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
Mounjaro Weight Loss Medication — UK Cost and Access
Mounjaro (tirzepatide) is a prescription-only weekly weight loss injection available in the UK through both NHS specialist services and private online prescribing. Access routes, eligibility criteria, and costs vary significantly depending on whether you pursue NHS or private treatment. Understanding your options helps you make an informed decision about this dual GIP and GLP-1 receptor agonist medication. This guide covers UK pricing, NHS NICE approval status, and how the consultation process works.
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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.
Private Prescription Costs and Access in the UK
In the UK, Mounjaro is available privately through GPhC-registered online pharmacies following an online clinical assessment. Private costs typically range from £130 to £320 per month depending on your dose and the provider. A standard 4-week supply at maintenance dose (usually 10mg or 15mg) costs approximately £230–£280 on average. Starter packs covering the full dose titration from 2.5mg to 10mg cost around £400–£500 total. Prices vary between providers, so comparing options is worthwhile. No NHS referral is needed for private access — you simply complete an online consultation with a UK-licensed prescriber, who will assess your eligibility. If approved, your prescription is dispensed by the pharmacy within 1–2 working days. Many private providers offer repeat prescriptions, meaning you don't need a new consultation each month once established on treatment.
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 Access, NICE Approval, and What to Expect
NHS access to Mounjaro is through specialist tier 3 and tier 4 weight management services — not standard GP prescription. NICE approved tirzepatide (Mounjaro) for NHS use, but availability varies significantly by region and ICB (Integrated Care Board). You'll need a GP referral to your local specialist weight management service, where you'll be assessed for eligibility. NHS waiting lists can be months to years in many areas. Once approved through the NHS, Mounjaro is free at the point of prescription. Use our free GLP-1 weight loss calculator to estimate potential outcomes at different doses, and our BMI calculator to check your starting point before any consultation.
- 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 per month on private prescription in the UK?
Private Mounjaro costs typically range from £130–£320 per month depending on dose and provider. A standard 4-week maintenance dose (10mg or 15mg) usually costs £230–£280. Starter packs covering full titration cost around £400–£500 total. Always compare providers as costs vary.
Can I get Mounjaro free on the NHS in the UK?
Yes, Mounjaro is available free through NHS specialist weight management services following NICE approval. However, access requires a GP referral to tier 3/4 services, and waiting lists vary greatly by region. You may wait several months or longer depending on your area.
What happens during an online consultation for Mounjaro?
You'll complete a health questionnaire covering your medical history, weight, height, and current medications. A UK-licensed prescriber reviews this and may ask follow-up questions via video or message. If eligible, they issue a prescription to a GPhC-registered pharmacy, which dispenses within 1–2 working days.
Do I need a GP referral for private Mounjaro prescription in the UK?
No, private Mounjaro prescription does not require NHS referral. You can access it independently through online prescribing services. A GP referral is only needed if you want to pursue the NHS route through specialist weight management services.
What's the difference between NHS and private Mounjaro access timelines?
Private: online consultation to delivery within 3–5 days. NHS: GP referral, then wait for specialist appointment (weeks to months), then assessment, then wait for prescription (more months). Private is faster; NHS is free but slower, with significant regional variation.
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.