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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Where To Get Mounjaro From in the UK
Mounjaro (tirzepatide) is available in the UK through both NHS specialist services and private online prescribing routes. Where you access it depends on your eligibility, local availability, and preference. The NHS route involves referral to tier 3 weight management services, whilst private access is available through registered online clinics following a clinical assessment. This guide explains both pathways, associated costs, and what to expect from each route.
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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.
Private Mounjaro Access & Typical UK Costs
Private access to Mounjaro is available through GPhC-registered online pharmacies in the UK, following an assessment by a UK-licensed prescriber. Cost ranges typically £129–£320 per month depending on the Mounjaro dose you're prescribed and the provider you use. The Mounjaro KwikPen (which contains 4 weeks of doses) is the standard format available. Initial costs may be higher if your first prescription requires a higher starting dose or faster titration. Once on a stable maintenance dose—typically 10 mg or 15 mg for most people—monthly costs stabilise. Private prescribers assess your eligibility based on BMI, weight-related health conditions, and medical history, rather than through NHS gatekeeping. The entire process from online consultation to prescription and delivery usually takes 2–5 working days. Payment is required upfront, and most providers accept debit/credit card or bank transfer. Unlike NHS provision, private prescriptions are not free and costs are entirely your responsibility. Some people choose private access if NHS waiting lists in their region are extremely long, or if they prefer not to be referred to specialist NHS 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 Routes & What To Expect
NHS access to Mounjaro is through tier 3 specialist weight management services. You'll need a referral from your GP, followed by assessment and prescription through the specialist clinic—this is free at the point of care. However, NHS availability varies significantly by region (ICB), and waiting lists can extend many months or even years in some areas. Private access is faster: you complete an online assessment, pay the prescription cost, and receive medication within days. The online consultation process involves answering health questions, blood pressure measurement (sometimes home-based), and review by a prescriber who decides if Mounjaro is appropriate for you. Both routes require clinical assessment—private consultations are thorough and GPhC-regulated, not quick rubber stamps. Costs, speed, and ongoing support differ, so weigh both options based on your circumstances, urgency, and local NHS waiting times. Use our GLP-1 weight loss calculator to estimate potential outcomes, then discuss which access route suits you best with a prescriber.
- 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 through NHS specialist weight management services at the point of care. However, you need a GP referral and assessment by a tier 3 clinic, which can involve long waiting lists depending on your region. Availability and access vary significantly across UK regions.
Can I get Mounjaro privately without NHS referral?
Yes. Private access is available through GPhC-registered online pharmacies following an assessment by a UK-licensed prescriber. No NHS referral is needed. You pay the prescription cost (typically £129–£320/month depending on dose), and the entire process usually takes 2–5 working days from consultation to delivery.
What does an online Mounjaro consultation involve?
Online assessments typically include health questionnaire, blood pressure check (often home-based), medical history review, and discussion of weight-related conditions. A prescriber then reviews your eligibility based on BMI, comorbidities, and medication interactions. If approved, a prescription is issued and dispensed by a registered pharmacy.
How long are NHS waiting lists for Mounjaro?
NHS waiting times vary widely by region and local ICB (integrated care board) capacity. Some areas have waiting lists of several months; others over a year. Contact your local tier 3 weight management service through your GP for current waiting times in your area.
Is the online consultation for private Mounjaro thorough?
Yes. Private prescribers must conduct proper clinical assessments—they're legally required to review your health comprehensively before prescribing. This includes checking for contraindications, medication interactions, and whether weight loss medication is medically appropriate for you. It's not a quick process, but faster than NHS pathways.
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.