Not Losing Weight on Wegovy: Why It Happens and What to Do

Step 1, Check whether you're actually at a dose that's doing the therapeutic work

The 0.25mg starting dose exists to help your body adjust, not to produce weight loss. The same is true of the 0.5mg and 1.0mg steps. This matters because people sometimes measure progress during the titration phase and conclude the medicine isn't working when they haven't yet reached a dose that's pharmacologically likely to suppress appetite significantly. How long Wegovy takes to work depends heavily on where you are in the titration schedule.

A practical check you can do in under a minute: look at the pen you're currently using and confirm which dose it contains, then count how many weeks you've been at that specific step. If you're still on 0.25mg or 0.5mg, the honest answer is that the medicine hasn't yet had a fair chance to show what it can do at therapeutic levels.

For people on Wegovy, the standard maintenance dose has been 2.4mg once weekly, titrated roughly every four weeks under prescriber guidance. The full Wegovy overview explains the dose journey in more detail. Dose decisions belong with your prescriber, but knowing where you are in the schedule helps you ask the right questions. The NHS patient information for semaglutide outlines the titration steps and what to expect at each one.

Step 2, Audit the factors that blunt appetite suppression without your realising

Semaglutide slows gastric emptying and reduces appetite, but several common habits can quietly undermine it. Eating fast overrides satiety signals before they arrive, the fullness cue comes 15 to 20 minutes after you've already put down the fork. Liquid calories (fruit juice, sugary coffee drinks, alcohol) pass through quickly enough that semaglutide's slowing effect offers almost no protection against them.

Sleep is less obvious but well-documented: poor sleep raises ghrelin, the hunger hormone, and blunts satiety signalling, partly counteracting what the medicine is doing. Chronic stress acts through cortisol in a similar way, driving cravings independent of true hunger.

If you're on Wegovy and not losing weight despite being at a maintenance dose, a careful look at these four areas (eating speed, liquid calories, sleep quality, and stress patterns) often reveals something adjustable. None of this means you've failed; it means biology is more layered than a simple dose-and-wait model. People asking why they're on Wegovy but not losing weight frequently find at least one of these factors playing a larger role than expected.

Step 3, Distinguish a genuine plateau from normal fluctuation

Body weight fluctuates by 1–3 kg day to day depending on hydration, sodium intake, menstrual cycle phase, and bowel habit. A reading that looks flat across two or three weeks may not be flat at all when those variables shift. Weighing yourself at the same time of day, on the same day each week, after the bathroom, before eating, is the most reliable way to track a true trend rather than noise.

A genuine plateau (no net change over six to eight weeks despite consistent effort and an appropriate dose) is different. That's worth raising with your prescriber. Sometimes a dose review is appropriate; sometimes the conversation is about realistic expectations for your particular body composition and starting point. If you want a thorough look at the reasons this can happen, our guide on not losing any weight on Wegovy walks through the most common causes and what you can do about them.

NICE guidance for semaglutide (TA875) recommends reviewing continuation if less than 5% weight loss has occurred after six months at the highest tolerated maintenance dose. That's a clinical threshold, not a verdict on you, it's an evidence-based decision point. NICE's appraisal of semaglutide (TA875) sets this out formally.

Why weight loss stalls on Wegovy is a question our prescribers hear regularly, and the answer is rarely one single cause.

Step 4, Consider whether the medicine or the dose is the right fit for you

Not everyone responds the same way to semaglutide. Genetic variation in GLP-1 receptor expression is one reason; gut microbiome differences are another. If you're genuinely not losing weight on Wegovy after a sustained period at the right dose, it may be that a different mechanism would work better for you rather than more of the same.

Tirzepatide, the active ingredient in Mounjaro, works on two receptors (GIP and GLP-1) rather than one, and the SURMOUNT-5 head-to-head trial (published in the New England Journal of Medicine in 2025) showed it produced greater average weight reduction than semaglutide 2.4mg over 72 weeks. That doesn't mean it's automatically the right choice for everyone, but it means there's a clinically meaningful alternative conversation to have.

There is also a cost dimension worth understanding. If you're paying privately and not seeing results, the Wegovy price comparison page sets out what different options cost, so you can have an informed conversation about value. For a broader look at weight-loss treatment options (including how different medicines compare) our treatment overview is a useful starting point before your next prescriber conversation.