Why Wegovy Has Stopped Working — and What Comes Next

Step 1: Recognise what a plateau on Wegovy actually means

A lot of people feel a quiet, deflating frustration when the number on the scales stops moving after weeks of steady progress. That feeling makes complete sense. But in most cases, a stall is not the same as the medicine ceasing to work.

Semaglutide reduces appetite by activating GLP-1 receptors that signal fullness to the brain and slow gastric emptying. Over time the body adjusts its metabolic rate to match the lower calorie intake, and weight loss naturally decelerates. This is documented across the trial data, in the STEP 1 trial published in the New England Journal of Medicine, average weight loss was around 15% over 68 weeks, but the rate of loss was not linear: it slowed substantially in the second half of treatment. A plateau around months 6 to 12 is the norm, not an exception.

The broader question of whether Wegovy stops working over time is worth reading alongside this page, because the answer differs depending on whether you mean a temporary plateau or a complete loss of response.

So the first thing to do is distinguish a genuine stall from a natural slowdown, and then look at why the stall is happening.

Step 2: Check whether your dose is still appropriate

Wegovy is prescribed on a gradual titration schedule, starting low and increasing every four weeks or so as tolerated, up to a 2.4 mg weekly maintenance dose. If semaglutide seems to have stopped working for you, one of the most common explanations is that the current dose is below where it needs to be to sustain appetite suppression effectively.

Some people tolerate the lower doses with minimal side effects and assume there is no need to increase. Others pause a planned increase after a difficult week and then never restart the climb. Both are understandable, but the appetite-regulating effect is dose-dependent, a 1.0 mg dose will not produce the same result as 2.4 mg, and the titration exists for a reason.

The NHS semaglutide patient information outlines the standard schedule and explains why the dose steps matter. If you are below 2.4 mg and weight loss has slowed, talk to your prescriber before assuming the medicine itself has reached its ceiling.

The patterns seen when Wegovy weight loss has stopped are worth checking if you want to compare your situation more closely.

Step 3: Audit the lifestyle factors that blunt the medicine's effect

Semaglutide is prescribed alongside a reduced-calorie diet and increased physical activity, that wording in the licence matters. The medicine lowers appetite, but it does not override the energy balance entirely, and several specific habits can erode its effect over time.

Ultra-processed foods are worth looking at first. They are engineered to override satiety signals, and some people find their appetite gradually creeps back when their diet contains a high proportion of them, even on a full maintenance dose. Protein adequacy matters too: adequate protein at each meal extends the feeling of fullness and helps preserve muscle mass during weight loss, which protects your resting metabolic rate. It is also worth thinking about specific foods in your diet, including whether something like bananas fits well with how Wegovy works, as some everyday choices are worth a closer look. If calories have gradually drifted upward (sometimes called the quiet regain that feels like the medicine failing) a short food-diary period can make this visible.

Sleep disruption is less commonly discussed but is clinically relevant. Poor sleep raises ghrelin (the hunger hormone) and lowers leptin, partially counteracting the appetite suppression the medicine provides. Stress has a similar effect through cortisol.

None of this means willpower has failed. Biology is stubborn. But it does mean a conversation with your prescriber about these factors is more productive than simply waiting.

Step 4: Know when a clinical review is the right next step

NICE's guidance on semaglutide for weight management (referenced in NICE technology appraisal TA875) includes a clear review point: if less than 5% of body weight has been lost after 6 months at the maintenance dose, continuing should be reconsidered in discussion with a clinician. That is a meaningful clinical threshold, not an arbitrary rule.

If my Wegovy stopped working and I had been at the full maintenance dose for six months with minimal response, a prescriber would typically explore whether a different treatment might suit me better. Tirzepatide, for example, acts on two gut-hormone receptors rather than one; you can read about how the treatment options compare for a factual overview.

For people who have temporarily stopped Wegovy, restarting is not straightforward, appetite can return rapidly, and the re-titration process needs clinical guidance. The section on what happens when you stop taking Wegovy covers this in detail.

If you are asking why semaglutide stopped working for you specifically, the honest answer is that it usually takes a clinical review to find out. A prescriber can look at your dose history, weight trend, current lifestyle and any relevant health changes to give you a grounded answer rather than a generic one. If you would like that conversation, start your free consultation with our prescribers and it will be reviewed the same day by a real clinician, not a chatbot.