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
Free tracker included with every download this week
Mounjaro 5mg Prices in the UK — What You Need to Know
The cost of Mounjaro 5mg in the UK depends on whether you access it through the NHS or privately. The 5mg dose is typically the first maintenance dose reached during tirzepatide treatment, after the initial 2.5mg starting phase. NHS access is limited and involves waiting for specialist tier 3 weight management services, while private prescription routes offer faster access through online clinical assessment. Understanding your options, eligibility, and what each route costs will help you make an informed decision about weight management treatment in the UK.
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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.
Mounjaro 5mg Private Cost in the UK
Private prescription costs for Mounjaro 5mg in the UK typically range from £129 to £180 per month, depending on the prescribing provider and pharmacy. This usually covers the KwikPen device containing four weekly doses (one month's supply). Private access is available through GPhC-registered online prescribers who conduct a brief clinical assessment before issuing a prescription — this process usually takes 24–48 hours. The 5mg dose represents your first escalation from the starting 2.5mg dose and is usually reached by week 5 of treatment. Private routes bypass NHS waiting lists entirely, making them faster, though they involve direct out-of-pocket costs. Each KwikPen contains one month's supply and costs are per pen, not per individual injection.
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 Access vs Private Routes for Mounjaro
NHS access to Mounjaro, including the tirzepatide 5mg dose, is available through specialist tier 3 weight management services but only after GP referral and assessment. NHS waiting times vary significantly by region (ICB) — some areas have waiting lists of 6–12 months or longer. Once approved by the NHS, the medication is provided free. However, many regions have strict BMI or health criteria, and access is not assured. The private route costs money upfront but offers immediate access without referral delays. Your GP can advise whether NHS access is available in your area, or you can pursue private treatment independently.
- 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.
Is Mounjaro 5mg available on the NHS in the UK?
Yes, Mounjaro is NICE-approved for NHS use within specialist tier 3 weight management services. However, availability and waiting times vary significantly by region. You'll need GP referral and specialist assessment. Private prescription routes offer faster, direct access without NHS waiting lists.
How much does a Mounjaro 5mg KwikPen cost privately in the UK?
Private Mounjaro 5mg typically costs £129–£180 per month per KwikPen. Each pen contains four weekly doses. Costs vary by prescriber and pharmacy. This is paid directly and is not covered by NHS prescription charges.
What's included in the Mounjaro 5mg price?
The price covers the KwikPen device (pre-filled injection pen) containing four 5mg doses. You may also need to pay for the online clinical assessment (often £20–£50), though some providers include this. Shipping is usually included or a small additional fee.
How do I get a Mounjaro 5mg prescription privately in the UK?
Register with a GPhC-registered online prescribing service, complete an online health questionnaire, and have a brief consultation with a UK-licensed prescriber. If approved, your prescription is issued and sent to a registered pharmacy for dispatch. The whole process typically takes 24–48 hours.
Why is Mounjaro 5mg the maintenance dose after 2.5mg?
Mounjaro uses a dose titration schedule — you start at 2.5mg for 4 weeks, then escalate to 5mg for 4 weeks. The 5mg dose is the first maintenance dose where many people stabilise. If needed, the dose continues escalating weekly up to 15mg maximum, depending on individual response and tolerability.
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.