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 Can I Order Mounjaro in the UK?
If you're searching for where to order Mounjaro in the UK, you have two main routes: NHS specialist services or private prescription through a GPhC-registered online pharmacy. Mounjaro (tirzepatide) is a prescription-only weight management injection that requires a clinical assessment before dispensing. Unlike over-the-counter products, you cannot simply buy Mounjaro online without a prescription from a UK-licensed prescriber. This guide explains both access routes, how Mounjaro compares to alternatives like Wegovy, and what the eligibility criteria are.
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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 vs Private Access to Mounjaro in the UK
NHS access: Mounjaro is available through NHS specialist tier 3 and tier 4 weight management services following referral from your GP. NICE (National Institute for Health and Care Excellence) has approved tirzepatide for use within NHS specialist weight management services. However, availability varies significantly by region and ICB (Integrated Care Board). Many areas have substantial waiting lists — sometimes many months or even years — and not all regions currently offer the medication. Your GP can assess whether you meet local criteria and refer you if appropriate.
Private access: You can obtain a prescription through a private online consultation with a UK-licensed prescriber. If approved, the prescription is dispensed by a GPhC-registered pharmacy. Private access does not require an NHS referral and is typically faster than NHS routes. Costs vary by dose and provider, ranging from approximately £129 to £320 per month depending on the strength of Mounjaro KwikPen you are prescribed.
- NHS: free if available in your region; referral required; longer waiting times typical
- Private: faster access; costs apply; no NHS referral needed; assessment via online consultation
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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 — Key Differences When Ordering
Both Mounjaro and Wegovy are prescription-only weight management injections available in the UK, but they work differently. Mounjaro (tirzepatide) is a dual GIP and GLP-1 receptor agonist, activating two natural hormone pathways. In the SURMOUNT clinical trials, participants on the maximum 15 mg dose lost an average of approximately 20.9% of their body weight over 72 weeks. Wegovy (semaglutide) is a GLP-1 receptor agonist only, activating a single pathway. In the STEP trials, average weight loss at the maximum 2.4 mg dose was approximately 14.9% over 68 weeks.
The choice between them depends on individual suitability, which a prescriber will assess during your clinical evaluation. Neither medication is "superior" — results vary significantly between individuals, and what works best for one person may differ for another. Both require a reduced-calorie diet and increased physical activity alongside medication use.
- 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.
Can I buy Mounjaro without a prescription in the UK?
No. Mounjaro is prescription-only and cannot be purchased without a valid prescription from a UK-licensed prescriber. Any online source claiming to sell Mounjaro without a prescription is operating illegally. Always use GPhC-registered pharmacies or NHS services.
How much does Mounjaro cost privately in the UK?
Private Mounjaro costs typically range from £129 to £320 per month depending on the dose you are prescribed. Prices vary between providers. Starting doses (2.5 mg) are generally cheaper than maintenance or maximum doses (15 mg). Always confirm pricing before ordering.
What is the difference between Mounjaro and Wegovy?
Mounjaro (tirzepatide) is a dual GIP+GLP-1 agonist; Wegovy (semaglutide) is a GLP-1-only agonist. Clinical trials showed different average weight loss amounts, though individual results vary. Both are prescription-only and require clinical assessment. A prescriber will determine which is more suitable for you.
How long does it take to receive Mounjaro on the NHS?
NHS timelines vary widely by region. Initial GP referral to specialist services can take weeks. Once referred, waiting lists for tier 3 services range from several months to over a year in many areas. Private options typically dispense faster (days to weeks after assessment).
Do I need to see my GP before ordering Mounjaro privately?
No — private online prescribing does not require a GP referral. However, you will need to complete an online clinical assessment with a UK-licensed prescriber who will evaluate your eligibility based on BMI, health conditions, and medication history. Always be honest in your assessment.
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.