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 Access Mounjaro in the UK and What It Costs
Mounjaro (tirzepatide) is a prescription-only weight loss injection available in the UK through both NHS specialist services and private online prescribing routes. Access pathways and costs differ significantly depending on which route you choose. The NHS offers Mounjaro through tier 3 specialist weight management services, though availability varies by region and waiting lists can be lengthy. Alternatively, private prescribing offers faster access following an online clinical assessment. Understanding your options helps you make an informed decision about which route suits your circumstances.
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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 you're prescribed. A Mounjaro KwikPen contains four weekly doses, so monthly costs equate to approximately £129–£80 per week for lower doses, rising to £80 per week at the maximum 15 mg dose. These prices are consistent across most GPhC-registered online pharmacies in the UK. Costs vary slightly between providers due to different pricing structures, but the difference is usually modest.
When budgeting for private Mounjaro, remember you'll also need a prescription, which typically costs £20–£50 depending on the online clinic. Some providers bundle the consultation fee with the first prescription. Always confirm the total cost—medication plus consultation—before proceeding. Use our free GLP-1 weight loss calculator to estimate potential results at different doses, helping you decide if private access is right for you.
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 Routes
The NHS route is free once prescribed, but requires referral to a tier 3 specialist weight management service and can involve waiting lists of several months or longer in many areas. NHS availability also depends on your local Integrated Care Board (ICB) budget and regional commissioning decisions. NICE has approved tirzepatide for NHS use within specialist weight management services, but access remains limited.
The private route offers faster access—typically within days of your online consultation—without NHS referral. You'll pay for the medication and consultation upfront but avoid waiting lists. Check your BMI using our free BMI calculator to confirm you meet eligibility criteria (BMI ≥30, or ≥27 with weight-related conditions) before pursuing either route. A licensed prescriber will assess whether Mounjaro is clinically appropriate for you.
- 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 a Mounjaro KwikPen cost privately in the UK?
A Mounjaro KwikPen (four weekly doses) costs approximately £129–£320 in private UK pharmacies, depending on your prescribed dose. Lower starter doses (2.5 mg, 5 mg) are cheaper than maximum doses (15 mg). Always ask about total costs including the prescription fee before ordering.
Is Mounjaro available on the NHS in the UK?
Yes, NICE has approved tirzepatide (Mounjaro) for NHS use within tier 3 specialist weight management services. However, NHS access is limited by regional availability and budgets. You'll need a GP referral to a specialist service. Waiting times vary significantly by area—some regions have waiting lists of months or years.
How quickly can I get Mounjaro privately in the UK?
Private online prescribing typically allows you to receive your first Mounjaro prescription within 2–5 days of your online consultation. Once prescribed, the medication is dispensed by a GPhC-registered pharmacy and usually arrives within 3–7 working days. This is much faster than most NHS routes.
What dose should I start on and how does cost change?
Most people start on 2.5 mg (the lowest dose) for four weeks, then increase gradually every 4 weeks. Your prescriber will determine your dose based on your health and response. Costs rise with higher doses, but your starting cost is lower. Our GLP-1 calculator can help you understand typical dose progression.
Are there any hidden costs when getting Mounjaro privately?
The main costs are the prescription fee (£20–£50) and the medication itself. Some online clinics charge follow-up consultation fees if you need dose adjustments. Always confirm all costs upfront. Prescription weight loss injections are not covered by standard health insurance in the UK, so costs are out-of-pocket.
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.