The UK's most complete GLP-1 guide
Every Question Answered. Every Side Effect Explained.
- How GLP-1 medications work
- Mounjaro vs Wegovy compared
- Injection instructions
- Side effects & solutions
- What to eat on treatment
- FAQs answered
Free tracker included with every download this week
How to Get Mounjaro Prescribed in the UK
If you're wondering how to get Mounjaro prescribed in the UK, you have two main routes: NHS specialist services or private online prescription. Mounjaro (tirzepatide) is a prescription-only weight management injection available once weekly. Access varies depending on which route you choose, and costs differ significantly between NHS and private options. This guide explains your options, eligibility requirements, and what the prescription process involves.
10,000+ calculations today · NHS-aligned thresholds · 100% free
Calculate Your BMI Instantly
Enter your height and weight below. Supports both imperial (stone & lbs) and metric (kg). Results include NHS category, healthy weight range, and ethnicity adjustments.
What Is BMI and Why Does It Matter?
Body Mass Index (BMI) is the most widely used screening tool for assessing whether your weight falls within a healthy range. Used by the NHS, GPs, and weight management services across the UK, BMI provides a quick snapshot of your weight relative to your height. The formula is simple: your weight in kilograms divided by your height in metres squared (kg/m²).
While BMI isn't a perfect measure — it doesn't account for muscle mass, bone density, or fat distribution — it remains the standard first step in identifying potential weight-related health risks including type 2 diabetes, cardiovascular disease, high blood pressure, and certain cancers.
The NHS also recommends adjusted thresholds for people of South Asian, Chinese, or Black African heritage — a BMI of 23 or above is classified as overweight, and 27.5 as obese. Our calculator includes this adjustment as a one-click toggle.
Private Prescription Cost & Access in the UK
The private prescription route is often faster than waiting for NHS access. Private online prescribers in the UK can issue Mounjaro prescriptions following an online clinical assessment, typically without a GP referral needed.
Cost ranges: Private Mounjaro typically costs between £129 and £320 per month, depending on the dose you're prescribed. Starting doses (2.5 mg) are usually at the lower end; higher maintenance doses (10–15 mg) cost more. Each KwikPen contains 4 weeks of doses, so monthly costs represent a 4-week supply.
- Starting dose (2.5 mg): approximately £129–£150/month
- Maintenance doses (5–10 mg): approximately £180–£250/month
- Maximum dose (15 mg): approximately £280–£320/month
Prices vary between providers. The assessment fee (usually £25–£45) may be charged separately or included in your first prescription cost. Use our free GLP-1 weight loss calculator to explore different doses and potential outcomes.
Clinically BackedWeight Loss
No appointments. No waiting rooms. Just care — from a UK-regulated online pharmacy.
How It Works
Three simple steps to understand your weight and take action.
Enter your height and weight in our free calculator. Get your BMI, NHS category, healthy weight range, and ethnicity-adjusted thresholds instantly.
If your BMI suggests you're overweight or obese, explore our GLP-1 calculators to project potential weight loss on Mounjaro or Wegovy.
Use our progress tracker to log your weight weekly, visualise your journey with charts, and stay motivated — all stored privately in your browser.
Free Weight Loss Tools & Guides
Everything you need to understand your weight, explore medication options, and track your progress — completely free.
NHS vs Private Routes & What to Expect
NHS access: Mounjaro is available through NHS specialist tier 3 weight management services following NICE guidance, but access is limited and varies by region. Your GP can refer you, though waiting times can be months or years depending on your local Integrated Care Board (ICB). Once approved, NHS prescriptions are free at point of care.
Private online consultation process: Register with a private prescriber, complete a health questionnaire, and have a brief video or telephone consultation with a UK-licensed doctor. If approved, your prescription is sent to a GPhC-registered pharmacy, which dispenses and delivers your Mounjaro. The entire process typically takes 3–7 days.
Check your eligibility using our BMI calculator above—most adults with a BMI of 30+ or 27+ with weight-related health conditions qualify for either route.
