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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Mounjaro Patient Information — How to Access in the UK
Mounjaro (tirzepatide) is a prescription-only weight management injection available in the UK through both NHS specialist services and private prescribing routes. This guide covers everything you need to know about accessing Mounjaro, including eligibility criteria, costs, and what to expect from an online clinical assessment. Whether you're considering the NHS pathway or private prescription, understanding your options helps you make an informed decision about weight management support.
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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 Much Does Mounjaro Cost in the UK?
Private prescription costs for Mounjaro in the UK typically range from £129 to £320 per month, depending on the dose and provider. The 2.5 mg starting dose is generally at the lower end of this range, while the maximum 15 mg dose costs more. Each KwikPen contains four weekly doses, so your monthly cost covers a full four-week supply. Unlike NHS prescriptions, private costs are not capped by prescription charges. Additional factors affecting cost include: whether you receive ongoing prescriber support between doses, whether delivery is included, and whether you need repeat consultations. Some providers offer bundle discounts for purchasing multiple months in advance. Always check what is included in the quoted price — some services include follow-up consultations, while others charge separately for dose escalation reviews.
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 Routes
NHS route: Access through specialist tier 3 weight management services requires a GP referral. NICE has approved tirzepatide for use in NHS specialist services, but availability varies significantly by region and waiting lists can be substantial. Private route: You can access a prescription through a GPhC-registered online pharmacy without NHS referral. An online consultation with a UK-licensed prescriber typically costs £20–£50 and takes 24–48 hours. If approved, your prescription is dispensed by the pharmacy. This route is faster but you pay for both the consultation and medication. Try our GLP-1 weight loss calculator to estimate potential outcomes at different doses, and use our BMI calculator to confirm your eligibility before pursuing either route.
- 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.
What is the minimum cost to start Mounjaro privately in the UK?
The minimum cost is typically the online consultation fee (£20–£50) plus the first KwikPen at the 2.5 mg starting dose (approximately £129–£160). This gives you a four-week supply. Total initial outlay is usually £150–£210. Subsequent months cost £129–£160 depending on your dose.
Do I need a GP referral to get Mounjaro privately?
No. Private online prescribing does not require a GP referral. You complete an online consultation directly with a UK-licensed prescriber, who assesses your eligibility independently. However, informing your GP is recommended for continuity of care and to avoid medication interactions.
How long does it take to get Mounjaro through the NHS?
Timescales vary significantly by region and ICB. Some specialist weight management services have waiting lists of 6–12 months or longer. Your GP must refer you first, which can add 2–4 weeks. Private prescription is typically faster — often within 48 hours of approval.
Can I switch between NHS and private Mounjaro?
Yes, you can switch routes. However, you should inform your healthcare provider. If you start privately and later access NHS specialist services, or vice versa, the transition should be managed by your prescriber to ensure continuity of care and avoid accidental overdosing.
Are there hidden costs with private Mounjaro prescriptions?
Always clarify upfront what is included: the prescription fee, delivery costs, and whether follow-up consultations for dose escalation are included or charged separately. Some providers offer all-inclusive monthly plans, while others charge separately for consultations and medication. Compare clearly before committing.
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.