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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Getting a Private Mounjaro Prescription in the UK
A private Mounjaro prescription in the UK is available through licensed online prescribers without needing an NHS referral. Unlike NHS access through specialist weight management services, private prescribing allows eligible adults to start treatment more quickly. Mounjaro is a once-weekly injectable medication containing tirzepatide that may support weight loss alongside diet and exercise. This guide explains how to obtain a private prescription, what to expect, and how it compares to NHS access.
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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 to Get a Private Mounjaro Prescription
Private Mounjaro prescriptions in the UK are issued by GPhC-registered online prescribers following a clinical assessment. The process typically involves completing an online health questionnaire, having your information reviewed by a UK-licensed doctor or nurse prescriber, and receiving a prescription if deemed clinically appropriate. Your eligibility will be assessed based on your BMI, medical history, current medications, and weight-related health conditions. Once approved, your prescription is sent to a registered pharmacy which dispatches your Mounjaro KwikPen directly to you. Many people find private prescribing faster than NHS routes, which can involve months of waiting for specialist tier 3 services. Private prescribing does not require a GP referral, though informing your GP is often recommended.
- Eligibility typically requires BMI of 30+ or BMI 27+ with weight-related health conditions
- Online consultation takes 10–20 minutes
- Prescribing decision usually within 24 hours
- First delivery typically within 3–5 working days
- Ongoing prescriptions renewable at similar timescales
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.
Cost and What to Expect
Private Mounjaro typically costs £129–£320 per month depending on the dose you're prescribed and your chosen provider. Costs vary because different providers use different sourcing and pricing models. Starting doses (2.5 mg) are usually at the lower end of this range, while maintenance doses (10–15 mg) cost more. Unlike NHS prescriptions, private Mounjaro is not covered by prescription charges — you pay the full cost. Many people budgeting for long-term treatment find it helpful to use our free GLP-1 weight loss calculator to estimate potential outcomes at different doses, which can inform whether the investment aligns with your goals. Always check the exact price quoted by your chosen provider before proceeding, as costs and availability vary.
- 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 private Mounjaro prescription the same as NHS Mounjaro?
Both contain the same medication (tirzepatide), but they differ in access. Private prescriptions are issued by online prescribers without NHS involvement and have no waiting list. NHS Mounjaro comes through specialist tier 3 weight management services and may have significant waiting times. The medication, doses, and monitoring principles are identical — the difference is the pathway and cost.
Do I need my GP's permission for a private Mounjaro prescription?
No, you do not need GP permission for a private prescription. However, it is good practice to inform your GP that you are starting Mounjaro, especially if you take other medications or have existing health conditions. Your GP may want to monitor your progress or adjust other medications. Some prescribers will contact your GP directly with your consent.
Can I switch from private to NHS Mounjaro?
Potentially, but you would need to be referred to an NHS tier 3 specialist weight management service and meet their eligibility criteria. If you are already on a private prescription and wish to continue on the NHS, discuss this with your GP. Conversely, you cannot usually switch directly from NHS to private — you would stop NHS treatment and start a private prescription separately.
How long does it take to get a private Mounjaro prescription?
The entire process typically takes 24–48 hours from submitting your online health questionnaire to receiving your prescription and dispatch confirmation. Your first Mounjaro KwikPen usually arrives within 3–5 working days. This is significantly faster than NHS access, where specialist referrals and assessments can take several months depending on your region and waiting list length.
What happens if a private prescriber says I'm not eligible for Mounjaro?
If deemed ineligible, the prescriber will explain the clinical reason — for example, if you have a contraindication or medical condition that makes the medication unsafe for you. You can seek a second opinion from another licensed prescriber, ask your GP for advice, or explore other weight management options. Eligibility assessment is based on clinical safety, not cost.
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.