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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How to Find the Best Mounjaro Provider in the UK
Finding a reliable Mounjaro provider in the UK depends on whether you access treatment through the NHS or privately. Mounjaro (tirzepatide) is a prescription-only weight loss injection licensed in the UK for adults with a BMI of 30 or above, or 27 or above with weight-related health conditions. Your GP can refer you to NHS specialist services, or you can access prescription weight loss through private online consultations with UK-licensed prescribers. This guide explains your options and what makes a trustworthy provider.
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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 vs Private Mounjaro Access in the UK
NHS access: Mounjaro is available through specialist tier 3 weight management services following a GP referral. NICE has approved tirzepatide for NHS use, but access varies significantly by region and availability. Waiting lists can be several months to over a year in many areas. Your GP will assess whether you meet criteria and make the referral.
Private access: GPhC-registered online pharmacies offer Mounjaro prescriptions following an online clinical assessment with a UK-licensed prescriber. Private providers typically respond faster and do not require NHS referral, though costs range from £129–£320+ per month depending on dose. Always verify the prescriber is registered with the General Medical Council (GMC) and the pharmacy with the GPhC.
Key safety checks: Whether NHS or private, ensure your provider conducts a proper clinical assessment, checks your medical history, and discusses side effects and contraindications. Legitimate providers will not rush the process or skip health screening.
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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.
What to Look for in a Mounjaro Provider
A trustworthy Mounjaro provider should ask detailed health questions before prescribing, including medication history, allergies, family health background, and any previous pancreatitis or thyroid conditions. They should explain the mounjaro dose titration schedule clearly — starting at 2.5 mg and increasing over weeks if tolerated. Providers should discuss realistic expectations, confirm that results vary individually, and provide clear guidance on injection technique, storage, and what side effects require urgent attention. Good providers also offer follow-up support and can adjust your prescription if needed.
Use our free GLP-1 weight loss calculator to estimate potential outcomes at different doses, and our BMI calculator to track your progress throughout treatment.
- 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 the UK?
Yes, Mounjaro (tirzepatide) is approved by NICE for NHS specialist weight management services. You'll need a GP referral to a tier 3 specialist service. Availability and waiting times vary significantly by region. Some areas have long waiting lists; others may have limited access. Contact your GP to ask about specialist services in your area.
Can I get Mounjaro privately without NHS referral?
Yes. Private GPhC-registered pharmacies offer Mounjaro following an online consultation with a UK-licensed prescriber. This route is faster than NHS referral but costs £129–£320+ per month depending on your dose. Always verify the prescriber is GMC-registered and the pharmacy is GPhC-registered before proceeding.
What should I check before choosing a Mounjaro provider?
Check that the prescriber is registered with the GMC and the pharmacy with the GPhC. Avoid providers who skip health screening, offer clinically studied weight loss, or pressure you into quick decisions. Good providers ask about your medical history, discuss mounjaro vs wegovy options if relevant, and explain the dose titration process clearly.
How much does private Mounjaro cost in the UK?
Private Mounjaro typically costs between £129–£320+ per month, depending on your dose (2.5 mg to 15 mg). Most private prescribers charge a consultation fee (£35–£75) for the initial assessment. Some services offer bundle discounts if you commit to multiple months. Prices vary between providers, so it's worth comparing.
How long does it take to get Mounjaro through a private provider?
Private providers are usually much faster than NHS. Once you complete an online consultation, most issue a prescription within 24–48 hours if appropriate. The pharmacy then dispatches your first KwikPen. NHS referral to specialist services, by contrast, can take weeks or months depending on your region and service capacity.
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.