How long can you use Wegovy, and what does the evidence say?

What the STEP 1 trial actually measured, and what happened when treatment stopped

The STEP 1 trial ran for 68 weeks, not indefinitely. That framing matters: the ~15% average weight loss figure is a 68-week outcome, and it tells us what is achievable during active treatment. What happened next is just as important for anyone asking how long they should keep going.

A follow-up study tracked participants after treatment ended. Most regained around two thirds of the weight they had lost within a year of stopping. That is not a failure of the medicine, it reflects what we know about obesity as a chronic condition. The body adjusts its hunger hormones and energy regulation in ways that persist well beyond the last dose. Knowing how long you have to use Wegovy shifts the conversation from "when do I stop?" toward "what happens if I do, and am I ready for that?"

If you are wondering when weight loss on Wegovy typically becomes noticeable, the early weeks tend to show the first signs, but sustained results build over months, which is part of why duration matters so much. The full 68-week trajectory in the trial is a better guide than the first few weeks alone.

The NICE two-year rule: what it actually covers

NICE TA875 recommends semaglutide for weight management on the NHS only within a specialist multidisciplinary weight management service, and only for a maximum of two years. That cap exists partly because the longest robust trial data available at the time of appraisal ran to around 68 weeks, and partly because NICE evaluates cost-effectiveness over defined treatment windows for NHS commissioning purposes.

The two-year limit is not a statement that the medicine stops working at month 24. It is a commissioning boundary for NHS specialist services. Private prescribers are not bound by it in the same way, they are bound by the medicine's licence and by their clinical and professional judgment. So if you are asking how long Wegovy can realistically be used for weight loss on a private basis, the honest answer is that it depends on your response, your health goals, and what your prescriber concludes at each review.

NICE also specifies a six-month checkpoint: if someone on the maintenance dose has not achieved at least 5% weight loss by that point, continuing is unlikely to be appropriate. That is a genuinely useful signal, both for clinicians and for patients thinking about whether the treatment is working for them. A look at how long Wegovy typically takes to work can help set realistic expectations for that window.

Long-term use, the 7.2mg approval, and what the evidence is still catching up with

In January 2026 the MHRA approved a 7.2mg maintenance dose for Wegovy. A dedicated single-dose 7.2mg pen followed in April 2026. Trials at 7.2mg reported average weight losses of around 20.7% over 72 weeks, closer to the results seen with tirzepatide 15mg, and substantially higher than the 2.4mg figure. This is a meaningful development for people whose weight loss has plateaued or who are considering whether a higher dose could extend the benefit of treatment.

Long-term data beyond two years for semaglutide at any dose remains limited compared with the wealth of shorter-trial evidence. Cardioprotective effects of semaglutide have been studied in separate trials (the SELECT trial, for instance), but those are distinct from the weight management indication. What the evidence does consistently show is that continuous treatment maintains results in a way that intermittent use does not, so a stop-start approach is generally less effective than a considered, prescriber-led duration plan.

You can read more about the full Wegovy treatment overview if you are comparing the injection with newer options. For context on what treatment costs look like over time, the Wegovy cost guide covers private pricing in detail. And if you are still weighing up which treatment path fits your situation, our treatment overview page sets out what is available.

Having the duration conversation with a prescriber

Many people asking how long they can use Wegovy are really asking something adjacent: am I going to have to take this forever? That is a fair question, and an understandable one. The honest clinical answer is that weight management is ongoing (whether that involves medicine, lifestyle changes, or a combination) and the right duration is one your prescriber arrives at with you, not one imposed by a general rule.

At each repeat order, a clinician reviews your progress. That review is the natural moment to ask about duration, dose, and whether a higher maintenance dose might be appropriate. For anyone thinking about what the first weeks of treatment feel like before those longer conversations happen, the guide to the first week on Wegovy is a useful starting point.

If you are ready to talk through duration alongside suitability and your individual health picture, our prescribers can help. Speak to our prescribers through a free consultation, reviewed the same working day by a GPhC-registered Independent Prescriber.