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 a prescription-only weight management injection available in the UK through both NHS specialist services and private prescribing. Costs vary significantly depending on your dose, where you access it, and whether you use NHS or private routes. Understanding the pricing structure and access pathways can help you make an informed decision about whether this medication is right for you. Use our GLP-1 weight loss calculator to estimate potential weight loss outcomes at different doses before considering cost.
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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 in the UK
Private prescription costs for Mounjaro in the UK typically range from £129 to £320 per month, depending on your starting dose and how quickly your prescriber increases it. The 2.5 mg starter dose (used for weeks 1–4) is usually the least expensive, while the 15 mg maximum maintenance dose costs more. Each KwikPen contains four weeks of injections, so you'll need approximately one pen per month. Private costs also include the online consultation fee (typically £30–£50) and may vary between different GPhC-registered online pharmacy providers. Some providers offer package pricing if you commit to multiple months upfront. It's worth comparing providers, though all must follow the same clinical assessment process. The medication itself is the same regardless of provider — pricing differences reflect operational costs and business models rather than product quality.
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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.
NHS vs Private Access Routes
NHS access to Mounjaro is through specialist tier 3/4 weight management services following GP referral, but availability is limited and varies significantly by region. Waiting lists can be several months to over a year in many areas. Private access involves an online consultation with a UK-licensed prescriber (usually completed within 24–48 hours), after which a prescription is sent to a GPhC-registered pharmacy for dispensing. Private doesn't require NHS referral and offers faster access, but you pay the full cost. Neither route assures prescription — your individual health, BMI, and eligibility will be assessed. Use our BMI calculator to check where you stand on the BMI scale before pursuing either route, as eligibility thresholds are BMI 30+ or BMI 27+ with weight-related health conditions.
- 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's included in the Mounjaro price?
The price typically covers the pre-filled KwikPen device itself. You'll also pay for the online consultation (if private) and may incur delivery charges. The medication, injection training, and ongoing prescriber support are usually included. NHS costs are covered by the NHS if prescribed through specialist services — no direct cost to the patient.
Can I get Mounjaro on the NHS for free?
Yes, if you're referred to a specialist NHS tier 3 weight management service and deemed eligible, Mounjaro is available free through the NHS. However, access is limited and varies by region. Your GP must refer you, and waiting lists can be lengthy. Private access offers faster availability but requires payment.
Do private Mounjaro prices include the KwikPen device?
Yes, the quoted price includes the pre-filled KwikPen pen device. Each pen contains four weeks of injections. You'll typically pay monthly (one pen per month once you reach maintenance dose) unless you purchase a package covering multiple months upfront at a discounted rate.
Is Mounjaro cheaper than Wegovy in the UK?
Pricing is generally comparable — both cost roughly £129–£320 per month privately depending on dose and provider. Wegovy's maximum dose (2.4 mg) may cost slightly differently than Mounjaro's maximum (15 mg) due to different titration schedules. Compare providers directly for the most accurate pricing for your specific dose plan.
What happens after I receive a Mounjaro prescription?
Your pharmacy will dispense the KwikPen device with instructions. You'll inject once weekly (typically on the same day each week). Your prescriber will usually follow up after 4 weeks to assess tolerance and side effects before increasing your dose. Most private providers offer ongoing support and can adjust your treatment plan as needed.
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.