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 Results: UK Access & Cost
Mounjaro (tirzepatide) is a weekly weight loss injection licensed in the UK that has shown promising results in clinical trials. Understanding how to access this prescription medication and what it costs is essential for making an informed decision. Whether through NHS specialist services or private prescription, access routes vary significantly by region and individual eligibility. This guide explains your options, typical costs, and what the evidence shows about real-world outcomes.
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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 Costs and Access in the UK
Private prescription costs for Mounjaro in the UK typically range from £129 to £320 per month, depending on your dose and the provider. Starting doses (2.5mg) are usually at the lower end of this range, whilst maintenance doses of 10mg or 15mg cost significantly more. Each KwikPen contains four weekly injections, so monthly costs reflect a four-week supply.
To access Mounjaro privately, you arrange an online consultation with a UK-licensed prescriber through a GPhC-registered pharmacy. The consultation typically costs £15–£30 and assesses your medical history, current medications, and weight loss goals. If approved, a prescription is issued and dispensed by the pharmacy. This route bypasses NHS waiting lists and is available without GP referral, making it faster than NHS specialist services for many people.
- Starting dose (2.5mg): approximately £129–£160/month
- Maintenance dose (5–10mg): approximately £160–£240/month
- Maximum dose (15mg): approximately £240–£320/month
Results in clinical trials showed average weight loss of 15–21% body weight over 72 weeks alongside diet and exercise, though individual outcomes vary significantly.
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 vs Private: How to Access Mounjaro
NHS access is available through specialist tier 3 or tier 4 weight management services, typically following GP referral. However, NHS availability is extremely limited—waiting lists in many regions stretch months or even years. NICE has approved tirzepatide (Mounjaro) for use within NHS weight management services, but prescribing is not routine in primary care.
The private online route is significantly faster. You complete an online health questionnaire, have a brief video or telephone consultation with a licensed prescriber, and receive your prescription within 24–48 hours if approved. This weekly weight loss injection can be started immediately without NHS specialist assessment. Use our free BMI calculator to check your eligibility criteria first, and our GLP-1 weight loss calculator to see projected results at different doses.
- 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 privately in the UK?
Private Mounjaro costs typically range from £129–£320 per month depending on your dose. Starting doses (2.5mg) cost around £129–£160/month, whilst maintenance doses (10–15mg) cost £240–£320/month. Costs may vary between providers. Always compare options and confirm pricing before starting treatment.
Can I get Mounjaro on the NHS in the UK?
Yes, Mounjaro is NICE-approved for NHS specialist weight management services, but availability is extremely limited and varies by region. You'd need GP referral to a tier 3 or tier 4 service. Waiting lists can be very long. Private prescription is often faster if you meet eligibility criteria and can afford the cost.
How do I get a private Mounjaro prescription online?
Complete an online health assessment through a GPhC-registered pharmacy, have a consultation with a UK-licensed prescriber (video or telephone), and if approved, receive your prescription within 24–48 hours. The pharmacy then dispatches your KwikPens. Consultation fees are typically £15–£30 and are separate from medication costs.
What weight loss results can I expect from Mounjaro?
Clinical trials showed average weight loss of 15–21% body weight over 72 weeks when combined with a reduced-calorie diet and increased physical activity. However, individual results vary significantly. Some people lose more, others less. Results depend on dose, adherence, lifestyle changes, and individual metabolism.
Is Mounjaro the same as Wegovy?
No. Both are GLP-1-based weight loss injections licensed in the UK, but Mounjaro (tirzepatide) is a dual GIP+GLP-1 agonist, whilst Wegovy (semaglutide) is a GLP-1 agonist only. Mounjaro showed slightly higher average weight loss in trials (15–21% vs ~15%), but both are prescription-only and require clinical 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.