How much semaglutide should you take for weight loss?

What the STEP 1 trial tells us about effective doses

The clearest picture of how much semaglutide produces meaningful weight loss comes from the STEP 1 trial, published in the New England Journal of Medicine. Over 68 weeks, adults using 2.4 mg of weekly semaglutide alongside lifestyle changes lost an average of around 15% of their body weight, against roughly 2.4% for placebo. That figure (2.4 mg) became the standard maintenance dose under the original Wegovy licence.

There is a common assumption that starting on a higher dose produces faster results. In practice, the titration schedule exists precisely because jumping straight to a maintenance dose causes far more gastrointestinal side effects, and many people abandon treatment as a result. Starting low gives the body time to adjust. If you want to understand how much weight loss semaglutide tends to produce week by week, the trial data gives a more realistic picture than the headline figures alone. The dose that eventually produces meaningful weight loss is the one you can tolerate consistently over months, not the highest one on the label.

In January 2026, the MHRA approved a 7.2 mg maintenance dose for Wegovy, initially delivered as three standard pens weekly and (since April 2026) as a dedicated single-dose pen. Trial data at this level showed average weight loss of around 20.7% over 72 weeks, approaching the results seen with tirzepatide at its highest dose. Whether this dose is suitable for you is a matter for your prescriber; our Wegovy overview covers the current licensed options in more detail.

How UK private pricing reflects the dose you are prescribed

This is where cost and dosing intersect in ways that are worth understanding before you compare prices. Private semaglutide treatment in the UK is typically priced per monthly supply, and the cost changes as the dose increases through titration. Starter doses generally sit at the lower end of the market range; higher maintenance doses cost more.

Since Eli Lilly raised Mounjaro's UK list price in September 2025, the broader GLP-1 private market has seen wider price variation. For semaglutide specifically, reported private prices for Wegovy across UK providers typically range from roughly £149 to £300 or more per month depending on dose and provider, though these figures shift and should be verified directly. Our Wegovy price page holds the most current context.

What those headline figures often exclude is equally important. Consultation fees, prescription charges, delivery costs and any ongoing clinical review for dose increases are frequently listed separately by some providers. A price that looks competitive at the starter dose may look quite different once titration support, repeat prescription fees and delivery are added. Understanding the full cost of a course of treatment (not just the first pen) is the honest comparison to make. For a broader look at what monthly semaglutide treatment actually costs over time, the semaglutide price guide breaks this down.

What a transparent price should include

At nume, one price covers the consultation, the prescription, the treatment itself and free next-working-day DPD delivery. There are no subscription fees, no auto-renewals and no add-on charges for clinical review when your dose changes. We are not the cheapest option in the market — and that is intentional. Running a GPhC-registered pharmacy with genuine same-day clinical review by a named prescriber, photo-ID verification, live weight checks on video and Summary Care Record checks where appropriate costs more to run than an automated questionnaire and a rubber stamp. That cost is built into our price, not hidden in extras.

There are no discount codes, vouchers or promotional pricing at nume. For prescription medicines like semaglutide, codes offered by unknown sellers online are a red flag, not a saving. The MHRA has warned publicly about counterfeit weight-loss pens sold via social media, and some have contained substances other than what was advertised. You can verify any UK online pharmacy on the GPhC register; our registration number is 9012878. If you are researching whether coupon-style offers apply to semaglutide in the UK, the Wegovy coupons page explains this directly.

Why the dose question matters more than the price question

For a prescription-only medicine, the cheapest option is simply the wrong frame. Your prescriber will determine how much semaglutide you should take after reviewing your health history, current weight, any relevant conditions and other medicines you take. Oral contraceptives, certain antibiotics and other drugs taken at the same time as semaglutide can behave differently because gastric emptying slows on treatment, your prescriber needs to know the full picture.

The NICE appraisal of semaglutide (TA875) recommends its use alongside a specialist weight management programme, with a review at six months to confirm meaningful progress. That clinical framework is not bureaucracy, it is how the medicine is used safely. A low price with no clinical oversight attached is not a deal; it is a gap where the oversight should be. If you want to understand how much semaglutide to inject for weight loss at each stage of titration, that page walks through the dosing schedule in detail. If you want to understand how much weight loss to reasonably expect month by month while titrating, this page covers realistic monthly expectations based on the trial data.

Speak to our prescribers through a free consultation, and the dose question gets answered properly, as part of a full clinical assessment, with no charge for the assessment itself.