Why Is Wegovy Not Working for Me — and What to Do About It

Step 1: Work out where you actually are in the dose schedule

The first thing worth doing (right now, in under a minute) is checking which pen you are currently on. Wegovy is titrated gradually: 0.25mg, then 0.5mg, then 1.0mg, then 1.7mg, and finally 2.4mg, with roughly four weeks at each level before moving up. The lower doses exist primarily so your digestive system can adjust; they are not intended to produce large weight changes on their own.

If you are on 0.25mg or 0.5mg and wondering why Wegovy is not working, the honest answer is that you have not yet reached the dose at which the medicine was shown to be effective in trials. The STEP 1 trial, which underpins the medicine's licence, reported an average body-weight reduction of around 15%, but that was measured after 68 weeks at the 2.4mg maintenance dose, alongside lifestyle support. The STEP 1 trial paper, published in the New England Journal of Medicine, is the primary evidence base the medicine's recommendations rest on.

People who feel their Wegovy is not working are often comparing week three at 0.5mg against a headline number that took over a year to produce. That is not a fair comparison. Give the dose schedule time, and speak to your prescriber before assuming the medicine itself is the problem.

For a detailed look at typical timelines, our page on how long Wegovy takes to work sets out what to expect at each stage.

Step 2: Think honestly about what is happening with food and activity

Semaglutide reduces appetite signals. It does not, by itself, choose what you eat or how much. A quieter appetite only translates into a calorie deficit if eating behaviour actually changes alongside it, and for some people, highly palatable foods (very sweet, very salty, very fatty) can still feel easy to eat even when hunger is reduced.

This is not a willpower question. Biology is complicated. But it does mean that if your daily intake has not shifted much since starting treatment, the medicine will have less to work with. The NHS guidance on weight-management injections notes that lifestyle changes (eating patterns and physical activity) are expected to run alongside treatment, not be replaced by it.

A few things worth considering: protein intake, which helps preserve muscle during weight loss and tends to increase satiety; fibre, which slows digestion; and hydration, because thirst is sometimes read as hunger. None of this requires a complicated plan. A conversation with a dietitian, or your prescriber, can help you identify the one or two practical shifts most likely to make a difference for you specifically.

You can also read more about what typical weight loss on Wegovy looks like across the dose range, which may help set a more realistic benchmark.

Step 3: Consider whether something else is working against the medicine

Several factors can reduce how effectively semaglutide works, and a prescriber is the right person to review these properly. The most common ones worth knowing about:

Thyroid function. An underactive thyroid makes weight loss harder regardless of what medicine you take. If yours has not been checked recently, it is worth raising.

Sleep. Poor sleep raises levels of the hunger hormone ghrelin and reduces the satiety hormone leptin. Consistently short or broken sleep can meaningfully undercut the appetite-suppressing effect of GLP-1 medicines.

Other medicines. Some antidepressants, antipsychotics, corticosteroids and insulin-stimulating diabetes medicines promote weight gain or resist weight loss. If you take any of these, tell your prescriber, switching or adjusting may be possible.

Stress. Chronic stress elevates cortisol, which promotes fat retention, particularly around the abdomen, and can drive eating behaviour independently of hunger.

The NHS patient information on semaglutide covers the medicine's known interactions and conditions that affect its use, a useful reference to read before your next review. There is also a broader conversation to be had about whether semaglutide is the right medicine for you at this point: our page on why semaglutide might not be working for you looks at this from a slightly wider angle, and if Wegovy specifically is the focus, our guide to Wegovy not working covers the most common reasons in detail.

Step 4: Know when to bring your prescriber in

Some situations call for a formal review rather than waiting it out. If you have been on the full 2.4mg maintenance dose for at least six months and have lost less than 5% of your starting body weight, that is a recognised clinical threshold. NICE's guidance on semaglutide (TA875) explicitly notes that continuing treatment should be reconsidered at that point, not because the medicine has failed you as a person, but because the clinical picture needs reassessing.

That reassessment might mean looking at the factors above more carefully. It might mean considering whether a different medicine, such as tirzepatide, would be a better fit, there is direct head-to-head evidence from the SURMOUNT-5 trial suggesting tirzepatide produced greater average weight loss than semaglutide 2.4mg in adults with obesity. You can explore both options on the Wegovy overview page and compare them on the weight-loss treatments page.

It might also simply mean a conversation about what is realistically achievable and what support would help most. If you have not had a clinical review for a while, that is the natural starting point. A prescriber who knows your full picture, including your history, current medicines, and how treatment has gone so far, is far better placed than any checklist to tell you what comes next.

If you are thinking about starting afresh with a full clinical review, our free consultation connects you with a GPhC-registered prescriber who will look at your situation properly and the same day.