At Goodweigh, we guide you step by step so that you can work towards a healthier weight safely and comfortably.

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