Wegovy before and after 3 months: what actually changes

Step 1, weeks 1–4: the body adjusts, not the weight

The first four weeks on Wegovy are dominated by one thing: settling your system into the medicine. The starting dose of 0.25mg has no therapeutic weight-loss target. Its job is to reduce the GI side effects that would otherwise make titration miserable, nausea, loose stools, a persistent low-level queasiness that tends to peak around the third or fourth day after each injection.

Most people notice their appetite softening during this month, sometimes sharply. Portion sizes that felt normal suddenly feel too large. Whether that translates to measurable scale movement in week four depends on starting weight, how consistent the lifestyle changes are, and individual metabolism. Some people are down a kilogram or two; others barely move. Both are normal at this stage.

A practical check worth doing right now: weigh yourself on the same scales, at the same time of day, ideally before breakfast. A consistent baseline makes the three-month picture far more readable than a scattered set of different-time readings. One reading a week is plenty.

Step 2, weeks 5–12: dose increases and the appetite floor

By the second month, most people have moved to 0.5mg and, if tolerated, are approaching 1.0mg. This is where appetite suppression deepens. The overview of how Wegovy works explains the GLP-1 mechanism in more detail, but in practical terms: food becomes less compelling, meals feel satisfying sooner, and the mental chatter about snacking quietens.

Weight loss in months two and three tends to accelerate compared with month one, not because the medicine suddenly starts working, but because the dose is higher and the lifestyle changes have had time to embed. For many people, the 5–8% average loss figure for the three-month window emerges here. That is 4–6kg for someone starting at 80kg, or around 6–9kg for someone starting at 110kg. Meaningful, but not the headline number you see quoted for the full treatment course.

Side effects remain most common after each dose increase. Nausea, constipation and fatigue are the ones reported most. They usually settle within a week or so. If symptoms are severe or persistent, that is a conversation for your prescriber, not something to push through alone. You can explore the longer-term picture in our six-month results guide for context on where things are heading.

Step 3, what the numbers mean in context

Three months is a staging post, not the destination. The STEP 1 trial, published in the New England Journal of Medicine, followed participants for 68 weeks on a 2.4mg maintenance dose, the bulk of that 15% average weight loss came after people had been on a stable maintenance dose for several months. Three months in, many participants had not yet reached 2.4mg.

That framing matters if you are three months in and wondering whether the treatment is working. Progress at this point is real and clinically meaningful, a 5% reduction in body weight is associated with measurable improvements in blood pressure, blood glucose, cholesterol and joint load. But it is the beginning of the curve, not the plateau.

How your own trajectory compares to the trial average is something to discuss with your prescriber. If weight loss has stalled completely before reaching the maintenance dose, that is worth flagging. If it is moving but slower than expected, patience and consistent lifestyle habits are usually the answer. The guide on how long Wegovy takes to work covers the full timeline in more detail, including when to consider whether a dose change is appropriate.

For a broader look at what the prescription process involves, our treatment overview explains the private route from consultation to dispensing. If you are comparing results at different timepoints, the two-month picture and the four-month picture sit either side of this window and show how the trajectory develops.

One last note on cost context: if you are weighing up whether to continue, it helps to understand what is included in a private prescription service. Our Wegovy cost guide sets out what different providers typically include and what is sometimes left out. For treatment that is clinically reviewed at every repeat, with no subscription and free next-working-day delivery, start a free consultation with our prescribers to see whether Wegovy is appropriate for you. NHS guidance on semaglutide and what to expect is also available via the NHS semaglutide medicines page.