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
What Does Mounjaro Cost in the UK?
Mounjaro (tirzepatide) is a prescription-only weight management injection available in the UK through two main routes: NHS specialist services and private online prescribing. Costs vary significantly between these pathways, ranging from no charge through the NHS to approximately £129–£320 per month privately, depending on your dose and provider. Understanding your options helps you make an informed decision about accessing this treatment. Our GLP-1 weight loss calculator can help you explore potential outcomes at different doses, while your GP can discuss NHS eligibility with 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.
How Much Does Mounjaro Cost Privately in the UK?
Private Mounjaro costs in the UK typically range from £129 to £320 per month, depending on your starting dose and the provider you choose. A standard Mounjaro KwikPen contains four doses (a four-week supply), so monthly costs reflect a full month of treatment. The dose you're prescribed determines the price: lower starting doses like 2.5 mg cost less than higher maintenance doses like 15 mg. Most private prescribers follow a structured dose escalation protocol—you'll start on 2.5 mg for four weeks, then increase every four weeks until you reach your effective dose, which may be 5 mg, 10 mg, or higher. This means your first month may cost less than subsequent months. Private access also includes the cost of an online clinical assessment (typically £40–£150), which is a one-time fee. When comparing providers, check whether your quoted price includes ongoing prescriber support, as this varies between services.
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 to Mounjaro in the UK
NHS access: Free through the NHS, but available only through specialist tier 3 or tier 4 weight management services. You'll need a GP referral, and waiting times can range from several months to over a year depending on your region and service capacity. Not all NHS ICBs (Integrated Care Boards) currently offer Mounjaro—availability varies by postcode.
Private access: Available immediately following an online consultation with a UK-licensed prescriber. No GP referral needed. You pay upfront for each prescription. Private providers are GPhC-registered pharmacies operating within UK law. The online consultation typically takes 15–30 minutes and assesses your medical history, BMI, weight-related health conditions, and current medications to ensure Mounjaro is suitable for you. If approved, your prescription is issued and dispensed within 1–3 working days.
- 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 free on the NHS in the UK?
Yes, Mounjaro is available free through NHS specialist weight management services for eligible adults. However, access is limited to tier 3/4 services and availability varies significantly by region. Waiting times can be very long—many areas have backlogs of 6–12 months. If you need treatment urgently, private prescribing is an alternative.
What is included in the monthly Mounjaro cost?
The quoted private cost typically covers the four-week supply of Mounjaro (one KwikPen with four pre-filled doses). This does not include the initial online consultation fee (usually £40–£150, paid once). Some providers include ongoing prescriber support; others charge separately. Always clarify what's included before committing.
Can I switch between NHS and private Mounjaro?
Switching between NHS and private provision is possible but requires discussion with both your NHS specialist (if applicable) and your private prescriber. There's no official protocol, so coordination between services is essential. Continuity of your dose schedule is important to maintain treatment effectiveness.
How long does it take to get Mounjaro through private prescription in the UK?
The entire process typically takes 1–3 weeks. Online consultation can be completed within days, prescriber assessment takes 24–48 hours, and the pharmacy dispenses within 1–3 working days. Some providers offer expedited services. Compare timelines with different providers if speed is important to you.
What if I can't afford private Mounjaro long-term?
If private costs become unsustainable, discuss NHS options with your GP. You can ask for a referral to your local weight management service—these services are free but may have waiting lists. Some regions have changed their eligibility criteria recently, so your GP can advise on current NHS availability in your area.
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.