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 Diary: Cost and Access in the UK
A Mounjaro diary is a way to track your weight loss journey while taking tirzepatide for weight management. If you're considering starting Mounjaro in the UK, understanding how to access it and what you'll pay is essential. This guide explains the difference between NHS and private access routes, typical costs for different doses, and what to expect during the online prescription process. Whether you're eligible through the NHS or considering private treatment, we'll help you understand your options.
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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 Costs in the UK
In the UK, Mounjaro is available through private online prescription services without requiring an NHS referral to specialist weight management services. Private access allows you to begin treatment more quickly, though it does involve upfront costs. Mounjaro costs typically range from £129 to £320 per month, depending on your dose and which prescribing service you use. Starting doses are lower (around £129–£150 for the initial 2.5 mg dose), while higher maintenance doses like 10 mg or 15 mg cost more. Prices vary between providers, so it's worth comparing. The Mounjaro KwikPen contains 4 weeks of injections, so monthly costs reflect a 4-week supply. Many people find private access valuable because it removes NHS waiting lists — specialist weight management services can have waiting times of several months to over a year in some regions. However, private treatment requires you to pay the full cost yourself; it won't be covered by the NHS unless you're referred through your GP to a tier 3 or tier 4 specialist service.
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 and Getting Started
The NHS route involves referral to a tier 3 weight management specialist service, which can take months depending on your region. Private access is faster: you complete an online consultation, answer health questions, and a UK-licensed prescriber assesses your eligibility. If approved, your prescription is sent to a GPhC-registered pharmacy and delivered to you. Both routes require a prescription — Mounjaro is prescription-only in the UK. The online consultation typically costs £20–£50 and takes 10–15 minutes. Your prescriber will check your BMI, review your medical history, and confirm you're not pregnant or breastfeeding. Use our free BMI calculator above to check your baseline, then discuss your results with the prescriber during your consultation. Many people keep a Mounjaro diary to track weight changes, side effects, and dose adjustments — our progress tracker can help you log this information weekly.
- 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 costs typically £129–£320 per month depending on your dose. Starting doses (2.5 mg) cost less, while higher maintenance doses (10–15 mg) cost more. Each KwikPen contains 4 weeks of injections. Prices vary between providers, so compare options before choosing.
Can I get Mounjaro on the NHS?
Yes, but through specialist tier 3 or tier 4 weight management services, not from your GP. NICE has approved tirzepatide for NHS use. Access requires a GP referral and assessment, and waiting times vary significantly by region — often several months to over a year.
How do I access Mounjaro privately?
Complete an online consultation with a UK-licensed prescriber through a registered service. Answer health questions about your BMI, medical history, and medications. If approved, your prescription goes to a GPhC-registered pharmacy for delivery. The process typically takes 24–48 hours.
What happens during the online consultation?
The prescriber assesses your BMI, reviews your health history, checks for contraindications (pregnancy, severe gastroparesis), and confirms you understand how to use the KwikPen. You'll discuss your weight loss goals and any medications you take. The consultation usually takes 10–15 minutes.
Should I keep a Mounjaro diary while taking the injection?
Yes, tracking your weight weekly, noting any side effects, and recording your dose changes helps you monitor progress and identify patterns. Use our free progress tracker to log this information consistently throughout your treatment journey.
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.