Wegovy seems to have stopped working — here's what the evidence says

The biggest misconception: 'it's stopped working'

The most common thing people say after several months on Wegovy is that the medicine has 'worn off'. It's understandable, the dramatic early weight loss levels out, appetite starts to feel more like its old self, and the scales barely move for weeks. If you've been experiencing this, our page on what to do when Wegovy has stopped working covers the practical steps in detail. Semaglutide is still active and still binding to GLP-1 receptors; what's changed is the gap between where your body used to be and where it is now.

When you lose a significant amount of weight, your resting metabolism adjusts downward. The calorie deficit that produced steady loss in month two produces a smaller deficit in month six, simply because there's less of you. This is well-documented physiology, not a product flaw. The STEP 1 trial, published in the New England Journal of Medicine, showed that the largest weight reductions happened in the first 20–28 weeks of treatment, with a slower plateau phase afterwards, even in participants still taking the full 2.4mg maintenance dose. A plateau at that point is the expected shape of the curve, not a deviation from it.

Separate from metabolism, tolerance to the satiety signal can also develop. Many people notice that nausea fades after the first few dose increases. The same adaptation means the 'full very quickly' sensation can become subtler over time. Food intake can quietly creep back toward old patterns without any conscious decision. If you're not sure whether that's what's happening to you, our page for people who feel like Wegovy has stopped working can help you work out whether the medicine is truly less effective or whether something else is going on. One question our prescribers hear regularly: 'Could my portions have got bigger without me noticing?' Quite often, yes.

What actually drives a plateau on semaglutide

Several things tend to converge around months four to six of treatment. Understanding which ones apply to you matters, because the response is different in each case.

Calorie drift is the most common. As nausea recedes and appetite adapts to lower food volumes, portion sizes gradually normalise. If you're curious about whether this is happening, the NHS Better Health resources at nhs.uk/better-health/lose-weight include practical tools for reviewing your eating patterns without obsessive tracking.

Activity levels often fall as the initial motivation peaks. Weight loss itself can also change how much energy day-to-day movement burns: a lighter body uses fewer calories climbing the same stairs.

Sleep and stress have a direct hormonal effect on appetite regulation, and both can undercut semaglutide's action. Poor sleep raises ghrelin (the hunger hormone) and cortisol, which work against the appetite suppression the medicine provides.

Dose and duration are clinical questions. If you haven't yet reached the maintenance dose, there may be room to increase. If you've been on a stable dose for many months, a prescriber may want to review whether your current dose is still appropriate. You can find more on how these decisions are made on our page about why weight loss can stall on Wegovy and what options exist.

Distinguishing a plateau from a genuine loss of response

A true loss of response (where semaglutide simply stops producing any effect) is far less common than a plateau, but it does occur in some people. Signs that distinguish it from an ordinary slow phase: appetite returning fully to pre-treatment levels (not just slightly), no change in the rate of gastric emptying (you feel hungry very soon after eating), and weight actively regaining rather than just not falling further.

If any of those ring true, it's a reason to speak with a prescriber promptly rather than to simply wait it out. A review might consider whether the dose can be increased, whether something else is interfering (certain medications and health changes can reduce efficacy), or in rare cases whether a different treatment pathway is more suitable. Our overview of whether Wegovy stops working covers the evidence on long-term response in more detail.

One thing that does predictably end Wegovy's effect: stopping it. Research consistently shows that weight returns relatively quickly after discontinuation. If you're considering stopping because progress has stalled, it's worth raising that with a prescriber first, the decision is more nuanced than it might seem, and there is a separate page exploring what happens when you stop taking Wegovy that may help you frame the conversation.

What to actually do if your weight loss has stalled

The honest answer is that a conversation with a prescriber is more useful than any article. That said, a few practical things are worth doing before that appointment. Keep a rough record of what you've eaten for a week, not to judge yourself, but to spot the drift. Note your sleep hours and stress levels. Check whether anything in your routine has changed since the weight loss slowed. That information will make the prescriber review far more productive.

For those wondering about cost and whether it's worth continuing, the Wegovy treatment page sets out what private treatment includes; it's also worth knowing that stopping and restarting generally means beginning the titration schedule again, which extends the time before you're back at a therapeutic dose.

At nume, every repeat order is clinically re-reviewed by a prescriber before it's dispensed, so if something has changed in your response, that's the right moment to flag it. The review happens the same working day. If a change to your treatment plan is appropriate, our team can discuss that properly rather than just reissuing the same prescription. You can also read more about our clinical approach or reach out directly through the contact page if you have questions before starting. When you're ready, the best next step is to start your free consultation and speak with a prescriber who can look at the full picture.