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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How to Access Mounjaro Online in the UK
Mounjaro (tirzepatide) is a prescription-only weight loss injection available online in the UK through private prescribing services. Access depends on whether you go through the NHS or choose private routes. NHS access is limited and typically requires referral to specialist weight management services with significant waiting times. Private online access is faster but involves upfront costs. This guide explains both routes, typical costs, and what the online consultation process involves so you can understand your options.
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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 Online Mounjaro Cost and Access in the UK
Private online prescribing for Mounjaro is available through GPhC-registered online pharmacies without requiring an NHS referral. The cost varies depending on the dose and the provider you choose. Typical pricing ranges from approximately £129 to £320 per month, with higher doses (particularly the 15 mg maintenance dose) costing more than starter doses.
To access Mounjaro online privately, you'll complete an online clinical assessment with a UK-licensed prescriber. This assessment evaluates your medical history, current medications, BMI, weight-related health conditions, and suitability for this GLP-1 receptor agonist treatment. If approved, a prescription is issued and dispensed by the pharmacy. Private access typically takes 7–14 days from initial consultation to receiving your first pen, compared to NHS waiting times that can span several months to over a year in many regions.
- Typical cost per dose: £15–£25 depending on strength and provider
- Four pens supplied per KwikPen box (four weeks)
- Monthly costs increase as you progress to higher maintenance doses
- Some providers offer subscription discounts or package pricing
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 to Mounjaro
NHS access to tirzepatide requires referral to a tier 3 or tier 4 specialist weight management service through your GP. NICE has approved tirzepatide for NHS use, but availability varies significantly by region and ICB (Integrated Care Board). Many areas have long waiting lists or limited capacity. Once accepted into an NHS specialist service, the medication is provided free. However, the entire pathway—from GP referral to first prescription—can take 6–18 months depending on your area.
Private online access is faster and doesn't require NHS referral, but you pay the full cost upfront. This route suits people who want quicker access or live in areas with limited NHS provision. Use our free GLP-1 weight loss calculator above to estimate potential outcomes at different doses, and discuss costs with your chosen private provider to understand total treatment expense.
- 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.
How much does Mounjaro cost on the NHS?
Mounjaro is free on the NHS when prescribed through specialist weight management services. However, access requires GP referral and can involve waiting lists of several months to over a year depending on your region. Availability also varies by ICB, and some areas have limited capacity or eligibility criteria.
Can I get Mounjaro online without seeing my GP?
Yes, through private online prescribing. You complete a clinical assessment with a UK-licensed prescriber via an online consultation. If approved, a prescription is issued and dispensed by a GPhC-registered pharmacy without needing an NHS referral. This process typically takes 7–14 days.
What happens in an online Mounjaro consultation?
The prescriber reviews your medical history, current medications, BMI, weight-related health conditions, and lifestyle. They assess whether tirzepatide (a GIP receptor agonist) is suitable for you. You'll be asked about previous weight loss attempts, diet, exercise, and any contraindications. The full consultation usually takes 15–30 minutes.
Is Mounjaro available on prescription from regular GP practices?
Not routinely. Most GPs cannot prescribe Mounjaro for weight management under current NHS guidelines. You typically need referral to a specialist tier 3 weight management service. However, some private GPs may offer prescriptions if they have appropriate governance and experience with weight loss medications.
What's the total cost of Mounjaro treatment for a year?
Private treatment costs approximately £1,550–£3,840 annually depending on your starting dose and progression to maintenance (15 mg typically costs more). This doesn't include any clinic consultation fees, which vary by provider. NHS treatment is free but involves significant waiting times. Budget planning is important before starting private treatment.
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.