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) pricing in the UK varies significantly depending on whether you access it through the NHS or private prescription routes. Private online prescription costs typically range from £129 to £320+ per month depending on your dose, while NHS access is free but requires specialist referral and faces long waiting lists in many regions. Understanding both routes helps you make an informed decision about weight loss treatment options available to you.
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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 Pricing & What Affects Cost
Private prescription costs in the UK vary by dose and provider. Starting doses (2.5 mg) typically cost around £129–£150 per month, while maintenance doses (10–15 mg) range from £250–£320+ monthly. Each KwikPen contains four weeks of doses, so costs scale with your treatment phase. Several factors affect pricing: your current dose (higher doses cost more), your provider's pricing model, and whether you're on a dose escalation schedule or maintenance. Costs may also include the online consultation fee (typically £30–£50), though some providers bundle this. It's worth noting that weight loss injection uk providers often offer package pricing if you commit to longer treatment periods, which can reduce per-injection costs. Using our free GLP-1 weight loss calculator can help you estimate potential costs at different doses before committing to treatment.
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 vs Private Access Routes for Mounjaro
NHS access to Mounjaro is free but limited. NICE approved tirzepatide for use within NHS specialist tier 3 and tier 4 weight management services, but access is highly restricted by region and availability. You'll typically need a GP referral to a specialist weight management service, and waiting lists can stretch months or years depending on your local ICB (Integrated Care Board). Private prescription weight loss uk offers faster access through online consultations with licensed UK prescribers, without NHS referral needed. An online assessment takes 10–20 minutes, after which a prescriber decides if Mounjaro is suitable for you. If approved, your prescription is sent to a GPhC-registered pharmacy for delivery. Private route timelines are typically 5–7 days from consultation to first dose, making it significantly faster than NHS routes in most regions.
- 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 getting more expensive in the UK?
Mounjaro pricing in the UK has remained relatively stable on private prescription routes (£129–£320+ per month depending on dose), though manufacturers occasionally adjust prices. NHS pricing does not apply to patients as treatment is free when accessed through the NHS, though availability is limited. Monitor your provider's pricing if considering private treatment.
Can you get Mounjaro on the NHS for free?
Yes, Mounjaro is available on the NHS through specialist weight management services, and you pay nothing for the medication itself. However, access requires GP referral to a tier 3 or 4 service and eligibility assessment. Waiting lists are very long in many UK regions, sometimes 12–24 months. Private routes offer faster access but require payment.
How do online Mounjaro prescriptions work in the UK?
You complete an online health assessment with a UK-licensed prescriber (takes 10–20 minutes). The prescriber reviews your BMI, health conditions, and medications. If approved, they issue a prescription to a GPhC-registered pharmacy, which delivers your Mounjaro KwikPen to your home within 5–7 days. You self-inject weekly at home.
What's the difference between tirzepatide and Mounjaro?
Tirzepatide is the active ingredient; Mounjaro is the brand name. Tirzepatide is a dual GIP and GLP-1 receptor agonist that helps regulate appetite and blood sugar. Both private and NHS routes use the same tirzepatide medication — the difference is in access route, cost, and timeline rather than the drug itself.
How does Mounjaro compare to Wegovy in terms of cost?
Both Mounjaro and Wegovy (semaglutide) cost similarly on private UK prescription routes (£129–£320+ monthly depending on dose). The main cost difference is that Mounjaro typically involves fewer dose escalations to reach maximum dose, potentially saving money long-term. Use our GLP-1 weight loss calculator to compare projected costs and outcomes at different doses.
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.