- Dual GIP/GLP-1 receptor agonist
- Up to 22.5% body weight loss (SURMOUNT-1)
- Weekly injection, dose escalation over 20+ weeks
- Available via private prescription in the UK
- Doses: 2.5mg → 5mg → 7.5mg → 10mg → 12.5mg → 15mg
- GLP-1 receptor agonist
- Up to 15–17% body weight loss (STEP trials)
- Weekly injection, 5-step dose escalation
- NHS & private prescription available
- Doses: 0.25mg → 0.5mg → 1mg → 1.7mg → 2.4mg
Mounjaro vs Wegovy: Head-to-Head
A side-by-side comparison of the two most popular GLP-1 weight loss medications available in the UK.
| Feature | Mounjaro | Wegovy |
|---|---|---|
| Drug class | Dual GIP/GLP-1 agonist | GLP-1 agonist |
| Active ingredient | Tirzepatide | Semaglutide |
| Avg. weight loss | 15–22.5% | 12–17% |
| Key trial | SURMOUNT-1 (2022) | STEP 1 (2021) |
| Max dose | 15 mg weekly | 2.4 mg weekly |
| Escalation period | 20–32 weeks | 16–20 weeks |
| Administration | Weekly injection (pen) | Weekly injection (pen) |
| NHS availability | Private prescription only | NHS & private |
| Approx. private cost | £150–£250/month | £150–£300/month |
| Common side effects | Nausea, diarrhoea, constipation | Nausea, vomiting, diarrhoea |
Data sourced from SURMOUNT-1 and STEP 1 clinical trials. Costs are approximate and vary by provider. Always consult a prescriber.
Am I Eligible for Weight Loss Medication?
In the UK, eligibility for GLP-1 weight loss medications like Mounjaro and Wegovy is based on your BMI and overall health profile.
- BMI of 30 or above (obese)
- Age 18 or over
- No contraindicated conditions
- Committed to lifestyle changes
- BMI of 27 or above
- Plus type 2 diabetes
- Or high blood pressure
- Or obstructive sleep apnoea
Use our BMI calculator to check whether your BMI falls within the eligible range.
How We Built These Tools
Every calculator and guide on myweightcheck is built with accuracy and transparency in mind. Our BMI calculator uses the standard WHO formula with NHS-aligned category thresholds. Our GLP-1 projections are modelled on published clinical trial data from SURMOUNT and STEP studies.
All data stays on your device. We don't require sign-ups, and we don't store your health information on any server. Your progress tracker saves data locally in your browser using localStorage, so only you can see it.
We're based in the UK and our tools are designed specifically for UK users — supporting stone & lbs by default, referencing NHS guidelines, using NICE-approved medication data, and linking to GPhC-registered pharmacies.
Frequently Asked Questions
Common questions about BMI, weight loss medications, and our free UK tools.
How much does Mounjaro cost privately in the UK per month?
Private Mounjaro costs range from approximately £129–£320 per month depending on your dose. Starting doses (2.5 mg) are cheaper; maximum doses (15 mg) cost more. Each KwikPen supplies 4 weeks of weekly injections. Some providers charge a separate consultation fee (£25–£45). Always confirm the full cost with your chosen prescriber before starting.
Can I get Mounjaro on the NHS in the UK?
Yes, Mounjaro is available through NHS specialist weight management services (tier 3) following NICE guidance. However, access is limited and varies significantly by region. Your GP can refer you, but waiting times are often very long—sometimes several months or longer. Private prescription is faster but requires payment.
What is the online prescription process for Mounjaro in the UK?
You register with a private prescriber, complete a health questionnaire, and attend a brief consultation (video or phone) with a UK-licensed doctor. If approved, your prescription goes to a GPhC-registered pharmacy for dispensing and delivery. The whole process typically takes 3–7 days, much faster than NHS waiting lists.
Do I need a GP referral to get Mounjaro privately?
No. Private online prescribers can issue Mounjaro prescriptions directly following their own clinical assessment—you don't need a GP referral. However, it's always sensible to inform your GP that you're starting any medication, as they manage your complete health record.
Is Mounjaro the same as Wegovy? Which is cheaper?
Mounjaro (tirzepatide) and Wegovy (semaglutide) are different medications with different mechanisms. Mounjaro is a dual GIP and GLP-1 agonist; Wegovy is GLP-1 only. Both are prescription-only. Costs are similar (roughly £129–£320/month privately), though prices vary by provider and dose. Clinical trial data shows different average weight loss profiles—ask your prescriber which suits you better.
Ready to take control of your weight loss journey?
Start with a free BMI check, explore your GLP-1 options, or begin tracking your progress today. No sign-up. No cost. Just results.