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 Week 6: Cost and Access in the UK
By week 6 of Mounjaro treatment, you'll typically be on your first maintenance dose following the initial titration phase. Understanding the cost and access routes available in the UK — whether through the NHS or private prescription — helps you plan your weight management journey effectively. This guide covers your options for continuing treatment and what to expect financially.
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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.
UK Private Prescription Costs for Mounjaro
In the UK, private Mounjaro prescriptions are the most accessible route for most people, as NHS availability remains limited and waiting lists can be lengthy. Week 6 typically places you on a 5mg dose, which forms part of the standard maintenance phase after starting at 2.5mg in week 1.
Private costs typically range from £129 to £320 per month depending on your current dose, provider, and whether you're on a fixed subscription plan. At week 6 (5mg dose), you'll generally be at the lower end of this range. These costs include the online clinical assessment, prescription, and medication supply. The KwikPen delivery usually arrives within 2–5 working days once dispensed. Some providers offer subscription discounts or bulk-purchase savings if you commit to multiple months of treatment, which can reduce your monthly cost. Always check whether the quoted price includes the clinical consultation or if that's charged separately.
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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: Which Route Is Right for You?
NHS access is free but significantly limited. NICE approved tirzepatide for NHS specialist weight management services, but access depends on your regional Integrated Care Board (ICB). You'll need referral from your GP to a tier 3 or tier 4 specialist weight management service, and waiting times can be 6–18 months in many areas. If you're already on the NHS pathway, continue with your specialist team.
Private access is faster: you can start within 1–2 weeks of your initial online assessment. You'll need a valid UK prescription from a GPhC-registered pharmacist or doctor. Use our GLP-1 weight loss calculator to project your expected weight loss at your current dose, and discuss affordability with your prescriber before starting. The progress tracker helps monitor your results week by week.
If you're exploring Mounjaro versus Wegovy, both are once-weekly GLP-1 (or GLP-1 plus GIP) injections available privately in the UK. Mounjaro is a dual GIP and GLP-1 receptor agonist starting at 2.5mg, while Wegovy is a GLP-1-only medication starting at 0.25mg. Clinical trials suggest Mounjaro may offer slightly higher average weight loss (15–21% versus 15% for Wegovy), though individual results vary significantly. Private costs are broadly similar. Your prescriber will assess which is more suitable for your health profile.
- 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 per month in the UK?
Private prescriptions typically cost £129–£320 per month depending on dose and provider. Week 6 (5mg) usually sits in the lower-to-middle range. NHS access is free but has lengthy waiting lists and regional restrictions. Some private providers offer multi-month subscription discounts.
Can I get Mounjaro on the NHS at week 6?
NHS access to tirzepatide is available through specialist tier 3/4 weight management services following NICE approval, but availability and waiting times vary greatly by region (ICB). Most people access Mounjaro privately due to NHS waiting lists. Ask your GP about referral if you meet eligibility criteria.
What's included in the private prescription cost?
Costs typically include the online clinical assessment, prescription issued by a licensed UK prescriber, and the medication supply. Delivery is usually included. Check with your provider whether consultation fees are separate or bundled. Some offer ongoing prescriber support as part of the service.
Is Mounjaro KwikPen cheaper if I buy multiple pens at once?
Some private providers offer discounts for bulk purchases or multi-month subscriptions (typically 3–6 months). This can reduce your monthly cost by 10–20%. Compare providers before committing, and ask about flexible payment plans if cost is a concern.
Why is Mounjaro more expensive than some other GLP-1 medications?
Mounjaro is a dual GIP and GLP-1 receptor agonist (a newer mechanism than Wegovy's single GLP-1 action). Pricing reflects development costs and patent protection. Clinical trials show it may produce slightly higher average weight loss, though results vary individually. Your prescriber can discuss cost-benefit for your situation.
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.