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
How Much Does 5mg Mounjaro Cost in the UK?
The cost of 5mg Mounjaro in the UK varies significantly depending on whether you access it through the NHS or privately. On the NHS, Mounjaro may be available at no cost through specialist weight management services, though access is limited and regional availability varies considerably. Privately, a 5mg dose typically costs between £129 and £180 per month depending on your provider. This dose is usually taken for 4 weeks during the dose titration phase before increasing further. Mounjaro is a prescription-only medicine, so costs only apply if you have a valid prescription from a UK-licensed prescriber.
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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.
NHS vs Private Mounjaro Pricing in the UK
NHS Access: Mounjaro may be prescribed free through NHS specialist weight management services, but availability is extremely limited and varies by region. NICE (National Institute for Health and Care Excellence) has approved tirzepatide for use within NHS tier 3 and tier 4 weight management services, but access depends on your local Integrated Care Board (ICB). Waiting lists can be several months to over a year in many areas.
Private Access: Through private prescribing, a 5mg Mounjaro KwikPen (which contains 4 weekly doses) typically costs £129–£180 per month. Costs vary by provider and may include consultation fees. The 5mg dose is a standard adjustment dose during titration — most patients move to higher doses (7.5mg, 10mg, 15mg) over subsequent weeks. Your prescriber will determine the appropriate dose progression based on your individual response.
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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.
What Affects Mounjaro Pricing and Your Total Cost
Several factors influence your actual Mounjaro cost: the dose you're prescribed (5mg is lower than maintenance doses, so costs may be lower initially), how quickly you progress through dose titration, whether you include consultation fees in private pricing, and any repeat prescription charges. If you're accessing Mounjaro privately, check whether your provider offers package pricing for multiple months. Some patients also compare costs with Wegovy (semaglutide), which is another once-weekly weight loss injection available in the UK — pricing is similar but mechanisms differ slightly. Use our free GLP-1 weight loss calculator to explore potential weight loss outcomes at different doses, which can help inform your decision alongside cost considerations.
- 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 available free on the NHS in the UK?
Mounjaro may be prescribed free through NHS specialist weight management services if you meet eligibility criteria (BMI ≥30, or ≥27 with weight-related health conditions). However, NHS access is extremely limited with long waiting lists. Availability varies significantly by region and local ICB budget allocation. Ask your GP about referral to your local specialist weight management service.
What does 5mg Mounjaro cost privately in the UK?
Private 5mg Mounjaro typically costs £129–£180 per month depending on your provider. This usually covers one KwikPen containing 4 weekly doses. Consultation fees may be additional. Costs can vary between providers, so compare options. Some services offer discounts for multiple months or higher doses.
Is 5mg Mounjaro the final dose I'll take?
No, 5mg is usually a starting or adjustment dose during the titration phase (weeks 1–4). Most patients progress through 5mg, 7.5mg, 10mg, 12.5mg, and up to 15mg maximum over several weeks. Your prescriber will adjust your dose based on how your body responds. Higher doses typically cost more if accessed privately.
How long does one 5mg Mounjaro KwikPen last?
One 5mg KwikPen contains 4 weekly doses, so it lasts approximately 4 weeks. You inject once per week. If 5mg is your maintenance dose, you'd need approximately 4–13 pens per year depending on how long you take the medication.
Can I access Mounjaro through a private GP instead of waiting for NHS?
Yes, you can access Mounjaro through private online prescribing services via UK-licensed prescribers without waiting for NHS referral. After a clinical assessment, if you're eligible, a prescription is issued and dispensed by a GPhC-registered pharmacy. This is faster than NHS routes but involves private costs.
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.