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
How Much Does Mounjaro Cost in the UK?
Mounjaro (tirzepatide) is available in the UK through NHS specialist weight management services or private online prescription routes, with costs varying significantly between them. If you're considering this prescription weight loss injection, understanding the different pricing models — including bundle packages and dose options — will help you make an informed decision about accessibility and affordability.
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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 Bundle Options
Mounjaro is available privately through UK-registered online pharmacies following a clinical assessment with a licensed prescriber. Private costs typically range from £130 to £320 per month, depending on the dose and provider. A KwikPen contains four weekly injections, so pricing usually reflects one month's supply.
- 2.5 mg (starter dose): Approximately £130–£160
- 5–7.5 mg (mid-range): Approximately £160–£220
- 10–15 mg (higher doses): Approximately £220–£320
Bundle discounts are sometimes available — purchasing multiple pens (e.g., three or four months' supply upfront) may reduce the per-dose cost by 10–15%. Some providers offer subscription models with slight savings compared to single-purchase pricing. Always check whether your chosen provider offers bundle packages or subscription discounts before ordering.
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 Prescription Route
NHS route: Mounjaro is approved by NICE for use within specialist tier 3 and 4 weight management services. If eligible through NHS pathways, there is no cost at point of dispensing (as with all NHS medications). However, NHS access requires referral from your GP to a specialist weight management service, and availability varies significantly by region. Waiting lists can extend from several months to over a year in many areas due to high demand.
Private route: Faster access without NHS referral. Online consultations with a UK-licensed prescriber typically cost £15–£50 and take 24–48 hours. If approved, your prescription is dispensed by a GPhC-registered pharmacy. No waiting list, but you pay the full cost. Use our free GLP-1 weight loss calculator to estimate potential results at different doses before committing.
When comparing costs, remember that private prescriptions require ongoing payments for each KwikPen, whereas NHS treatment (once accessed) is free. However, if your GP has told you NHS specialist services have a very long waiting list in your area, private prescription may offer faster access to treatment. Your GP can also advise whether you meet NHS eligibility criteria (BMI 30+ or 27–29.9 with weight-related health conditions). Individual circumstances, regional NHS capacity, and personal preference for speed of access all influence the best route 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.
What is included in a Mounjaro bundle package?
A Mounjaro bundle typically includes multiple KwikPens (usually 3–4 pens, representing 12–16 weeks of treatment). Each pen contains four pre-filled weekly doses. Bundle pricing aims to reduce the overall cost per dose compared to purchasing single pens. Some providers include a sharps disposal bin or injection guidance with bundles.
Can I get cheaper Mounjaro on the NHS?
Yes — Mounjaro is free on the NHS once prescribed through a specialist weight management service. However, you must be referred by your GP and meet eligibility criteria. NHS waiting lists are long in many regions, so access can take months to over a year. Private prescription provides faster access but requires payment.
Does Mounjaro cost less at different doses?
Yes — lower starter doses (2.5–5 mg) are cheaper than higher maintenance doses (10–15 mg). Your prescriber will start you on 2.5 mg and increase gradually every 4 weeks, so costs will increase over your first 4–5 months of treatment. Our GLP-1 weight loss calculator can help you compare projected costs at different dose levels.
What is the difference between Mounjaro and Wegovy pricing?
Both are GLP-1-related injections available privately at similar cost ranges (£130–£320/month depending on dose). Mounjaro is a dual GIP+GLP-1 agonist with higher doses available; Wegovy is GLP-1 only with a maximum dose of 2.4 mg. Clinical trial data showed slightly higher average weight loss with Mounjaro, but individual results vary. Pricing and availability differ by provider.
Are there ways to reduce the cost of private Mounjaro?
Yes — look for bundle discounts (purchasing multiple pens upfront), subscription models (slightly cheaper than per-dose), or providers offering loyalty discounts. Some online clinics match competitor prices. Always verify the provider is GPhC-registered and the prescriber is UK-licensed. Speak to your GP about NHS eligibility first, as free NHS access is preferable if waiting times are acceptable in your area.
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.