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 to Access Mounjaro Privately in the UK
If you're interested in Mounjaro (tirzepatide) for weight management but don't want to wait for NHS specialist services, private access is available in the UK through online prescribing. This route allows you to obtain a prescription from a UK-licensed prescriber following an online clinical assessment, without needing an NHS referral. We'll explain how private Mounjaro access works, what to expect, and how it compares to NHS routes.
10,000+ calculations today ยท NHS-aligned thresholds ยท 100% free
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/mยฒ).
While BMI isn't a perfect measure โ it doesn't account for muscle mass, bone density, or fat distribution โ 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 โ 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 Private Mounjaro Access Works in the UK
Private Mounjaro is dispensed by GPhC-registered online pharmacies following a clinical assessment by a UK-licensed prescriber. The process typically involves: completing an online health questionnaire, having your information reviewed by a prescriber, receiving a prescription if clinically appropriate, and having your Mounjaro KwikPen delivered to your home. You do not need to be referred to NHS specialist services or wait on tier 3 waiting lists. Private prescribers assess your BMI, medical history, and any weight-related health conditions to determine eligibility. Most private providers require a BMI of 30 or above, or 27โ29.9 with qualifying health conditions such as type 2 diabetes, hypertension, or sleep apnoea. The assessment is similar to what NHS specialist services conduct, but the private route bypasses NHS waiting times entirely.
- Assessment completed online via secure questionnaire
- Prescription issued within 24โ48 hours if approved
- Mounjaro KwikPen delivered by post to your address
- Ongoing support and dose monitoring available from your private provider
- You can use your own GP for blood tests if needed
Clinically BackedWeight Loss
No appointments. No waiting rooms. Just care โ 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 โ 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 โ completely free.
Private Mounjaro Costs and Eligibility in the UK
Private Mounjaro costs vary depending on the dose you're prescribed and your provider. Typically, monthly costs range from approximately ยฃ130โยฃ300 per month, with starting doses (2.5 mg) at the lower end and maximum doses (15 mg) at the higher end. Unlike the NHS, which is free at point of use for eligible patients, private prescribing involves paying upfront for your prescription and medication. Some private providers offer subscription packages or discounts for longer-term commitment. Before starting private Mounjaro, check whether your provider offers ongoing clinical support, dose titration guidance, and what happens if you experience side effects. Consider also consulting your GP about your decision to take prescription weight loss medication privately โ your GP can provide additional support and monitor your health alongside private care.
- 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 โ 5mg โ 7.5mg โ 10mg โ 12.5mg โ 15mg
- GLP-1 receptor agonist
- Up to 15โ17% body weight loss (STEP trials)
- Weekly injection, 5-step dose escalation
- NHS & private prescription available
- Doses: 0.25mg โ 0.5mg โ 1mg โ 1.7mg โ 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 | 15โ22.5% | 12โ17% |
| Key trial | SURMOUNT-1 (2022) | STEP 1 (2021) |
| Max dose | 15 mg weekly | 2.4 mg weekly |
| Escalation period | 20โ32 weeks | 16โ20 weeks |
| Administration | Weekly injection (pen) | Weekly injection (pen) |
| NHS availability | Private prescription only | NHS & private |
| Approx. private cost | ยฃ150โยฃ250/month | ยฃ150โยฃ300/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 โ 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 difference between private Mounjaro and NHS Mounjaro?
NHS Mounjaro is prescribed through specialist tier 3 weight management services, is free at point of use, but involves waiting lists that vary by region. Private Mounjaro bypasses NHS services, is prescribed online after a clinical assessment, but costs ยฃ130โยฃ300/month. Both require a prescription from a qualified UK prescriber and both assess your eligibility similarly.
How long does it take to get a private Mounjaro prescription?
Most private providers assess your online questionnaire and issue a prescription within 24โ48 hours if you're approved. Delivery typically takes 2โ5 working days. Private access is significantly faster than NHS routes, which can involve months of waiting for specialist appointments.
Can I start Mounjaro privately and then switch to NHS?
Switching between private and NHS prescribing can be complex and depends on your regional NHS services. Some NHS specialist services may continue a prescription started privately, but this is not assured. Contact your local NHS tier 3 service to ask about their policy on accepting patients already taking private Mounjaro.
Is private Mounjaro the same medication as NHS Mounjaro?
Yes โ both are the same tirzepatide medication in the same KwikPen devices. The difference is only in how you access it (private online prescriber vs NHS specialist service) and cost. The medication, doses, and mechanism are identical.
What happens if I have side effects with private Mounjaro?
Your private provider should offer clinical support for managing side effects. You can also contact your GP for additional help. Mounjaro's most common side effects are nausea, diarrhoea, and constipation, which usually improve as your body adjusts. Seek urgent care if you experience severe stomach pain, as this could indicate pancreatitis.
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.