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 Injection Price Comparison in the UK
If you're considering Mounjaro (tirzepatide) for weight management in the UK, cost is likely a key factor. Mounjaro is available through both NHS specialist services and private online prescribing, with significantly different pricing structures. This guide breaks down current UK Mounjaro costs, how pricing varies by dose, and what to expect whether you access it through the NHS or privately. We'll also help you understand how Mounjaro compares to other prescription weight loss injections available in the UK, and how to use our free GLP-1 weight loss calculator to estimate potential results before you commit.
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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 Costs in the UK
NHS access: Mounjaro is approved by NICE for use within NHS specialist weight management services. However, cost to the patient is typically £0 at the point of prescription (covered by the NHS). The catch: access is restricted to specialist tier 3 and 4 weight management services, usually reached by GP referral. Waiting lists vary dramatically by region and ICB (Integrated Care Board) — some areas have waiting lists of 12+ months, whilst others have limited or no access. Not all regions fund Mounjaro equally.
Private access: Through UK-licensed prescribers and GPhC-registered pharmacies, Mounjaro costs vary by dose and provider, typically ranging from £129–£320 per month for a single KwikPen (4 weeks' supply). Prices vary because different providers set different rates. Private access does not require NHS referral — you complete an online clinical assessment with a UK-licensed prescriber, who determines if Mounjaro is appropriate for you, then the prescription is dispensed by a registered pharmacy.
- Starter dose (2.5mg): Typically £129–£179 per month
- Standard doses (5–10mg): Typically £179–£249 per month
- Higher doses (12.5–15mg): Typically £249–£320 per month
Prices fluctuate based on supply, demand, and individual pharmacy margins. Always check current prices with multiple providers before committing.
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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.
How Mounjaro Pricing Compares to Other Weight Loss Injections
Mounjaro is one of three UK-licensed prescription weight loss injections; the others are Wegovy (semaglutide) and Saxenda (liraglutide). Privately, Wegovy pricing is broadly similar to Mounjaro — typically £129–£299 per month depending on dose. Saxenda, which is a daily injection rather than a weekly one, may be slightly cheaper per dose but requires daily administration. All three are prescription-only and require clinical assessment. On the NHS, cost to patients is typically £0, but availability is extremely variable by region and waiting times can be substantial. Use our free weight loss calculator to compare estimated results across different doses before deciding which weekly weight loss injection might suit your goals and circumstances.
- 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.
Why is Mounjaro more expensive privately than the NHS?
On the NHS, Mounjaro is free to patients because the NHS funds it directly through specialist weight management services. Privately, the cost reflects the wholesale price to the pharmacy, prescriber assessment fees, and pharmacy margin. Private providers also incur higher operational costs than the NHS. Regional NHS availability and waiting lists can be 12+ months, which is why some people choose private access for faster initiation.
Can I get Mounjaro on prescription privately without seeing my GP first?
Yes. Private UK-licensed prescribers will complete an online clinical assessment and issue a prescription if appropriate — you do not need a GP referral. However, your prescriber will ask about your medical history, BMI, weight-related health conditions, and current medications to ensure Mounjaro is safe for you. This assessment protects your health.
Is the cost of Mounjaro worth it compared to diet and exercise alone?
Clinical trials show Mounjaro helps an average of 15–clinically studied weight loss alongside diet and exercise. Individual results vary. Whether the cost is worth it depends on your personal circumstances, health goals, and ability to pay. Discuss with your GP or a healthcare professional whether prescription weight management support aligns with your weight loss plan.
Does private Mounjaro cost include the prescriber consultation?
Pricing structures vary by provider. Some include prescriber consultation in the stated price; others charge consultation separately (typically £40–£100) on top of medication cost. Always clarify the total cost upfront — ask what is included in the quoted price before you purchase.
Can I switch between NHS and private Mounjaro?
Technically yes, but it requires careful coordination. If you start privately and wish to switch to NHS, you would need to be referred to your local NHS specialist weight management service (your GP can refer). Conversely, if you move from NHS to private, you simply start a new private prescription. Always inform your healthcare providers about any medication changes.
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.