Still gaining weight on Wegovy 2.4mg? Here's what's actually going on

Is your body actually gaining fat, or is something else shifting the number?

The first question worth asking is what the weight gain actually represents. The scale measures total mass: fat, muscle, water, gut contents, and more. A sudden 1–2 kg rise after a weekend away or a salty meal is almost always fluid retention, not fat accumulation. Similarly, if you have recently started strength training alongside Wegovy, small increases in muscle tissue are both expected and desirable. Resistance exercise on semaglutide is actively encouraged, partly because preserving lean mass during rapid weight loss is one of the harder problems the medicine doesn't solve on its own.

True fat gain while taking a therapeutic dose of semaglutide is less common, but the NHS medicines information for semaglutide acknowledges that individual response varies. Before drawing any conclusions, track weight at a consistent time (first thing in the morning, after the bathroom, before food) across at least two weeks. A single alarming reading is rarely the full story.

That said, if the upward trend is consistent across several weeks, treat it seriously and contact your prescriber.

What might be driving genuine weight gain at 2.4mg?

Semaglutide works by slowing gastric emptying and reducing appetite signals, but it does not override every factor that influences body weight. Several things can push back hard enough to outweigh the medicine's effect.

Compensatory eating patterns. As nausea from the earlier doses settles (which it usually does by 2.4mg) appetite can return more than expected. Some people find they overcorrect, eating more freely than they realised once the GI discomfort fades. This is worth discussing with a dietitian rather than trying to tough out.

Concurrent medications. Certain antidepressants (particularly mirtazapine and some SSRIs), antipsychotics, corticosteroids and some hormonal treatments carry weight gain as a documented side effect. If any of these were started or had their dose changed around the time the scales shifted, your prescriber needs to know. They may be able to review alternatives or adjust the overall plan.

Thyroid or other hormonal changes. An underactive thyroid can develop at any age and is one of the commoner reversible causes of unexpected weight gain. A simple blood test rules it out. This is not something to self-investigate; raise it with your GP or the prescriber managing your Wegovy treatment.

Reduced activity. Wegovy does not maintain weight loss independently. If your movement levels have dropped significantly (illness, a desk-heavy winter, or a longer-than-planned recovery from an injury) the calorie balance can shift even while appetite suppression continues. For context on what the maintenance dose can realistically deliver, the evidence on weight loss at 2.4mg shows an average reduction of around 15% over 68 weeks in clinical trials, with lifestyle changes running alongside the medicine throughout.

Does weight gain mean the 2.4mg dose isn't working for you specifically?

Not necessarily, but it might. Response to semaglutide follows a bell curve: most people in the STEP 1 trial lost meaningful weight at the maintenance dose, but a meaningful minority lost less than 5%, and a smaller number saw no loss or a slight gain. NICE's recommendation for semaglutide (TA875) explicitly states that continuing treatment should be reviewed if less than 5% weight loss is achieved after six months on the maintenance dose. That review is a clinical conversation, not a self-managed decision to stop or continue.

If you never lost weight at 2.4mg and are now gaining, that is worth a frank conversation about whether semaglutide is the right treatment for you, or whether tirzepatide (Mounjaro) might suit you better. The difference in response between doses is well documented, and the question of whether higher doses produce meaningfully greater results is one our prescribers work through regularly. On the other hand, if you lost weight steadily and have recently started regaining, that is a different clinical picture, often linked to one of the lifestyle or medication factors above, and frequently addressable.

For a fuller picture of how the dose ladder works and what each step is designed to achieve, the guide to Wegovy's dosing schedule explains the purpose behind the titration.

What should you actually do next?

Contact your prescriber. That sounds obvious, but it is genuinely the correct first step, not something to delay until the next scheduled review. Bring a record of your weight over the past few weeks, any medication changes, and an honest account of dietary patterns and activity. The more specific the information, the more targeted the response can be.

If you are managing Wegovy through a private service, check that ongoing clinical oversight is part of what you are paying for. Our frequently asked questions cover how aftercare works at nume, and our clinical team is available seven days a week for exactly these conversations. For anyone weighing up the broader cost of running treatment through a clinically supervised service, the Wegovy cost breakdown explains what responsible private prescribing typically includes.

The medicines involved here, semaglutide included, are prescription-only treatments requiring an active prescribing relationship, not a one-off transaction. If you are not currently getting that level of support, it may be worth reviewing who is overseeing your care. A fresh clinical assessment is a good place to start: it costs nothing to check your eligibility and discuss your situation with a real prescriber.