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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Finding the Cheapest Mounjaro Provider in the UK
If you're looking for affordable Mounjaro in the UK, costs vary significantly depending on whether you access it through the NHS or private providers. NHS access is typically free but involves lengthy waiting lists through specialist weight management services. Private providers offer faster access, with prices ranging from approximately £129 to £320 per month depending on your dose. This guide compares Mounjaro pricing, explains cost factors, and looks at how Mounjaro costs compare to Wegovy so you can make an informed decision about which option suits your budget and needs.
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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.
Mounjaro Pricing and Cost Factors in the UK
Private Mounjaro costs depend primarily on the dose you're prescribed. Lower starting doses (2.5 mg and 5 mg) are typically cheaper—around £129–£180 per month—while higher maintenance doses (10 mg to 15 mg) can cost £250–£320 per month. Each KwikPen contains 4 weeks of doses, so monthly costs represent a single pen. Some private providers offer package discounts for purchasing multiple months upfront, which can reduce the per-month cost slightly.
- NHS access is free but requires referral to a tier 3 specialist weight management service through your GP—waiting times in many areas are 6–18 months or longer
- Prescription fees do not apply to weight management medications on NHS (unlike standard prescription charges)
- Private online prescribing requires an initial consultation (often £20–£50) plus the medication cost; some providers bundle this into your first month's fee
- Storage and delivery are usually included in quoted prices but confirm this when choosing a provider
When comparing "cheapest" providers, always verify they are GPhC-registered pharmacies dispensing genuine Mounjaro prescribed by UK-licensed prescribers. Unregistered or overseas suppliers carry serious legal and safety risks.
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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.
Mounjaro vs Wegovy—Cost and Suitability Comparison
Wegovy (semaglutide) typically costs £140–£300 per month privately in the UK, with similar dose-dependent pricing—lower starting doses are cheaper, higher doses more expensive. In clinical trials, Mounjaro (tirzepatide) showed slightly higher average weight loss (~15–21% of body weight) compared to Wegovy (~15%), though individual results vary considerably and prescriber assessment determines which is most suitable for you.
Both are prescription-only, require clinical assessment, and work best alongside a reduced-calorie diet and increased physical activity. Neither is "better"—suitability depends on your health profile, medical history, and how you respond to treatment. Use our free GLP-1 weight loss calculator to explore projected outcomes at different doses. Your prescriber will assess which medication aligns with your individual needs. Both require ongoing monitoring and may not be suitable if you have certain medical conditions or take specific medications.
- 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 the cheapest way to get Mounjaro in the UK?
The absolute cheapest option is NHS access (free at point of use), but waiting times are often 6–18+ months. Private providers typically cost £129–£320/month depending on dose. The lowest private cost is around £129–£150/month for starting doses (2.5–5 mg). Always use GPhC-registered pharmacies with UK-licensed prescribers.
Why does Mounjaro cost more at higher doses?
Higher doses contain more tirzepatide active ingredient. A 2.5 mg or 5 mg KwikPen costs less to manufacture than a 15 mg pen. Providers pass these differences to customers. You'll pay progressively more as you titrate up over 20+ weeks.
Is Mounjaro cheaper than Wegovy?
Prices are broadly similar (£129–£320/month). Both depend on dose. Mounjaro starting doses may be slightly cheaper initially, but final maintenance dose costs are comparable. The clinical outcomes also vary individually—neither is assured to be more "effective" at a given cost.
Can I get Mounjaro on the NHS?
Yes, if you're referred to a tier 3 specialist weight management service by your GP and meet eligibility criteria (BMI ≥30 or BMI ≥27 with weight-related health conditions). However, NHS waiting lists are very long in most areas—typically 6–18+ months depending on your region.
What should I check before buying Mounjaro from a UK provider?
Verify the provider is GPhC-registered, the prescriber is UK-licensed, and you receive a genuine prescription. Confirm storage and delivery are included in the quoted price. Check if initial consultations fees apply. Avoid unregistered suppliers—safety and legality depend on proper regulation.
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.