When will Wegovy start working — and what does progress actually look like?

The first week: your pen is in the fridge, and you're watching for something to change

It is completely normal to feel impatient at this stage. You've started at 0.25mg, the injection is done, and now you're waiting. The first thing most people report is subtle: meals feel sufficient a little sooner than usual, or the pull towards a second helping is quieter. That is semaglutide working on GLP-1 receptors in the brain and gut, slowing gastric emptying and adjusting the signals that tell you when you've had enough. It is not dramatic. Some people feel nothing at all in week one beyond mild nausea, which tends to settle within a few days.

What you won't see yet is the scale moving much. Early changes on the balance may reflect water and glycogen shifts rather than fat loss, and reading too much into them either way tends to be unhelpful. The NHS patient information for semaglutide is clear that the full effect builds over many months, not days. If you're wondering when Wegovy starts working and what to expect as the weeks progress, the answer is more gradual than most people anticipate; the 0.25mg starting dose is deliberately modest, designed to protect you from the worst of the side effects rather than to produce rapid loss.

For a more personal sense of how other timelines unfold, the experiences people share are genuinely varied, our guide on when Wegovy started working for different people reflects that range honestly.

Weeks four to twelve: when the real signal starts to appear

By the time you move up to the 0.5mg dose, and then to 1mg, appetite suppression becomes more consistent. This is the phase where most people begin to notice the scale shifting with some regularity, not every day, but across the weeks. Semaglutide's effect on gastric emptying means food sits in the stomach longer, which has a practical outcome: smaller portions become genuinely satisfying rather than just aspirationally so.

Clinical trial data from the STEP 1 study, published in the New England Journal of Medicine, showed an average weight reduction of around 15% over 68 weeks at the 2.4mg maintenance dose. The steepest part of that curve sits in roughly months two through six, so if weeks four to twelve feel slower than you hoped, they are still part of the productive window. Protein intake, hydration and some form of resistance activity all support what the medicine is doing; your prescriber or a dietitian can advise specifically for your situation.

Nausea, if it hasn't already faded, usually eases as your body adapts to each dose level. If you want to understand more about the physical sensations that accompany this early phase, it helps to know what feeling Wegovy working actually means, appetite changes and mild GI symptoms are both normal parts of the picture.

Months three to six and beyond: reaching maintenance and what the evidence says

The titration schedule continues to 1.7mg and then 2.4mg, each step roughly four weeks apart at minimum, guided by your prescriber. Once you reach and settle at 2.4mg, you are on the maintenance dose where the trial evidence was generated. From here, weight loss continues (more slowly than earlier, but steadily) for most people who stay on treatment.

The MHRA-approved 7.2mg dose, confirmed in April 2026 via a dedicated single-dose pen, offers a higher maintenance option for adults with a BMI of 30 or above, with trial data suggesting around 20.7% average weight loss over 72 weeks at that dose. Whether that option is appropriate is a clinical decision; availability of specific doses is confirmed at consultation.

NICE guidance (TA875) notes that if less than 5% weight loss has occurred after six months on the maintenance dose, continuing treatment should be reviewed. That threshold is a clinical checkpoint, not a verdict, it exists so that people who are not responding have their treatment reconsidered rather than continued indefinitely without benefit. You can read more about realistic timelines for how soon Wegovy starts working in different circumstances, which covers factors like starting weight, metabolic history and dose progression. Our overview of Wegovy as a treatment option explains the full licensed pathway for the UK, including the eligibility criteria that a prescriber applies.

If you are in the process of getting Wegovy (or wondering whether it is the right fit for you) a good starting point is understanding how Wegovy is obtained lawfully in the UK. Every legitimate supply requires a prescription following clinical assessment; there is no shortcut to that, and a prescriber who reviews your medical history is what makes the medicine safe as well as effective. At nume, a GPhC-registered prescriber reads your consultation personally, not software, and any approved treatment is dispatched the same day via tracked next-working-day delivery. You can explore what that process looks like on our weight-loss treatment page.