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
Where Is The Cheapest Mounjaro In The UK?
Mounjaro (tirzepatide) is available in the UK through two main routes: NHS specialist services and private online prescribing. The cost varies significantly depending on which route you choose and your eligibility. This guide explains where you can access Mounjaro, what you'll pay, and how to find the most affordable option for your situation. Remember that price should never be the only factor — ensure any prescriber has assessed your individual health needs properly.
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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 — Cost and Access
NHS Route (Free but with waiting): Mounjaro is available through NHS specialist tier 3 weight management services, meaning there is no direct cost to you. However, access requires a GP referral and availability varies significantly by region (Integrated Care Board). Many areas have waiting lists of several months to over a year. You must also meet specific eligibility criteria: BMI of 30 or above, or BMI 27–29.9 with weight-related health conditions such as type 2 diabetes, hypertension, or cardiovascular disease. For South Asian, Chinese, Black African, or Black Caribbean adults, lower thresholds may apply.
Private Route (Immediate access with cost): Private prescribing through UK-licensed online prescribers is faster but involves fees. Costs typically range from £130–£320 per month depending on your dose. This includes both the consultation fee and medication cost. Private prescribers assess your eligibility through an online questionnaire and may request blood tests or GP records. You receive a prescription which is dispensed by a GPhC-registered pharmacy. This route requires no NHS referral and no waiting list, but costs accumulate month-on-month.
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.
How To Find The Most Affordable Option
To find the cheapest Mounjaro option for your situation: First, contact your GP about NHS referral if you think you're eligible — this is free but requires waiting time and may not be available in all areas. Second, if you want faster access or your area has limited availability, compare private prescribers. Prices vary between providers and different doses cost different amounts — lower starting doses (2.5 mg) are cheaper than higher maintenance doses (15 mg). Always check that any prescriber is UK-licensed and registered with the General Pharmaceutical Council (GPhC). Never prioritise price over safety: a legitimate prescriber will ask about your medical history, current medications, and any contraindications before issuing a prescription. Remember that Mounjaro should be combined with lifestyle changes — diet and exercise — for best results.
- 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 Mounjaro cheaper on the NHS than privately?
Yes, Mounjaro is free on the NHS but access requires GP referral to a specialist service and may involve waiting lists of many months. Private prescribing is faster but costs £130–£320/month depending on dose. Choose based on whether you can wait for NHS access or need faster treatment.
What's the typical cost of Mounjaro per month privately in the UK?
Private Mounjaro typically costs £130–£320 per month depending on your dose. Starting doses (2.5 mg) are cheaper than higher doses (15 mg). Always confirm the full cost with your prescriber before proceeding, as prices vary between providers.
Can I get Mounjaro cheaper by switching doses?
Mounjaro doses must be escalated gradually over weeks under clinical supervision — you cannot simply choose the lowest dose long-term. Starting doses are cheaper but your prescriber will increase the dose as tolerated. You must stay at each dose for at least 4 weeks.
Is there a difference in price between Mounjaro and Wegovy?
Both are prescription-only weight loss injections with different costs. Mounjaro (tirzepatide) and Wegovy (semaglutide) are separate medications with separate pricing. Compare costs between providers and choose based on what your prescriber recommends for your individual health needs.
What should I check before buying Mounjaro online?
Always verify the prescriber is UK-licensed and registered with the General Pharmaceutical Council (GPhC). Check that the pharmacy dispensing your prescription is also GPhC-registered. Be cautious of unusually cheap options or sellers who don't ask medical questions — legitimate prescribers always assess your suitability first.
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.