What Actually Happens in Your Second Week on Wegovy

Are the side effects you're feeling in week two normal?

For most people, nausea is the dominant experience in the first two weeks of Wegovy. It tends to arrive a few hours after an injection and can last a day or two. The good news is that this pattern usually improves as the body adapts — week two is rarely worse than week one, and many people find it noticeably easier. Loose stools, constipation, burping and a general sense of queasiness round out the common picture, with fatigue and mild headaches less frequently reported.

These effects are well-documented in clinical studies of semaglutide. The NHS semaglutide medicines page lists them as expected and notes they are typically mild to moderate, settling as treatment continues. Eating smaller meals, choosing bland foods over rich or fatty ones, and staying properly hydrated all help. Lying down straight after eating tends to make nausea worse.

A small number of people experience injection-site redness or mild itching. Rotating sites properly (and letting the pen warm to room temperature before injecting) reduces this. If you are unsure about technique, the Wegovy injection guide walks through each step.

Urgent medical attention is needed for severe, persistent stomach pain that travels to the back, with or without vomiting. This can be a sign of pancreatitis, which the MHRA highlighted in a January 2026 Drug Safety Update as an infrequent but serious risk with GLP-1 medicines. If that pattern of pain develops, stop the injection and seek help promptly rather than waiting to see if it passes.

Should you expect any weight loss in the second week?

Probably not much, and that is expected. The 0.25mg dose that covers your first four weeks of treatment is a tolerability dose; its job is to help your gut adapt, not to produce significant appetite suppression yet. Some people notice they feel full faster or that their interest in food has dropped slightly, and that can lead to a modest reduction in calorie intake without any deliberate effort. But a dramatic number on the scales in week two is not what the clinical programme was designed to deliver at this point.

Meaningful weight reduction in Wegovy trials accumulated over months. The STEP 1 trial, published in the New England Journal of Medicine, followed adults on 2.4mg semaglutide for 68 weeks and recorded an average body-weight reduction of around 15%. That outcome was built across many months of titration, not the first fortnight. Looking ahead, the Wegovy week-by-week guide sets out what to expect as doses increase over the coming months.

If the scales haven't moved at all by week two, that tells you very little about how treatment will go. Conversely, if you've lost a kilogram or more, it's worth thinking about whether you're eating enough protein and drinking enough water, appetite suppression without deliberate attention to nutrition can occasionally tip into inadequate intake.

How does week two compare with what comes next?

Weeks one and two sit in the same dose period: the first 0.25mg pen covers four weekly injections before your prescriber typically steps the dose up to 0.5mg at week five. Side effects that feel significant now are at their most predictable point in the journey; the titration steps that follow bring a fresh round of adjustment, usually milder than the first.

People who find week two difficult sometimes wonder whether Wegovy is simply not for them. That's a reasonable question to sit with, but the clinical picture suggests that most people who persist through the initial adjustment period find weeks five, six and seven considerably easier. The week five guide covers the first dose increase, and week six is when many people report that the treatment starts to feel more settled. If you'd like a longer horizon, the second month of Wegovy is where many people begin to notice more consistent appetite changes.

The cost of treatment over time is a practical question many people raise around now. A guide to Wegovy pricing in the UK explains how private prescription costs break down and what to watch for when comparing providers. As with any prescription medicine, the cheapest listing is rarely the right yardstick, clinical oversight, genuine supply chain and ongoing prescriber support matter as much as the headline figure.

When is it worth contacting your prescriber during week two?

There's a fairly short list of things that genuinely warrant a call or message rather than a wait-and-see approach. Severe or persistent vomiting that prevents you from keeping fluids down is one: dehydration compounds the side effects and can strain the kidneys. Severe stomach pain of the type described above is another. Any sign of an allergic reaction (swelling of the face or throat, difficulty breathing, a widespread rash) needs emergency help, not a prescriber message.

For everything else, the timing of your weekly injection sometimes matters more than people realise. Injecting on a consistent day, at a time when you're less likely to be planning a big meal, makes the first 24 hours easier to manage. Some people settle on a Thursday evening so that any rough patch lands over the weekend rather than a working day; others prefer a Sunday so the medication has settled before Monday. That choice is yours, though it's worth deciding before the kettle goes on for your second Sunday brew.

The nume FAQs answer several common week-two questions. If you haven't started treatment yet and are weighing up whether Wegovy is right for you, the full Wegovy overview sets out the evidence, eligibility and how to access it through a regulated private pharmacy. Side effect concerns reported directly to the regulator go via the MHRA Yellow Card scheme, which is open to patients as well as clinicians.