How Much Weight Loss Can You Expect on Wegovy?

What does the clinical trial evidence actually show?

The STEP 1 trial is the clearest window we have. It ran for 68 weeks, enrolled 1,961 adults with obesity or overweight plus at least one weight-related condition, and compared semaglutide 2.4 mg against a placebo. Those taking Wegovy lost around 15% of their starting body weight on average; the placebo group lost around 2.4%. Those are averages, which means some participants lost considerably more and some less, but as a benchmark for what the medicine can achieve alongside lifestyle changes, 15% is well-established.

The NICE appraisal of semaglutide (TA875) drew on this evidence when recommending Wegovy for adults with a BMI of 35 or above and at least one weight-related condition, within a specialist weight management service. NICE also notes that treatment should be reviewed if less than 5% weight loss is achieved after six months at the maintenance dose, a useful signal for anyone wondering whether the medicine is working for them personally.

More recently, the higher 7.2 mg dose has shifted what we thought the ceiling looked like. Trials at that dose reported average losses of around 20.7% over 72 weeks, which begins to approach the results seen with tirzepatide. If you want to explore how the two medicines compare head to head, our Wegovy weight loss results page goes through the comparative trial data in detail.

How quickly does weight loss on Wegovy actually begin?

Wegovy is not a medicine that delivers dramatic results in week one. The starting dose, 0.25 mg, is there to help your body adjust rather than to drive significant weight change. Most people begin to feel the appetite-suppressing effects somewhere between weeks two and four, though the visible shift on the scales is usually clearest from around weeks four to twelve as the dose increases and appetite genuinely settles.

A question our prescribers hear regularly is whether early slowness means the medicine is not working. Usually it does not. The titration schedule builds gradually across several months, and weight loss tends to accelerate as higher doses are reached. People who want a sense of what the first few weeks feel like can find a detailed, week-by-week picture on our first week on Wegovy page, and a longer-term timeline on how long it takes to see weight loss on Wegovy.

Patience matters here. A lot of people weigh themselves every morning before the kettle has even boiled, which can make the early weeks feel discouraging. Weekly weigh-ins under consistent conditions give a more reliable picture of the actual trend.

What affects how much weight you lose on Wegovy?

Several things. The dose you reach is probably the biggest single variable: most of the trial weight loss occurred at the 2.4 mg (and now potentially 7.2 mg) maintenance dose, not at the starting 0.25 mg. How closely diet and activity changes are followed alongside the medicine also plays a meaningful role, which is why NICE specifically recommends Wegovy within a programme that includes dietary and behavioural support rather than as a standalone prescription.

Individual biology matters too. Gut hormone sensitivity, baseline weight, age, metabolic health, and medication interactions all influence how a person responds. This is why results vary enough that trial averages, while useful, are not predictions for any one individual. If weight loss slows significantly or stops, that is worth discussing with your prescriber rather than assuming the medicine has simply stopped working. Our page on no weight loss on Wegovy covers the most common reasons progress plateaus and what can be done about it.

For context on private treatment costs, our Wegovy price comparison guide sets out what legitimate private prescriptions typically include and what to look for beyond the headline figure.

Is the weight loss permanent once you stop Wegovy?

This is the question that does not always get a straightforward answer. The evidence suggests that for many people, stopping Wegovy leads to a gradual return of some weight over time, because the medicine's effects on appetite and metabolism are active rather than curative. A study following STEP 1 participants after they stopped treatment found that much of the lost weight returned within a year. That does not make treatment pointless: sustained weight loss during treatment reduces strain on joints, improves cardiovascular markers, lowers blood pressure, and can meaningfully improve quality of life. But it does mean the conversation about how long to stay on Wegovy matters, and that is a decision made between you and your prescriber based on your response and overall health picture.

If you are trying to understand whether Wegovy might be appropriate for you, a consultation with a qualified prescriber is the place to start. You can also read more about what Wegovy involves, including eligibility, on our Wegovy overview page, or explore the full range of weight management options through our treatment options. If you have a clinical question that is not answered here, our team is reachable via our contact page.

Wegovy is a prescription-only medicine. Its suitability, dose, and duration are decided by a clinician, not by the trial averages alone. If you would like a personalised clinical assessment, you can start your free consultation with our prescribers today.