Wegovy expected weight loss by month: what actually happens week by week

Step 1: months one and two, building up, not burning down

The first pen you receive contains 0.25mg of semaglutide. That starting dose is not a therapeutic level in the usual sense; its job is to let your body adjust to the medicine, reducing the chance of nausea and other gastrointestinal effects that are common early on. After four weeks the dose moves to 0.5mg, and then continues upward roughly every four weeks, 1.0mg, 1.7mg, and finally 2.4mg.

During this phase, most people notice their appetite shifting before the scales do. You may feel full more quickly, snack less automatically, and find that the urge to eat past hunger quietly fades. Actual weight loss in months one and two is often modest, sometimes one to three kilograms depending on starting weight and how well appetite has been suppressed at lower doses.

A common misconception worth setting down gently: if the number on the scale barely moves in the first few weeks, some people assume the treatment isn't working. It usually is, the dose just hasn't reached its full effect yet. How long Wegovy takes to show results is genuinely a slower story than the before-and-after images circulating online suggest.

The NHS medicines page for semaglutide explains what to expect during this titration period and when to contact your clinical team about side effects.

Step 2: months three to six, the period of steeper progress

Once the maintenance dose of 2.4mg is reached and the body has settled into it, this is typically when the rate of weight loss accelerates. Trial data from STEP 1 showed that weight reduction continued throughout the active treatment period, but the sharpest monthly falls for many participants occurred in this window.

Practically speaking, people often report losing between one and two kilograms per month during this phase, though this varies significantly. A higher starting BMI, consistent dietary changes and regular physical activity all influence how quickly the kilograms come off. Semaglutide is licensed alongside a reduced-calorie diet and increased activity, the medicine does not do the work alone.

For context on how the broader results picture compares between available treatments, our page on weight loss with Wegovy covers the trial evidence in more depth. If you're also thinking about what treatment costs, the Wegovy price page explains what a private prescription typically involves.

NICE's appraisal of semaglutide for weight management, TA875, notes that patients should be reviewed at six months to assess whether clinically meaningful weight loss has occurred, specifically, less than 5% loss at the maintenance dose is the threshold for reviewing whether to continue.

Step 3: months seven to twelve and beyond, slowing, stabilising

Weight loss typically slows as treatment continues past the six-month mark, not because the medicine stops working, but because the body reaches a new equilibrium at lower calorie intake. This plateau is well documented in the trial literature and is a normal part of long-term treatment.

By twelve months, participants in STEP 1 had achieved close to their maximum weight reduction. The average across the trial was approximately 15% of starting body weight over 68 weeks, which for someone starting at 100kg represents around 15kg. Those at higher starting weights tended to lose more in absolute kilograms, even when the percentage was similar.

The approved Wegovy dose went up to 2.4mg weekly at the time of STEP 1. The MHRA approved a higher 7.2mg maintenance dose from January 2026, with trial data showing around 20.7% average weight loss over 72 weeks at that dose, narrowing the gap with tirzepatide. Specific dose availability is confirmed at consultation.

Understanding the month-by-month shape of this journey matters because it sets realistic expectations. Our overview of expected weight loss with Wegovy sets out the full clinical picture, while the first-month experience page goes deeper into what that initial phase actually feels like. The Wegovy treatment page covers eligibility and how a private prescription works.

If you're ready to find out whether Wegovy is clinically appropriate for you, our prescribers review consultations the same working day. Start your free consultation and a GPhC-registered clinician will assess your situation personally.