How long do you have to be on Wegovy — and what happens when you stop?

Does Wegovy work indefinitely, or does it stop working over time?

Semaglutide does not stop working in the way that some people expect. The common misconception is that the body "gets used to" the medicine and weight loss stalls entirely after a year or so. What actually happens is different: weight loss tends to be steepest in the first six to twelve months, then slows as your body reaches a new equilibrium, not because the medicine has lost effect, but because the biology of weight regulation means the deficit between intake and expenditure narrows as you lose mass. Most people on the 2.4 mg maintenance dose see continued, if more gradual, benefit beyond that initial window.

The STEP 1 trial, published in the New England Journal of Medicine, followed participants for 68 weeks and recorded an average body-weight reduction of around 15% at 2.4 mg. What that trial also showed (in the withdrawal extension) was that participants who stopped semaglutide regained roughly two-thirds of that lost weight within a year. That finding has shaped clinical thinking profoundly: for many people, Wegovy behaves more like a long-term treatment for a chronic condition than a short course with a defined end point. How long you have to stay on Wegovy is, in practice, often answered by what happens if you come off it.

The newer 7.2 mg dose, approved by the MHRA in April 2026 for adults with a BMI of 30 or above, reported around 20.7% average weight loss over 72 weeks, narrowing the gap with tirzepatide results. Whether that higher dose changes the long-term duration picture is still being established.

What does NICE actually say about how long you can stay on Wegovy on the NHS?

The NICE technology appraisal TA875 recommends semaglutide (Wegovy) for use within specialist weight management services for a maximum of two years. That cap applies specifically to NHS commissioning: it reflects the conditions under which NICE assessed the cost-effectiveness of the medicine, not a clinical ceiling on how long the drug is safe or licensed to use. If less than 5% weight loss has occurred after six months at maintenance dose, the guidance says treatment should be reconsidered.

Private prescribing sits outside that two-year NHS limit. Here, the licensed indication and the SmPC govern: semaglutide is authorised for weight management in adults with a BMI of 30 or above, or 27 or above with at least one weight-related condition, alongside a reduced-calorie diet and increased activity. There is no fixed stop date written into the licence. Duration becomes a clinical judgement: is the medicine still producing meaningful benefit? Is it well-tolerated? Has the patient's situation changed? Those questions are answered at each clinical review, not decided once at the start.

At nume, the question of how long to stay on Wegovy comes up at every repeat review. A real prescriber looks at your progress each time, not a system that auto-renews.

What happens to your weight if you stop Wegovy?

This is the part most people wish they had been told upfront. Stopping semaglutide does not lock in the weight you have lost. For the majority of patients, appetite regulation reverts relatively quickly once the medicine clears the body, semaglutide has a half-life of roughly one week, so the hormonal signalling it supports fades within a few weeks of the last dose. Hunger tends to return, and without the continued appetite suppression, many people find weight creeps back.

How quickly and how much depends on several factors: how embedded lifestyle changes have become, how long the person was treated, metabolic factors, and whether any of the underlying conditions driving weight gain have changed. There is no reason to feel this reflects a personal failing, the science of how semaglutide works makes it clear that it is managing a biological system, not curing it. That said, some people do maintain meaningful weight loss after a planned, supervised stop, particularly those who have made substantial and lasting changes to their eating and activity patterns during treatment.

Planning a stop is a conversation for your prescriber, not a solo decision. Abrupt stopping carries no specific medical danger, but a managed taper or a planned exit strategy (with lifestyle support in place) tends to produce better long-term outcomes. You can explore the upper limits of Wegovy treatment duration in more detail if that is where you are in your thinking.

How do the early months compare to the longer term, and when should you expect results?

Patience in the first weeks of Wegovy is not wasted. The titration schedule (starting at 0.25 mg and stepping up over several months) exists to reduce gastrointestinal side effects, not to produce immediate weight loss. Results at the starter dose are modest by design. How quickly Wegovy starts working is a question worth reading about separately, but the short answer is that meaningful weight loss for most people becomes apparent from around month two or three, with the most significant changes typically seen between months three and nine.

For people who want a practical sense of what the first thirty days look like, first-month experiences and female-specific first-month results give a grounded picture. The clinical data points to most of the headline weight loss occurring within the first 52 weeks, after which a lower but sustained rate continues, provided the dose is maintained and lifestyle changes are in place. That trajectory matters when you are thinking about how long you need to be on Wegovy: stopping at month three, before the medicine has reached its full effect, gives a very different outcome to a planned twelve-month course followed by a prescriber-supervised review.

If you are weighing up the right path for your situation, our treatment overview covers the options available, and speaking to our prescribers through a free consultation is the right next step.