To qualify for Mounjaro (tirzepatide) in the UK through a private online service, you generally need to be aged 18 or over with a BMI of 30 or more, or a BMI of 27 to 30 alongside a weight-related health condition such as type 2 diabetes, high blood pressure or sleep apnoea. Mounjaro is a prescription-only medicine, so a GPhC-registered prescriber must confirm it is clinically appropriate and safe for you after a consultation.
What are the exact eligibility criteria for Mounjaro in the UK?
Eligibility for Mounjaro in the UK rests on your age, your BMI and whether you have a weight-related condition. A prescriber checks these criteria against your full medical history before any treatment is issued.
- You are aged 18 or over.
- You have a BMI of 30 or more (the clinical definition of obesity); or
- You have a BMI of 27 to 30 and at least one weight-related condition, such as type 2 diabetes, high blood pressure, high cholesterol or obstructive sleep apnoea.
- A registered prescriber judges that Mounjaro is clinically appropriate and safe for you, with no reason you should not take it.
These criteria are consistent across the weight-loss injections and tablets we supply, including Wegovy injection, the Wegovy Tablet and Foundayo. You can see the full range on our treatments page.
How do you work out your BMI for Mounjaro?
Your BMI (body mass index) is your weight in kilograms divided by your height in metres squared. For Mounjaro, a BMI of 30 or more qualifies on its own, and a BMI of 27 to 30 qualifies if you also have a weight-related condition.
For example, someone 1.70m tall weighing 90kg has a BMI of about 31, which meets the 30-or-more threshold. The free online consultation calculates your BMI from the height and weight you enter, so you do not need to work it out yourself in advance.
Who is Mounjaro not suitable for?
Mounjaro is not suitable for everyone, even if your BMI meets the threshold. A prescriber will not issue it if any of the following apply, because the risks outweigh the benefit.
- You are pregnant, planning pregnancy or breastfeeding.
- You have type 1 diabetes.
- You have a personal or family history of medullary thyroid carcinoma or MEN2 (multiple endocrine neoplasia type 2).
- You have a history of pancreatitis.
- You have severe gastrointestinal disease or an active eating disorder.
- You have severe liver or kidney impairment.
- You have a known allergy to tirzepatide or any ingredient in the injection.
This is why an honest, complete medical history matters. Declaring a condition does not automatically rule you out of all treatment, but it allows the prescriber to choose the safest option for you.
What is Mounjaro and how does it work?
Mounjaro is the brand name for tirzepatide, a once-weekly self-injection licensed in the UK for weight management. It is distinctive because it activates two gut-hormone receptors at once — GLP-1 and GIP — which work together to reduce appetite and help you feel fuller for longer.
The dose is increased gradually to help your body adjust: it starts at 2.5mg, then steps up through 5mg, 7.5mg, 10mg and 12.5mg to a maximum licensed dose of 15mg. In the SURMOUNT-1 trial, participants on the 15mg dose lost on average 22.5% of body weight over 72 weeks, alongside lifestyle support. Individual results vary; not everyone reaches this. (Jastreboff AM, et al. N Engl J Med. 2022;387(3):205–216.)
What side effects should you know about before qualifying?
The most common Mounjaro side effects (affecting more than 1 in 10 people) are nausea, diarrhoea, constipation, vomiting, decreased appetite and fatigue. These often ease as your body adjusts to each dose, which is one reason the dose is increased slowly.
Rare but serious effects can include severe allergic reaction, acute pancreatitis, severe low blood sugar, severe gastrointestinal disease and worsening diabetic retinopathy. If you experience a side effect, you can report it through the MHRA Yellow Card scheme at https://yellowcard.mhra.gov.uk/.
How does qualifying actually work at The Weight Clinic?
Qualifying for Mounjaro is decided by a GPhC-registered prescriber after a free online consultation — it is never automatic or guaranteed. The process is designed so that treatment is only issued when it is clinically appropriate.
- You complete a free online consultation about your health, weight and medical history.
- A registered independent prescriber reviews your answers to check whether treatment is clinically appropriate and safe.
- A short video consultation takes place where clinically needed.
- If suitable, the medicine is dispensed by our own UK pharmacy and sent by tracked delivery, with ongoing prescriber support.
Medicines are dispensed by North Harrow Pharmacy, registered with the General Pharmaceutical Council (GPhC registration number 1034996), which anyone can verify on the GPhC register at pharmacyregulation.org. The Superintendent Pharmacist is Andrew Lane (GPhC 2027876). You can read more about The Weight Clinic or start the eligibility check via start consultation.
What does Mounjaro cost once you qualify?
The online consultation is free, and you only pay if a treatment is prescribed and you choose to proceed. The monthly price depends on your dose, which increases over time as you titrate up.
| Dose | Price per month |
|---|---|
| 2.5mg | £160 |
| 5mg | £185 |
| 7.5mg | £240 |
| 10mg | £260 |
| 12.5mg | £275 |
| 15mg | £295 |
You can compare options on the Mounjaro page and the combined weight-loss injections page. The right medicine and dose for you is a clinical decision made with your prescriber, not a choice based on price alone.
This article is for information only and is not a substitute for personalised medical advice. Weight-loss medicines are prescription-only, are not suitable for everyone, and are prescribed only after a clinical consultation with a GPhC-registered prescriber. Individual results vary. Always speak to a UK-registered pharmacist or doctor before starting or changing any prescription medication.
