Slimn
Consultation
Tirzepatide2 hormones · GIP + GLP-1Once weekly

Mounjaro

A once-weekly injection that helps reduce appetite and control cravings, prescribed and supported by UK clinicians.

From£250/mo
Start ConsultationAm I eligible?
Mounjaro injection pen
Clinically proven results

Lose up to 22.5% of your body weight*

In a 72-week clinical trial, people who stayed on the highest dose of Mounjaro lost an average of 22.5% of their body weight, alongside a reduced-calorie diet and more exercise.

Average body weight changeIllustrative trend
0%−22.5%Week 0Week 24Week 48Week 72
72 weeksClinical trial length
Once weeklyOne injection a week
The science

How Mounjaro works

Its active ingredient, tirzepatide, mimics two natural gut hormones — GIP and GLP-1 — that tell your body when you've had enough to eat.

  • Signals fullness to your brain

    Helps quieten hunger signals, so you feel satisfied with less food.

  • Slows digestion

    Food leaves your stomach more slowly, so you stay full for longer after eating.

  • Steadies blood sugar

    Helps your body release insulin when blood sugar rises, keeping levels steadier after meals.

  • Two hormones, one injection

    The first medicine to act on both GIP and GLP-1 receptors, taken just once a week.

Dosing

What is the dosing schedule for Mounjaro?

You start on the lowest dose and step up gradually, usually every 4 weeks, so your body can adjust. Each strength comes in its own colour-coded pen.

You don't have to reach the highest dose

If a dose is working well, your prescriber may keep you on it. Doses only go up if you're tolerating the medication.

  1. 2.5 mg
    Starting dose
    Weeks 1–4
  2. 5 mg
    Maintenance option
    Weeks 5–8
  3. 7.5 mg
    Weeks 9–12
  4. 10 mg
    Maintenance option
    Weeks 13–16
  5. 12.5 mg
    Weeks 17–20
  6. 15 mg
    Maintenance option
    Week 21+

Shown at the earliest pace — each step lasts at least 4 weeks. Your prescriber sets your schedule, and 5 mg, 10 mg and 15 mg are the usual maintenance doses.

Frequently Asked Questions

Yes — these are prescription medicines, not supplements. A UK-registered prescriber reviews the medical information you give us, and a prescription is issued only where they judge the treatment to be appropriate and safe for you.

Treatment pairs a weight-loss medication that helps curb your appetite with the everyday changes that make the results last — regular activity and better nutrition. The medication gives you a foundation to build those habits on, rather than replacing them.

Once your questionnaire is submitted, a prescriber goes through your answers. If anything is unclear or missing, we'll get in touch before any decision is reached. How long this takes depends on your individual circumstances.

Every fee is shown to you upfront, before you decide whether to go ahead. Where a prescription is issued, you'll see the full treatment cost laid out clearly. Nothing is charged until you confirm that you want to continue.

No — we can't promise that, and you should be wary of anyone who does. Results differ from one person to the next. Prescription medication is one part of a wider plan that also relies on a healthy diet, staying active, and ongoing support.

Every medicine carries the possibility of side effects. With weight-management medicines, the ones reported most often affect the digestive system — nausea, vomiting or diarrhoea, for example. Before you begin, we provide full safety information along with the official patient information leaflet for your treatment.

Yes, if you're happy for us to. With your consent we'll pass relevant prescribing and monitoring details on to your GP, so your ongoing care stays joined up and safe.

Prices are per month and depend on the dose you're prescribed. Treatment requires an online consultation, and a prescriber will decide whether it's appropriate for you.

*SURMOUNT-1 clinical trial (Jastreboff et al., New England Journal of Medicine, 2022) in adults with obesity, or with overweight and at least one weight-related condition. Participants who stayed on tirzepatide 15 mg once weekly for 72 weeks, alongside a reduced-calorie diet and increased physical activity, lost an average of 22.5% of their body weight. Individual results vary. The graph shows the overall shape of the trend, not individual data points.

Mounjaro is a registered trademark of Eli Lilly and Company. Slimn is not affiliated with or endorsed by Eli Lilly and Company.