Week 2 of Wegovy: what to expect as your body adjusts

You have taken your second dose, here is what the next seven days often look like

Picture this: it is Saturday morning, you have just administered your second Wegovy injection, and you are scrolling through forums at 7am wondering whether everything you are feeling is normal. Week 2 tends to feel like a strange in-between, enough has changed to be noticeable, but not enough to feel transformative.

The 0.25mg dose is not a therapeutic weight-loss dose; it exists purely to let your gut and brain adjust to semaglutide before the real titration starts. So if the scales look identical to last week, that is entirely expected. What you are more likely to notice is a subtle shift in your relationship with food: meals feeling satisfying sooner, the mid-afternoon biscuit craving arriving a little quieter, or simply forgetting to think about lunch. Wegovy does take time to build its full effect, and week 2 is still very early days.

Nausea is the side effect patients most commonly report in this second week, particularly in the 12–24 hours after the injection. For many people it is milder than week 1, especially if they have already learned to keep meals smaller and less fatty. Others find it arrives later in the week, almost as a delayed wave. Loose stools, bloating and indigestion also feature regularly. These are part of the typical Wegovy adjustment arc and tend to track downward as your dose stays stable. The NHS medicines page for semaglutide lists the full side-effect profile and is worth bookmarking.

Side effects in week 2: when to ride it out and when to call someone

Most gastrointestinal side effects in week 2 are uncomfortable but not dangerous. Nausea, burping, mild constipation and a tender stomach are the body's response to slowed gastric emptying, semaglutide slows the rate at which food leaves your stomach, which is part of how it reduces appetite. Eating bland, low-fat meals in smaller portions, avoiding large gaps between meals, and drinking water steadily across the day (rather than in large quantities at once) all make a genuine difference.

That said, some symptoms do warrant medical attention rather than patience. Severe stomach pain that does not settle (particularly if it spreads toward your back) needs prompt assessment; the MHRA's Drug Safety Update communications have highlighted acute pancreatitis as an infrequent but serious risk with GLP-1 medicines. Signs of significant dehydration from repeated vomiting or diarrhoea also need clinical input quickly. Mild symptoms: manage with lifestyle adjustments and keep your prescriber informed. Severe or persistent ones: act on them the same day.

If you are taking the oral contraceptive pill alongside Wegovy, the slowed gastric emptying in these early weeks is worth knowing about. Current NHS guidance advises adding a barrier method for the first four weeks of tirzepatide treatment, there is no equivalent specific warning for semaglutide, but if you have any doubts, raising it with your prescriber costs nothing. Our FAQs cover common questions around medicines taken alongside Wegovy.

The numbers game: weight in week 2 and why they can mislead you

It would be dishonest to promise you will see a meaningful number on the scales by the end of week 2. Some people do, particularly if they have made dietary changes alongside starting treatment. Many do not. Both outcomes are clinically normal.

What the trial evidence tells us is that significant average weight reduction emerges over months, not days. The STEP 1 trial, published in the New England Journal of Medicine, recorded roughly 15% average body-weight loss over 68 weeks at the 2.4mg maintenance dose, and week 2 participants were still on the same 0.25mg starter dose you are on now. Week 5 is generally when titration has begun and things start to feel different; reading ahead to week 5 can help set realistic expectations for the coming month.

Water retention changes, bowel habits shifting, and meals being slightly smaller can all show up on the scales in unpredictable ways in week 2. Tracking weight at the same time, same day, same conditions (rather than daily spot checks) gives a far more honest picture. If you came to Wegovy from another treatment and are comparing progress, our page on stalling on Wegovy covers what genuine plateaus look like versus early-weeks noise.

Looking ahead: making week 2 count for the weeks that follow

The habits you build in week 2 tend to set the tone for the whole treatment. Protein at every meal becomes increasingly important as appetite drops, it is easy to eat very little and inadvertently lose muscle rather than fat, which is the opposite of what treatment is designed to support. Staying active, even walking, helps. And if week 1 felt rocky, take heart: for many people week 2 is noticeably more settled.

Think of it a bit like getting a new morning routine started, the first few days feel effortful and odd, and by day ten it has begun to feel ordinary. The pen in the fridge, the injection on the same day each week, the slightly earlier full feeling at dinner: these small rhythms compound into the larger change.

If you are not yet on Wegovy and are still thinking through your options, checking your eligibility with our prescribers is a good next step. Consultations are free, reviewed the same day by a real clinician, and there is no obligation. If you are already on treatment and want to compare what week 2 looked like versus week 1, the week 1 overview is a useful reference point.