How Much Weight Can You Lose a Week on Mounjaro?

What does the trial data actually show week by week?

Asking how much Mounjaro delivers per week is a question our prescribers hear most weeks — and the honest answer is that the trial data gives averages, not timetables. In SURMOUNT-1, participants lost roughly 20–21% of body weight over 72 weeks at the 15 mg dose. Work that back and it comes to somewhere around 0.5–1 lb per week on average. But the curve isn't flat. Early weeks can bring faster initial loss as the body responds to reduced appetite; later months tend to slow as you approach a new set point. Some weeks the scale barely moves; others it shifts noticeably. None of that means treatment isn't working.

Dose matters too. Treatment starts at 2.5 mg (a level designed to let your system adjust rather than to drive weight loss) and is titrated upward by the prescriber over several months. The higher the tolerated dose, the greater the average weight reduction seen in clinical evidence. If you're curious how outcomes shift across the full dose range, the overall Mounjaro weight-loss evidence page covers that in detail. Weekly figures only make sense once you know which dose and which point in treatment you're comparing.

Tirzepatide, the medicine in Mounjaro, is a dual GIP and GLP-1 receptor agonist, the only medicine of its kind currently licensed in the UK for weight management. That dual mechanism is why trial results sit above earlier single-pathway medicines. It slows gastric emptying and reduces appetite through two distinct hormonal signals, per the NHS tirzepatide medicines page.

Does the price you pay have anything to do with how much you lose?

Not directly. What price buys you in a private weight-loss service is clinical rigour, genuine supply chain and structured support, none of which shows up on a weekly-loss graph, but all of which determine whether the medicine you receive is the real thing, prescribed appropriately, and reviewed regularly enough to keep your titration on track.

UK private Mounjaro pricing has changed significantly since Eli Lilly revised its list price in September 2025. Reported private prices now range roughly £149–£375 per month depending on dose and provider, as widely reported following Lilly's announcement. That range exists because providers price differently, and because what some headline figures include varies a great deal. A quoted monthly price may or may not cover the consultation, the prescription fee, clinical review before each repeat, aftercare access, or delivery.

Understanding how Mounjaro is priced in the UK means looking past the per-pen number to what surrounds it. A price that looks lower on paper can end up costing more once consultation and delivery fees are added at checkout.

What does a legitimate Mounjaro price actually include?

At nume, the price is one number. It covers the consultation, the prescription, the treatment, and next-working-day DPD delivery, nothing is added at the end. We're not the cheapest option on the market; that's deliberate. Clinical oversight at each stage costs something, and we think it's the part that matters most. You can see exactly what's included on the treatment page.

There are no subscription auto-renewals here. Every repeat order gets the same same-day clinical review as the first, a real prescriber reads your answers, not software. If a dose increase is requested, evidence is checked. That process is part of why the medicine works as well as it does: titration done properly, at the right pace, by someone who's looked at your individual picture. Our clinical team oversees every prescription personally.

For context on how GLP-1 treatment costs compare across the options available in the UK, the GLP-1 cost comparison page is a useful starting point.

Why is 'cheapest' the wrong question when you're comparing weekly results?

The cheapest listing online might be counterfeit. The MHRA has warned publicly about fake Mounjaro pens sold through social media and unverified websites, including pens found to contain insulin rather than tirzepatide, which caused serious harm. In October 2025, enforcement teams raided the first UK site manufacturing counterfeit tirzepatide pens. If a product carries no requirement for a clinical assessment before purchase, that's the clearest possible red flag. You can verify any online pharmacy on the GPhC register before handing over personal or payment details.

For a prescription medicine, the useful question isn't which provider charges least. It's whether the medicine is genuine, the dose is right for you, and the clinical support is there if something changes. Those three things have a direct bearing on how much weight loss you can expect week to week on Mounjaro, and over the full treatment course. Understanding how much you should realistically lose each week on Mounjaro helps set expectations before you begin. Weekly progress is the outcome; safe, supervised treatment is what produces it. Start by checking your eligibility with our prescribers.