How much weight do you lose in the first week of Wegovy?

What the trial data says about early weight loss on Wegovy

The STEP 1 trial is the most cited evidence on semaglutide for weight management, and it's instructive precisely because it focuses on long-term outcomes. Over 68 weeks, participants on 2.4 mg semaglutide lost around 15% of body weight on average. That figure is not front-loaded. The NHS medicines page for semaglutide confirms that treatment begins at 0.25 mg, a dose selected to help the body adjust, not to produce rapid loss. The schedule moves upward roughly every four weeks, guided by your prescriber, before reaching 2.4 mg maintenance. At that starter dose, appetite suppression is mild. Gastric emptying slows a little; the hormonal signalling that reduces hunger builds over time. So in the first seven days, many people notice their appetite is slightly different but their weight has barely shifted. That is normal and expected.

Some people do see a few hundred grams drop in week one, partly from reduced calorie intake and partly from fluid changes that accompany any dietary change. But if you step on the scales on day seven and see little movement, that tells you nothing useful about your long-term response. Weekly averages over the full treatment period paint a far more reliable picture than a single early reading. Worth knowing before you start.

Why first-week expectations directly affect how people think about cost

This matters to pricing conversations because a common pattern runs like this: someone starts Wegovy, sees no dramatic loss in week one, feels the monthly cost is hard to justify, and stops. That decision is understandable, but it misreads the evidence. The meaningful results in STEP 1 emerged between months two and twelve, after titration reached therapeutic doses. Stopping at week two is, clinically, stopping before the treatment has properly started.

Private Wegovy treatment in the UK is priced per month and varies between providers. Wegovy's UK pricing shifted considerably after Eli Lilly's 2025 list-price increase affected the wider GLP-1 market; reported private rates for semaglutide now typically range from around £149 to over £300 per month depending on dose and provider, though these figures are approximate and move. Any legitimate quoted price should include a prescription and clinical assessment, if it doesn't, ask what you're actually paying for. Understanding exactly what a Wegovy injection costs across different doses helps you budget for the titration period, not just week one. That context changes the calculation significantly.

What an all-in price actually includes, and what headline numbers can hide

Quoted monthly prices across the market often reflect the medicine only. Consultation fees, prescription charges, delivery costs, and any clinical support between orders can each add to the total. Some services charge separately for dose-increase reviews or aftercare messages. A headline that looks lower than average may simply be pricing those elements as extras.

At nume, one price covers the free consultation, the prescription, the medicine, tracked DPD delivery the next working day, and seven-day-a-week priority aftercare. Every repeat order goes back through clinical review, not a checkbox form, but a prescriber reading your notes. We're not the cheapest option on the market, and that's deliberate. The infrastructure behind safe, supervised treatment costs money to run properly. Our clinical team reviews each consultation personally, and there are no subscriptions or auto-renewals rolling in the background. You order when you're ready, we review before we dispatch. Full stop.

One quick check worth doing: any online pharmacy you consider should appear on the GPhC pharmacy register. Takes under a minute. If you can't find them there, stop.

The right question to ask isn't how much you lose in week one

For a prescription medicine, the lowest price is the wrong thing to optimise for. The question is whether you're getting genuine medicine through a regulated UK supply chain, reviewed by a real clinician who can adjust your treatment if something isn't right. Counterfeit GLP-1 pens have been seized in large quantities across the UK, the MHRA has issued multiple public warnings about fake pens sold via social media and unverified websites, some containing insulin rather than semaglutide. Those sellers typically have one thing in common: no prescription process. Sellers offering Wegovy or any weight-loss injection without a clinical assessment are operating outside the law, full stop.

If you're weighing up whether the cost is worth it before you've seen results, the honest answer is that week one won't settle that question. The first month tells a more useful story, and realistic expectations for that window are better grounded in the trial evidence than in early-week scales. If you want a closer look at how much people typically lose on Wegovy in the first month, the evidence gives a clearer steer than anything week one can offer. Understanding the full Wegovy treatment picture (how titration works, what the evidence says at each phase, and what clinical oversight involves) makes it much easier to judge whether any service's pricing represents genuine value. Exploring your treatment options before committing is exactly the right move.