Wegovy explained: is it the right weight-loss treatment for you?

What Wegovy actually is, and what it isn't

Wegovy is semaglutide sold under a specific brand for weight management. That distinction matters more than it sounds, because the same molecule appears under a different brand, Ozempic, licensed only for type 2 diabetes. They are not interchangeable, and Ozempic is not a route to weight-loss treatment in the UK. If you've seen the two names used loosely online, that's worth untangling before you go any further; our page on how Wegovy and Ozempic differ lays it out plainly.

Mechanically, Wegovy is a GLP-1 receptor agonist. GLP-1 is a hormone your gut releases after eating; the medicine mimics it, which dials down appetite, slows stomach emptying and helps the feeling of fullness arrive earlier and last longer. Many people find they simply want less food, rather than fighting cravings all day. It isn't a fat-dissolving injection and it doesn't work in isolation. The UK licence is explicit that it sits alongside a reduced-calorie diet and increased physical activity, per the NHS guidance on semaglutide.

It's delivered as a once-weekly injection under the skin from a pre-filled pen, into the abdomen, thigh or upper arm, rotating the site each week. The colloquial "skinny jab" tag it sometimes gets undersells what it is: a regulated medicine carrying a Black Triangle for extra MHRA monitoring, with real effects and real cautions. If you want the wider family picture, the semaglutide overview covers the molecule across its brands.

Does Wegovy work, and by how much?

The headline evidence comes from the STEP 1 trial, published in the New England Journal of Medicine. Over 68 weeks at the 2.4mg maintenance dose, which is the standard top dose Wegovy is titrated up to, participants lost around 15% of their body weight on average, far more than placebo. You can read the STEP 1 trial in the New England Journal of Medicine if you want the primary source rather than a summary of it.

Those are trial averages, not promises. Some people lose more, some less, and results depend on the dose reached, how well the medicine is tolerated and the diet and activity changes made alongside it. Weight loss also builds gradually rather than dropping overnight; the early weeks are more about settling in than seeing the scales move, which our page on how long Wegovy takes to work explains in detail.

A more recent development changes the ceiling. The MHRA approved a higher 7.2mg maintenance dose in January 2026, with a dedicated single-dose pen approved on 14 April 2026 for adults with obesity at a BMI of 30 or above. In trials, 7.2mg reported around 20.7% average weight loss over 72 weeks, closing much of the gap with the strongest alternatives. If that top rung interests you, the 7.2mg dose page sets out what's known so far. Whether any specific dose or pen format is right for you, and available, is confirmed at consultation, not decided in advance.

Who Wegovy is licensed for, and who it isn't

The UK licence covers adults with a BMI of 30 or above, or 27 or above where there's at least one weight-related condition such as high blood pressure, high cholesterol, prediabetes, type 2 diabetes or obstructive sleep apnoea. Lower thresholds can apply for people from South Asian, Chinese, Middle Eastern, Black African or African-Caribbean backgrounds, reflecting how weight-related risk shows up at a lower BMI. You can check your figure against the NHS BMI calculator, and our BMI guidance for Wegovy puts those numbers in context.

Meeting the BMI mark is a starting point, not a verdict. BMI alone never guarantees a prescription; a prescriber weighs your full medical history, current medicines and reasons for treatment before deciding whether it's suitable and safe. That's the whole point of a clinical assessment.

Some groups should not use it. It isn't recommended in pregnancy or while breastfeeding, and it isn't suitable if you're trying to conceive; it's also not licensed for anyone under 18. A history of medullary thyroid cancer, MEN2 or previous pancreatitis, and certain gut conditions, all need a proper conversation with the prescriber first. If pregnancy is part of your picture, read our page on Wegovy and pregnancy before anything else, because timing and contraception both matter here.

The side effects worth knowing before you start

Most side effects are digestive and tend to show up when you begin or step up a dose. Nausea is the common one; some people also get diarrhoea, constipation, reflux, burping, tiredness or headaches. These are usually mild to moderate and often ease within a couple of weeks as your body adjusts. The slow dose titration exists precisely to keep that settling-in period gentle rather than rough. Our page on Wegovy side effects goes through the full profile.

There's a rarer but serious risk that deserves naming clearly. In January 2026 the MHRA issued a Drug Safety Update flagging acute pancreatitis as an infrequent side effect of GLP-1 medicines: sudden, severe stomach pain that may spread through to your back, sometimes with vomiting, needs urgent medical attention. It's uncommon, but knowing the sign matters.

Other reasons to seek help promptly include signs of gallbladder trouble, an allergic reaction, or dehydration from prolonged vomiting or diarrhoea. If you're taking the oral contraceptive pill, note that unlike some other GLP-1 medicines, NHS guidance reports no evidence that semaglutide reduces the pill's effectiveness. Anyone can report a suspected side effect through the MHRA Yellow Card scheme, which also feeds ongoing safety monitoring. None of this is meant to alarm you; it's the honest half of the picture that lets you decide with your eyes open.

How to get Wegovy in the UK: NHS versus private

There are two routes, and they run at very different speeds. On the NHS, Wegovy is provided through specialist weight management services under NICE guidance TA875, which recommends it for a maximum of two years within a multidisciplinary service. You can read the framework in NICE's appraisal of semaglutide. Access is genuinely limited, criteria are strict, and waiting lists are commonly long.

