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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Will Mounjaro Prices Fall in the UK?
Mounjaro (tirzepatide) pricing in the UK is influenced by NHS funding decisions, private market competition, and generic availability timelines. Currently, Mounjaro remains an expensive prescription weight loss injection, costing between £150–£300 per month privately depending on your dose. Whether prices will drop depends on several factors including NICE guidance updates, increased market competition, and potential future generic alternatives. Understanding the current UK pricing landscape and your access options through NHS or private routes can help you make informed decisions about tirzepatide treatment.
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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 and Pricing in the UK
NHS Route: Mounjaro is available through NHS specialist tier 3 weight management services, though availability and waiting times vary significantly by region. When prescribed on the NHS, you pay only the standard prescription charge (currently £9.90 per prescription in England), regardless of the actual cost to the NHS. This makes NHS access significantly cheaper, but eligibility requires referral from your GP and meeting specific BMI and health criteria.
- BMI 30 or above, or BMI 27–29.9 with weight-related health conditions
- Assessment by specialist weight management services
- Regional variation in availability and waiting times
- Prescription charge applies (£9.90 in England)
Private Route: Private prescriptions cost considerably more, typically £150–£320 per month depending on your dose and provider. Your dose affects cost: lower starting doses like 2.5 mg cost less than maintenance doses of 10 mg or 15 mg. Private access is faster than NHS routes but requires payment in full.
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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.
Future Mounjaro Pricing Trends and What Could Bring Costs Down
Several factors could influence whether Mounjaro prices drop in the UK. Generic competition is a major consideration — tirzepatide's patent protection will eventually expire, potentially allowing cheaper generic versions, though this remains years away. Increased market competition from other weight loss medications like Wegovy may apply downward pressure on pricing. NICE's ongoing assessment of weight loss medicines and potential updates to NHS weight management pathways could also influence availability and pricing over time.
For now, the most reliable way to access Mounjaro affordably is through NHS specialist services if you're eligible. Using our free GLP-1 weight loss calculator can help you understand potential outcomes and whether treatment might be worth pursuing. Your GP can advise on NHS eligibility and referral to local weight management services, which remain the most cost-effective route for most UK adults.
- 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 available on the NHS in the UK?
Yes, Mounjaro (tirzepatide) is available through NHS specialist tier 3 weight management services for adults meeting eligibility criteria (BMI 30+, or 27+ with weight-related health conditions). However, NHS availability varies by region and waiting lists can be significant. When prescribed on the NHS, you pay only the standard prescription charge (£9.90 in England), not the full cost.
How much does Mounjaro cost privately in the UK?
Private Mounjaro prescriptions cost approximately £150–£320 per month depending on your dose and provider. Starting doses (2.5 mg) cost less than maintenance doses (10–15 mg). Prices vary between private prescribing services, so it's worth comparing options. This is significantly higher than NHS costs.
Will Mounjaro become cheaper in the future?
Mounjaro could become cheaper in the future through several mechanisms: generic tirzepatide alternatives once patents expire (likely several years away), increased competition from other weight loss medications, and potential NHS pathway changes. However, specific timelines are uncertain. Current NHS access remains the most affordable option.
What's the difference between NHS and private Mounjaro prescribing?
NHS prescriptions cost only £9.90 (England) but require eligibility, GP referral, and specialist assessment with potential waiting lists. Private prescriptions cost £150–£320 monthly but are faster and don't require NHS referral. Your choice depends on eligibility, budget, and how urgently you need treatment.
Can I reduce Mounjaro costs by using a lower dose?
Lower doses do cost less privately — starting doses (2.5 mg) cost less than higher maintenance doses (15 mg). However, your prescriber will recommend a dose based on your health needs and weight loss goals, not just cost. NHS prescriptions have a flat charge regardless of dose, so cost isn't a deciding factor for NHS patients.
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.