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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Cheapest Mounjaro in the UK — Cost Comparison Guide
Mounjaro (tirzepatide) pricing varies significantly across UK private providers, from around £129 to £320+ per month depending on dose. NHS access through specialist weight management services is free but involves long waiting lists in most regions. This guide compares costs between private online prescribing and NHS routes, explains what affects pricing, and helps you understand where to find affordable Mounjaro lawfully. Prices change regularly, so always confirm current costs before prescribing.
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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.
NHS vs Private Mounjaro Access in the UK
NHS Route: Mounjaro is available free through NICE-approved tier 3 and tier 4 specialist weight management services once prescribed. However, NHS access requires referral from your GP and typically involves waiting lists ranging from 3 months to over 2 years depending on your region. Not all integrated care boards (ICBs) offer equal access — some regions have significantly longer delays or limited availability. You'll need a BMI of 30 or above (or 27+ with weight-related health conditions) to qualify.
Private Route: GPhC-registered online pharmacies offer Mounjaro following an online clinical assessment with a UK-licensed prescriber. Private costs typically range from £129 per month for lower doses (2.5–5 mg) to £280–£320 for higher maintenance doses (10–15 mg). No referral needed, and availability is usually immediate once prescription is issued. Prices vary by provider and dose, so shopping around can help you find the most affordable option.
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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.
What Affects Mounjaro Cost in Private UK Prescribing
The primary cost driver is dose strength — starting doses (2.5 mg) are cheapest, while maximum doses (15 mg) cost the most. Monthly subscription models are common with private providers, meaning you pay per prescription issued. Some services charge consultation fees (typically £20–£50) on top of medication costs. KwikPen supply logistics, pharmacy dispensing fees, and prescriber assessment costs all factor into final pricing. Using our free GLP-1 weight loss calculator can help you estimate projected dose escalation timelines, which informs total treatment costs. Always ask providers upfront whether costs include all consultations and whether they offer dose-based pricing tiers.
- 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.
Is there a legally cheap way to get Mounjaro in the UK?
Yes. NHS prescription is free but involves waiting lists. Private online prescribing ranges £129–£320/month depending on dose. Both routes are legal — NHS requires GP referral to specialist services; private requires clinical assessment with a UK-licensed prescriber through a GPhC-registered pharmacy. Always verify the prescriber is UK-licensed and the pharmacy is GPhC-registered.
Why does Mounjaro cost more than Wegovy in some places?
Mounjaro uses a dual GIP/GLP-1 mechanism versus Wegovy's single GLP-1 mechanism. Manufacturing, supply chain, and prescriber assessment costs differ between providers. Dose also affects price — Mounjaro's maximum 15 mg dose costs more than Wegovy's maximum 2.4 mg. Compare providers directly as pricing varies significantly.
Can I get cheaper Mounjaro by switching doses or providers?
Yes. Starting doses (2.5 mg) are cheaper than maintenance doses (15 mg). Different private providers charge different rates for the same dose — shopping around can save £30–£100+ per month. However, dose should be titrated based on clinical response, not cost. Your prescriber will advise the appropriate dose for you.
Does NHS Mounjaro ever become available quickly?
Waiting times vary by region and ICB. Some areas have 3–6 month waits; others exceed 2 years. Contact your local tier 3 weight management service for current timelines. If waiting, private prescribing offers immediate access but at personal cost. Many patients combine NHS waiting with private treatment initially.
Are there hidden costs when buying Mounjaro privately?
Confirm costs upfront: medication price, consultation/assessment fee, pharmacy dispensing fee, and any repeat consultation charges. Some providers offer bundle pricing; others charge per element. Always ask whether the quoted price includes future dose increases or if those incur additional assessment fees. Read terms carefully before committing.
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.