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 Peptides — How to Access and What It Costs in the UK
Mounjaro (tirzepatide) is a prescription-only GLP-1 and GIP receptor agonist injection that may help with weight management. Access in the UK is available through two main routes: NHS specialist weight management services and private online prescription services. Understanding the cost, eligibility, and access pathway will help you decide which option suits your circumstances. This guide explains both routes, what to expect during assessment, and realistic pricing information for UK adults.
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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 and Cost in the UK
Private access is available through registered online prescription services and GPhC-regulated pharmacies. You complete an online health assessment with a UK-licensed prescriber, and if clinically appropriate, a prescription is issued and dispensed by a registered pharmacy.
Cost context: Mounjaro pricing varies by dose and provider, typically ranging from approximately £150 to £320 per month depending on which dose you're prescribed. The KwikPen contains 4 weeks of injections at your current dose. Starting doses (2.5 mg) are usually at the lower end; higher maintenance doses (10–15 mg) cost more. Individual assessment and prescriber fees may apply in addition to medication cost. Payment is usually required upfront for each month's supply. Some providers offer subscription models or payment plans—check individual service terms.
- No NHS referral required
- Assessment typically completed within 24–48 hours
- Repeat prescriptions issued based on your progress and prescriber review
- Available without waiting lists
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 route: Mounjaro is approved by NICE for use through NHS tier 3 and tier 4 specialist weight management services. You need a GP referral, and availability varies significantly by region. Some ICBs (integrated care boards) have limited access; waiting lists can extend months or even years in many areas. When available, medication is funded by the NHS with no direct cost to you.
Private route advantages: Faster access without referral delays, flexible scheduling, and choice of prescriber. Online consultation is straightforward—you answer health questions, declare relevant medications and conditions, and the prescriber decides suitability based on your clinical profile. If approved, your prescription goes directly to a registered pharmacy for dispensing. Use our GLP-1 weight loss calculator to understand potential outcomes across different dose levels before starting.
Eligibility for both routes: UK adults with a BMI of 30 kg/m² or above, or 27–29.9 kg/m² with at least one weight-related health condition (type 2 diabetes, high blood pressure, sleep apnoea, cardiovascular disease history, or abnormal blood fats) may be assessed. South Asian, Chinese, Black African, and Black Caribbean adults may qualify at slightly lower BMI thresholds due to higher metabolic risk at lower weights. Pregnant women, those planning pregnancy, and those under 18 are not eligible. Your prescriber will assess medication interactions with any other medications you take. Track your progress with our free progress tracker once you start treatment to monitor outcomes across weeks and months.
- 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 privately in the UK?
Private Mounjaro typically costs £150–£320 per month depending on your dose. Starting doses (2.5 mg) are around £150–£180; higher maintenance doses (10–15 mg) cost £250–£320. Additional prescriber assessment fees may apply. Always confirm the exact cost with your chosen provider before committing, as prices vary between services.
Can I access Mounjaro through the NHS in the UK?
Yes. Mounjaro is NICE-approved for NHS tier 3 and tier 4 specialist weight management services. You need a GP referral to a local specialist centre. Availability and waiting times vary significantly by region. Some areas have limited access or long waiting lists, while others integrate it into established weight management programmes. Ask your GP about local provision.
What's the difference between NHS and private Mounjaro access?
NHS access requires a GP referral and is free but may involve waiting lists (weeks to years depending on region). Private access is faster (48 hours typical), doesn't require referral, but costs £150–£320 monthly. Both require clinical assessment. Choice depends on your timeline, region, and financial circumstances.
Do I need a prescription for Mounjaro in the UK?
Yes. Mounjaro is prescription-only in the UK. You cannot buy it without a valid prescription from a UK-licensed prescriber. Private online prescribers assess your health and issue a prescription if appropriate; you then collect from a GPhC-registered pharmacy. Never purchase without a prescription or from unregistered sources.
What happens after I'm prescribed Mounjaro—do I need ongoing monitoring?
Yes. Your prescriber will schedule follow-up reviews, typically every 4–12 weeks depending on how long you've been on the medication. These check your tolerance, progress, and whether your dose needs adjustment. Some private services offer text or email check-ins between appointments. Regular GP contact is also advisable to monitor any existing health conditions alongside treatment.
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.