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
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Where to Get Mounjaro in the UK — Cost & Availability
Mounjaro (tirzepatide) is available in the UK through two main routes: NHS specialist weight management services and private prescription through GPhC-registered online pharmacies. Costs vary significantly depending on which route you choose, your dose, and your region. This guide explains where to access Mounjaro, what it costs, and how eligibility works so you can understand your options clearly.
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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.
NHS Access vs Private Mounjaro in the UK
NHS Access: Mounjaro became available through NICE-approved NHS weight management services, typically at tier 3 (specialist) level. However, NHS availability depends heavily on your region and local integrated care board (ICB) funding decisions. Many areas have significant waiting lists — sometimes 6 to 18 months. You'll need a GP referral to a specialist weight management service, and the service will assess your eligibility based on BMI and weight-related health conditions.
Private Access: Private online prescribing makes Mounjaro available without NHS referral. You complete an online clinical assessment with a UK-licensed prescriber, and if approved, receive a prescription dispensed by a GPhC-registered pharmacy. Private costs typically range from £129 to £320 per month depending on your dose, with the Mounjaro KwikPen (4-week supply) being the standard format. Private access is faster — often within days — but costs significantly more than NHS access.
Use our free BMI calculator above to check your BMI and understand whether you might meet eligibility criteria for either route.
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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.
Mounjaro vs Wegovy — Which Is Cheaper and More Suitable?
Both Mounjaro and Wegovy are GLP-1 type weight loss injections available in the UK, but they work differently and cost differently. Mounjaro is a dual GIP and GLP-1 receptor agonist, while Wegovy is a GLP-1 agonist only. Clinical trial data shows Mounjaro users lost approximately 15–21% of body weight on average, compared to approximately 15% for Wegovy. However, individual results vary significantly.
Private costs are broadly similar — typically £129 to £320 monthly for either medication depending on dose. NHS access, when available, eliminates cost but requires meeting local eligibility criteria and enduring waiting lists. Your prescriber will assess which medication suits you based on your health profile, not cost alone. Try our GLP-1 weight loss calculator to understand potential outcomes at different doses with either medication.
- 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.
Is Mounjaro available on the NHS in my area?
Mounjaro is now approved by NICE for NHS use in specialist weight management services, but availability varies significantly by region. Some areas have well-established programmes; others have long waiting lists or limited availability. Contact your GP to ask about NHS referral to your local tier 3 weight management service — they can tell you current waiting times and eligibility criteria.
How much does Mounjaro cost privately in the UK?
Private Mounjaro typically costs between £129 and £320 per month depending on your dose, with the Mounjaro KwikPen (4-week supply) being standard. The starting dose is usually 2.5 mg, increasing gradually to a maintenance dose (typically 10–15 mg). Each dose level has a different cost. Prices vary between providers, so it's worth comparing after you receive your prescription.
What's the difference between Mounjaro and Wegovy cost-wise?
Private costs for both Mounjaro and Wegovy are broadly similar — typically £129 to £320 monthly depending on dose. On the NHS, both are available through specialist services where cost is covered, though availability and waiting times vary. Neither is routinely available through standard GP prescription on the NHS.
Do I need a prescription for Mounjaro even if paying privately?
Yes. Mounjaro is prescription-only in the UK. Private online prescribers (UK-licensed doctors) conduct a clinical assessment and issue a prescription if appropriate. The prescription is then dispensed by a GPhC-registered pharmacy. You cannot buy Mounjaro without a valid prescription from a UK-licensed prescriber.
What makes me eligible for Mounjaro on the NHS?
NHS eligibility typically requires a BMI of 30 kg/m² or above, or 27–29.9 with weight-related health conditions (type 2 diabetes, hypertension, sleep apnoea, cardiovascular disease, or dyslipidaemia). South Asian, Chinese, Black African, and Caribbean adults may qualify at lower BMI thresholds. Your GP or specialist will assess your individual suitability during referral. ```
Ready to take control of your weight loss journey?
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