The private route is a regulated online pharmacy: a free consultation, a same-day clinical review, and dispensing only if a prescriber judges it suitable. It exists for people who don't meet the tight NHS thresholds, or who don't want to wait months for a specialist referral. If you're weighing up whether to start at all, our broader look at weight-loss treatment options may help you frame it.

Whichever route, the legal position is the same: Wegovy is prescription-only, so no legitimate pharmacy can supply it without a clinical assessment. If you ever see it offered without one, or at a price far below the market, treat that as a warning sign rather than a bargain. The MHRA has repeatedly seized counterfeit weight-loss pens, some of which have contained the wrong drug entirely. You can always confirm a pharmacy is genuine on the GPhC register before handing over anything.

What Wegovy costs, honestly

Private weight-loss treatment in the UK is priced per pen, usually as a monthly cost, and it varies by dose and provider. Any legitimate price should include the prescription and the clinical assessment behind it, not just the medicine in a box. Headline figures you see advertised often leave out consultation fees, delivery and aftercare, so the number on the ad isn't always the number you pay.

We'll be straight about where nume sits: we're not the cheapest, and that's a deliberate choice. Our single transparent price covers the consultation, the prescription, the treatment, free next-working-day tracked delivery and priority aftercare seven days a week, with no subscription and no auto-renewal. Every repeat is clinically re-reviewed rather than rebilled on autopilot. For a fuller breakdown, see our guide to Wegovy pricing.

For a prescription medicine, price is the wrong test to lead with anyway. The questions that actually protect you are whether the supply chain is genuine, whether a real clinician is overseeing your treatment, and whether someone picks up the phone when a side effect worries you. A small saving from an unverified seller is a false economy if what arrives isn't what it claims to be. If you want to compare figures across the market first, our UK price comparison is a fair place to start.

What to eat, and how to live alongside it

Because Wegovy reduces your appetite, the risk isn't overeating, it's under-eating the wrong things. When you're eating less overall, what you do eat has to work harder for you. Protein at each meal, enough fibre, plenty of fluids and some form of strength activity all help you hold on to muscle and feel steadier through the week. Our page on what to eat on Wegovy turns that into practical habits.

Small, regular meals tend to sit better than large ones, especially early on when nausea is more likely. Rich, greasy or very sweet food can make queasiness worse, so many people naturally drift away from it. Alcohol can hit harder too. None of this needs to be joyless; it's more about noticing what your body now tolerates and adjusting rather than forcing old habits onto a changed appetite.

The lifestyle side isn't a footnote to the medicine, it's part of how the medicine is licensed to work. The trial results that make Wegovy worth considering all came from people combining it with diet and activity changes, not from the injection alone. The NHS Better Health weight-loss support offers free tools for the everyday side of that. Treat the medicine as the thing that makes those changes feel possible rather than a substitute for them, and you're using it the way the evidence intends.

Stopping Wegovy, and what happens next

This is the part people ask about least before starting and most afterwards, so it's worth thinking through in advance. Wegovy manages appetite while you take it; it doesn't permanently reset it. When treatment stops, the appetite-suppressing effect fades over the following weeks, and appetite often returns closer to where it was. Some weight regain is common if nothing else changes, which is honest to say rather than reassuring to hide.

That's exactly why the diet, activity and habit changes built during treatment matter so much. They're what carries results forward when the medicine steps back. Stopping should also be a planned conversation, not an abrupt halt, and any dose change is a prescriber decision guided by your response and the patient information leaflet, never something to improvise. Our page on the effects of stopping Wegovy covers this fully.

NICE frames NHS treatment as a maximum of two years for a reason: it's a tool for a defined period, working alongside broader change, not a lifelong dependency by design. Private treatment isn't bound by that two-year cap, but the underlying biology is the same, so the same forward planning applies. Understanding this before you begin makes the whole decision cleaner, because you're choosing a process with a considered end, not just a start. If any of this raises a question specific to you, that's precisely what the consultation is for.

How the consultation works, and why it's built this way

Getting started with nume begins with a free online consultation. A GPhC-registered Independent Prescriber reads your answers personally, the same day, and decides whether treatment is clinically appropriate. Software doesn't make that call; a named clinician does. If you'd like to know who oversees the clinical side, you can read about our lead prescriber.

There are checks that exist to keep you safe rather than to slow you down: photo-ID identity verification, live weight verification on video, and notifying your GP in line with GPhC guidance. Transfer patients provide evidence of current treatment, and dose increases need evidence too. It can feel like more steps than an online purchase, and that's the point; this is a medicine, not a parcel of vitamins. You can read more about how nume works if you'd like the fuller picture.

If you're feeling wary of online pharmacies generally, that instinct is a healthy one, and the answer is to verify rather than to trust blindly. Our pharmacy is registered with the GPhC, medicines are sourced through the licensed UK supply chain, and you can check us on the public register yourself. Order by 12pm on a working day and, once approved, treatment is dispatched the same day for free next-working-day tracked DPD delivery in plain packaging. If you're ready to see whether it fits you, start your free consultation and let a prescriber take it from there.