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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Mounjaro Injection in the UK: Cost and Access
Mounjaro (tirzepatide) is a prescription-only weekly weight loss injection now available in the UK through both NHS specialist services and private online prescribing. Access and cost vary significantly depending on your route. This guide explains how to get Mounjaro in the UK, what you'll pay, NHS eligibility criteria, and the differences between specialist weight management services and private prescription options. Use our free GLP-1 weight loss calculator above to estimate potential outcomes at different doses.
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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 Mounjaro Cost in the UK
Private Mounjaro costs in the UK typically range from £129 to £320 per month, depending on the dose and provider. A single KwikPen contains four weeks' worth of weekly injections (one dose per week), so monthly cost reflects a four-week supply at your current dose.
- Lower doses (2.5–5 mg): Usually £129–£180 per month
- Mid-range doses (7.5–10 mg): Typically £200–£250 per month
- Higher doses (12.5–15 mg): Generally £280–£320 per month
These costs are for the medication only. Private prescriptions also require an online clinical consultation, usually £20–£50 as a one-time assessment fee. No pharmacy names are referenced here—you'll need to compare licensed GPhC-registered pharmacies directly to find current pricing for your dose. Remember that costs may vary and prices should always be confirmed with the provider before ordering.
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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.
NHS vs Private Access: Which Route Is Right for You?
NHS route: Free prescriptions if eligible, but requires referral to a tier 3 specialist weight management service from your GP. Availability varies significantly by region, and waiting lists can be lengthy—sometimes months to over a year in many areas. You'll need a BMI of 30 or above, or 27–29 with a weight-related health condition.
Private route: No GP referral needed. Quick access via online consultation with a UK-licensed prescriber. Available within days. Ideal if you can't access NHS services locally or prefer faster initiation. You'll need to pay for both the consultation and medication. Try our BMI calculator above to check your current BMI against NHS eligibility thresholds.
- 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 quickly can I access Mounjaro privately in the UK?
Private access is typically much faster than NHS. After completing an online consultation (usually 15–30 minutes), a UK-licensed prescriber assesses your eligibility. If approved, your prescription is sent to a GPhC-registered pharmacy and dispatched within 1–3 working days. Total time from consultation to receiving your first KwikPen is often 3–5 days.
Is Mounjaro available on the NHS in the UK?
Yes, Mounjaro (tirzepatide) is now approved by NICE for use within NHS tier 3 specialist weight management services. However, NHS availability varies by region and depends on your local Integrated Care Board (ICB). Ask your GP about referral to specialist services in your area. NHS prescriptions are free, but access can take weeks or months.
What's the difference between a weekly weight loss injection and daily injections like Saxenda?
Mounjaro and Wegovy are both once-weekly injections, whereas Saxenda (liraglutide) requires a daily injection. Weekly injections are simpler to manage and more convenient. Mounjaro is a dual GIP and GLP-1 agonist, while Wegovy is a GLP-1 agonist only—this may affect efficacy and side effects differently between individuals.
Do I need to pay for private Mounjaro consultations every month?
No. The initial online consultation fee (usually £20–£50) is a one-time cost to obtain your prescription. Repeat prescriptions for subsequent months are typically reissued without an additional consultation fee, though some providers may charge a small repeat prescription fee (usually £5–10).
What should I expect during the online consultation for Mounjaro?
Your UK-licensed prescriber will review your medical history, current medications, BMI, and weight-related health conditions. They'll assess suitability for Mounjaro and discuss dose titration schedules, side effects, and lifestyle changes. The consultation takes 15–30 minutes. If approved, a prescription is issued that day or within 24 hours.
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.