How to combat Wegovy side effects and keep going

The first few weeks: what's happening and why it matters

Picture this: you've given yourself the first injection, felt reasonably fine, then hit a wall of nausea by Thursday. That pattern is so familiar that it's become something a question our prescribers hear most weeks, "is this normal, and when does it stop?" The short answer is yes, and usually within one to two weeks of each dose level.

Wegovy slows the passage of food through the stomach. That is partly how it reduces appetite, and it is also why eating a large meal (especially a fatty or heavily processed one) during the first weeks can feel genuinely awful. The simplest adjustment is portion size. Cutting meals by roughly a third, favouring plain proteins and vegetables over fried or rich foods, and eating slowly all reduce the pressure on a stomach that is already working more slowly than usual.

Injection timing can help too. Some people find that injecting in the evening means peak nausea arrives overnight, when they are asleep and less bothered by it. Others prefer morning. There is no single right answer, but experimenting with timing is worth trying before concluding the nausea is unmanageable.

Hydration matters more than it sounds. Nausea suppresses the urge to drink, which then worsens it. Sipping cold water or diluted squash through the day (rather than drinking large amounts in one go) keeps things moving without triggering further discomfort. The NHS patient information for semaglutide covers the common side effects and the circumstances in which to seek medical advice, and it is worth reading before your first dose.

Fatigue, headaches and the less-discussed effects

Nausea gets most of the attention, but fatigue and headaches also appear regularly in the early weeks. Both can partly be explained by reduced calorie intake. If you are eating significantly less without adjusting protein, your body may be running on less fuel than it expects. Prioritising protein at every meal (eggs, fish, chicken, pulses) helps preserve muscle and maintain energy. If headaches arrive, check fluid intake first; they are often a dehydration symptom.

Gas and bloating are a separate category of discomfort that catches many people off guard. Slower gastric emptying changes how food ferments in the gut, and some people find specific foods (cruciferous vegetables, beans, fizzy drinks) make this noticeably worse. Reducing or temporarily removing those foods can bring fast relief. There is a more detailed look at managing this particular side effect on the Wegovy and gas page.

Fatigue specifically is worth tracking. If you feel drained for more than two or three weeks, or if it is severe rather than mild tiredness, flag it with your prescriber. Fatigue that does not settle may point to inadequate nutrition or, less commonly, to Wegovy not being the right fit for you. Managing fatigue on Wegovy deserves its own attention, the strategies there go further than this overview can.

When to get medical help without delay

Managing mild side effects at home is reasonable. There are symptoms, though, where waiting is the wrong call.

Severe or persistent stomach pain, particularly pain that radiates to the back with or without vomiting, needs urgent assessment. In January 2026 the MHRA issued a Drug Safety Update confirming that acute pancreatitis, while infrequent, is a known risk with GLP-1 medicines including semaglutide, the guidance is clear that this symptom pattern should not be managed at home. The MHRA Drug Safety Update index holds that communication alongside the broader safety record for this class of medicine.

Other symptoms requiring prompt attention include: signs of gallbladder problems (sudden pain in the upper right abdomen, fever, jaundice); severe dehydration from persistent vomiting or diarrhoea; symptoms of a serious allergic reaction such as facial swelling, difficulty breathing, or a widespread rash; and any significant change in mood, including low mood or thoughts of self-harm.

If you are unsure whether a symptom warrants a call, it usually does. Contact your prescriber, call 111, or go to A&E depending on severity. The Yellow Card scheme at yellowcard.mhra.gov.uk allows you to report any suspected side effect directly to the MHRA, this is valuable data for ongoing medicine monitoring and you do not need a doctor to submit a report.

Building a routine that makes side effects easier to live with

Most people who stick with Wegovy find side effects are at their worst in weeks one to four, then gradually improve. A consistent routine is one of the most underrated tools for getting through that window.

Keeping the injection on the same day each week, eating at regular times, and logging symptoms helps you spot patterns, a food that reliably causes trouble, or a meal timing that makes nausea worse. That information is exactly what your prescriber needs if a dose review becomes relevant.

Our prescribers at nume discuss side-effect management as part of every consultation, not as an afterthought. If you are weighing whether Wegovy is the right treatment or want to understand how the process works before committing, the Wegovy overview covers the full picture. For a broader look at how to reduce side effects beyond the early weeks, stopping Wegovy side effects from derailing your treatment picks up from here. And if you want to compare how the side effect profile sits alongside the clinical results, understanding the cost of private Wegovy treatment is a useful next step when you are ready to think about starting.

If you are ready to speak to a clinician, check your eligibility through a free consultation with one of our prescribers.