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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Private Prescription for Mounjaro in the UK
If you're considering Mounjaro for weight management in the UK, you have two main routes: NHS specialist services or private prescription through an online clinical assessment. This guide explains how private prescriptions work, what to expect, typical costs, and how the process compares to accessing Mounjaro through the NHS. Understanding both options will help you choose the right path for your situation.
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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.
How Private Mounjaro Prescriptions Work in the UK
A private prescription for Mounjaro is issued by a UK-licensed prescriber following an online clinical assessment. You do not need an NHS referral to a specialist weight management service — instead, you complete a consultation with an independent prescriber, who evaluates your health, medical history, BMI, and suitability for the medication. If approved, you receive a prescription that can be dispensed by a GPhC-registered pharmacy. The entire process typically takes 24–48 hours from initial consultation to prescription issuance. Each Mounjaro KwikPen contains four weekly doses, and prescriptions usually cover one month supply at a time. Costs vary depending on which dose you're prescribed — starting doses (2.5 mg) are typically less expensive than maintenance doses (10–15 mg). Many private providers offer flexible payment options, including monthly recurring subscriptions. It's important to note that private prescriptions are prescription-only medicines and require a genuine clinical assessment, not just payment — reputable UK providers will not issue prescriptions without a thorough health review.
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: How to Access Mounjaro in the UK
NHS access to Mounjaro is through NICE-approved specialist tier 3 weight management services. You'll need a GP referral, and availability varies significantly by region — some areas have waiting lists of 6–12 months or longer. Once accepted, the NHS covers the cost entirely, but access is strictly rationed based on commissioning criteria. Private access bypasses NHS waiting lists entirely. You consult with a private prescriber online, pay out-of-pocket (typically £129–£320 monthly depending on dose), and receive your prescription quickly. Private providers do not have regional restrictions. Neither route is inherently "better" — the NHS route is cost-free but requires patience; the private route is faster but requires self-funding. Our free GLP-1 weight loss calculator can help you estimate potential outcomes at different doses to support your decision.
- 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 a private prescription for Mounjaro cost in the UK?
Private Mounjaro costs typically range from £129–£320 per month depending on your dose. A 2.5 mg starter dose is usually at the lower end; maximum doses (15 mg) are at the higher end. Each prescription usually covers one month (four weekly injections in one KwikPen). Many providers offer subscription discounts or payment plans. Always confirm the exact price with your chosen provider before starting.
Can I get Mounjaro on the NHS instead of paying privately?
Yes. NICE has approved Mounjaro for use in NHS specialist weight management services for eligible adults. Access is through tier 3 services following a GP referral. However, NHS availability is limited and varies by region — waiting times can be several months. Private prescription bypasses waiting lists but requires out-of-pocket payment. Your GP can advise whether you'd meet NHS eligibility criteria in your area.
What happens during an online consultation for a private Mounjaro prescription?
You'll complete a health questionnaire covering your medical history, current medications, weight, height, and lifestyle. A UK-licensed prescriber then reviews your information and may ask follow-up questions via phone or secure messaging. They assess your BMI, weight-related health conditions, and suitability for Mounjaro. If approved, a prescription is issued; if not approved, you'll receive an explanation. The entire process typically takes 24–48 hours.
Is Mounjaro the same as a Mounjaro KwikPen, and how long does one pen last?
Yes — Mounjaro is supplied as a pre-filled KwikPen injection device. Each pen contains four weekly doses, so one KwikPen lasts four weeks (one month). You inject once weekly, rotating your injection site. Your prescription will typically be for one KwikPen per month, though this may change if your dose is adjusted during dose titration.
How does private Mounjaro compare to private Wegovy prescriptions?
Both are available privately in the UK, but they differ in mechanism and dosing. Mounjaro (tirzepatide) is a dual GIP/GLP-1 agonist with doses from 2.5–15 mg weekly; Wegovy (semaglutide) is a GLP-1 agonist with doses from 0.25–2.4 mg weekly. Clinical trials show Mounjaro may produce slightly higher average weight loss, but individual results vary significantly. Both are prescription-only and require clinical assessment. Your prescriber can advise which is more suitable for you based on your health profile.
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.