Wegovy 6 week results: what actually happens in the first six weeks?

Where are you in the dose schedule at six weeks?

Wegovy follows a step-by-step titration designed to reduce the chance of side effects. Treatment opens at 0.25mg weekly for the first four weeks, then moves to 0.5mg. So at the six-week mark, most people have just made that first step up. The 2.4mg maintenance dose (the level at which the STEP 1 trial recorded its headline results) takes around 16 to 20 weeks to reach, assuming the prescriber approves each increase.

This matters when you're looking at the scale at week six. The dose you're currently on isn't the dose the trial was tested at. Expecting 15% weight loss at this point would be like judging a marathon runner at mile three. The full timeline for Wegovy to work is considerably longer than most people anticipate going in, and being realistic about that protects your motivation rather than undermining it.

A question our prescribers hear most weeks: "I've only lost 1kg, is it working?" At six weeks on the titration schedule, yes, that's broadly expected. If you want a sense of what those very first days look like before the pattern becomes clearer, reading about Wegovy 1 week results helps put the early numbers in perspective. Progress before maintenance dose is reached is real but incremental.

What do the trial results actually say about early weeks?

The landmark STEP 1 trial, published in the New England Journal of Medicine, ran for 68 weeks and involved over 1,900 adults. By the end, the 2.4mg semaglutide group had lost an average of around 15% of body weight compared to roughly 2.4% in the placebo group. The trial didn't report granular six-week figures separately, but the weight-loss trajectory in trials like STEP 1 consistently shows a slow early curve that steepens once maintenance dosing is sustained.

What you can reasonably expect at six weeks: some reduction in appetite, possibly a few kilograms of weight loss, and a system still adjusting to the medicine. Some people notice more at this stage; some notice less. Both are within normal range. Individual variation is genuine, body weight, starting metabolic rate, dietary changes and adherence to lifestyle adjustments all shift the curve.

The eight-week picture often looks meaningfully different from the six-week one, simply because more time on the dose allows more consistent appetite suppression to accumulate.

What physical changes are normal to notice at this point?

Side effects during the titration phase are common. The most frequently reported in the STEP 1 trial were gastrointestinal: nausea, constipation, diarrhoea and indigestion. These were generally mild to moderate and most noticeable in the days after starting or stepping up a dose. By six weeks, many people find the 0.5mg dose more comfortable than the initial 0.25mg felt, because the body has had longer to adapt.

Reduced appetite (often described as simply not thinking about food as much) is the mechanism doing the work. Semaglutide acts on GLP-1 receptors involved in appetite regulation and gastric emptying, slowing the rate at which the stomach empties and increasing the sense of fullness after smaller portions. The NHS medicines page on semaglutide covers what to watch for and when to seek help.

If you experience severe or persistent stomach pain that radiates to your back, seek medical attention promptly, this can be a symptom of pancreatitis, which the MHRA has highlighted as a known but infrequent side effect of GLP-1 medicines. Any suspected side effects can be reported via the MHRA Yellow Card scheme.

How should you measure progress at six weeks?

Weight alone is a narrow measure at this stage. Many clinicians recommend tracking waist measurement, energy levels, appetite patterns and how clothes fit alongside the scale, because early changes in body composition aren't always captured by weight. Water retention, muscle mass and digestive changes can all shift what the scale reads on a given day.

It's also worth comparing your week-on-week trend rather than a single weigh-in. A fairly flat week followed by a 1kg drop is a common pattern in early treatment, not evidence of failure. If you're finding the pace hard to read, the four-week marker gives useful context for how the trajectory builds, and looking ahead at what the full Wegovy treatment overview describes for later phases helps set realistic expectations.

For those thinking about the cost of continuing treatment, a plain breakdown is on the Wegovy prices page, useful context if you're weighing up whether to continue privately or explore NHS routes.

If you haven't yet started and are deciding whether Wegovy is the right option for you, speaking to our prescribers is the starting point, same-day clinical review, no referral needed.