Wegovy Not Working the Way You Expected? Here's Why That Happens

You're six weeks in, the scale hasn't moved, and you're wondering what's wrong

This is a question our prescribers hear most weeks, and it almost always comes down to where someone is in the titration schedule. Wegovy starts at 0.25mg, a dose designed to let your body adjust, not to produce measurable weight loss. The 0.5mg and 1.0mg levels that follow are stepping stones, not destinations. The dose where the STEP 1 trial recorded an average weight reduction of around 15% over 68 weeks was 2.4mg, the maintenance level, and most participants didn't reach it until around month five. If you're still in the first few months and feeling that Wegovy is not working for you, the honest answer is that you may not yet be at the dose where it's supposed to.

Progress can also look uneven. Some people lose little in the first four weeks at a new dose, then drop a noticeable amount in weeks five and six as the medicine settles. Plateau periods (sometimes two to four weeks of no change) are a normal physiological response, not a sign of failure. The body adjusts its energy expenditure to resist further loss, a well-documented mechanism entirely separate from the medicine. Understanding how long Wegovy takes to work at each stage helps put early results in the right frame.

If you want a broader picture of the treatment itself, the Wegovy overview on our site covers the full licensed pathway, how the medicine works and what the evidence shows across different populations.

What can genuinely slow semaglutide's effect, even when you're taking it correctly

Semaglutide reduces appetite and slows gastric emptying; it does not override the other things that shape weight. Several factors are worth examining if your progress has stalled. Protein intake matters more on this treatment than off it, the appetite suppression can make it easy to eat too little overall and too little protein specifically, which accelerates muscle loss and slows the metabolic response. Sleep debt raises the hormones that drive hunger (ghrelin) and lowers those that signal fullness (leptin), partially counteracting what semaglutide is doing. Chronic stress has a similar effect through cortisol.

Medication interactions are another practical consideration. Some antidepressants, antipsychotics, corticosteroids and insulin-stimulating medicines are associated with weight gain or resistance to loss; if you take any of these, your prescriber needs that information to interpret your progress accurately. The semaglutide not working page goes into more detail on the pharmacological factors that can reduce the medicine's effect.

Injection technique is worth reviewing too. Rotating between the abdomen, thigh and upper arm correctly, avoiding areas of scar tissue, and storing the pen refrigerated until use all affect how consistently the medicine is absorbed. The NHS provides patient-level guidance on semaglutide use that's worth reading alongside your Patient Information Leaflet, the NHS semaglutide page covers practical administration advice as well as what to expect.

When slow progress becomes a clinical conversation, and what NICE says

The formal clinical benchmark is set out in NICE's guidance on semaglutide (TA875): if someone loses less than 5% of their body weight after six months at the highest dose they can tolerate, continuing treatment should be reconsidered. That threshold exists because the medicine genuinely doesn't produce meaningful results in a small subset of people, and staying on it indefinitely without progress isn't the right approach. If you feel you might be in that group, the right next step is a prescriber review, not stopping abruptly or switching medicines on your own.

It's also worth considering whether the dose you're currently on is as high as it's been, there's a specific pattern of Wegovy 1.0mg not working as expected that turns out to be normal, because 1.0mg is a mid-titration rung rather than the end point. And for some people, slow weight loss on Wegovy isn't failure; it's the shape their response takes, often with continued loss at a lower rate over many months. NICE's appraisal of semaglutide for weight management is available at nice.org.uk/guidance/ta875 for anyone who wants to read the full evidence review.

If you're weighing whether Wegovy remains the right option for you (or whether a different approach might suit your situation better) it's worth looking at what's available. Our weight-loss treatments page sets out the licensed options alongside each other, which can make that conversation with a prescriber more focused. For context on what private treatment typically costs and what a legitimate price should include, the Wegovy price comparison page covers that clearly.