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 Strengths: UK Cost & Access Guide
Mounjaro (tirzepatide) is available in the UK through both NHS specialist services and private online prescription routes. Understanding the strengths of this medication includes knowing how to access it, what it costs, and which route suits your situation. This guide covers NHS eligibility, private prescription costs, and the online assessment process so you can make an informed decision about whether Mounjaro is right for you.
10,000+ calculations today · NHS-aligned thresholds · 100% free
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
Mounjaro is available privately through GPhC-registered online pharmacies following a clinical assessment with a UK-licensed prescriber. Private costs typically range from £129 to £320 per month depending on your dose, with variation between providers. The lowest doses (2.5 mg and 5 mg) tend to be more affordable, while higher doses (10 mg, 15 mg) cost more. Each KwikPen contains four weekly doses, so you'll need to budget for ongoing monthly prescriptions. Private access doesn't require an NHS referral—you can begin the process immediately by completing an online consultation. The prescriber will assess your BMI, medical history, and suitability before issuing a prescription, which is then dispensed by the pharmacy. Many people choose the private route because waiting times for NHS specialist services can extend many months or even years depending on your region.
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 vs Private Route: Which Is Right for You?
The NHS route requires referral to a tier 3 specialist weight management service through your GP, typically with significant waiting lists. Once accepted, Mounjaro is dispensed free on prescription if approved by the specialist team. However, NHS availability varies dramatically by region and ICB (Integrated Care Board), and some areas have very limited capacity. The private route offers immediate access without NHS waiting but requires you to pay the full cost. Use our free BMI calculator to check your personal eligibility—adults with a BMI of 30 or above, or 27 with weight-related health conditions, may qualify. Your decision may depend on urgency, cost, and regional NHS availability.
- 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 costs typically range from £129 to £320 per month depending on your dose. Lower doses (2.5 mg, 5 mg) are usually cheaper, while higher doses cost more. Each KwikPen pen contains four weekly doses, so plan for ongoing monthly expenses. Costs vary slightly between online pharmacies.
What is the difference between NHS and private Mounjaro?
The medication itself is identical. The difference is access: NHS requires a GP referral to specialist services (free but with waiting lists), while private access is immediate through online prescription but you pay full cost. Both routes require clinical assessment to confirm suitability.
Can I get Mounjaro on the NHS in the UK?
Yes, if referred to a tier 3 specialist weight management service and approved. NICE has approved tirzepatide for NHS use, but availability varies by region and waiting lists can be lengthy. Ask your GP about referral options in your area.
What happens during a private online consultation for Mounjaro?
You complete a health questionnaire covering BMI, medical history, current medications, and weight-related conditions. A UK-licensed prescriber reviews this and assesses your eligibility. If suitable, they issue a prescription dispensed by a GPhC-registered pharmacy—typically within 24–48 hours.
Is Mounjaro the same as Wegovy or Ozempic?
No—Mounjaro (tirzepatide) uses a dual GIP and GLP-1 mechanism, while Wegovy (semaglutide) is GLP-1 only. Ozempic is also semaglutide but licensed for diabetes, not weight management. All require prescription, but Mounjaro and Wegovy have different strengths and trial data—your prescriber helps determine which suits you.
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.