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 15 Mg Price in the UK — NHS and Private Costs
Mounjaro (tirzepatide) 15 mg is the maximum dose available in the UK for weight management. The cost varies significantly depending on whether you access it through the NHS or privately. On the NHS, the medication itself is free to patients who meet eligibility criteria, though availability varies by region. Through private UK pharmacies, a 15 mg Mounjaro KwikPen typically costs between £250–£320 per month, depending on the provider. This guide explains NHS access, private pricing, and what to expect when getting prescribed at this dose.
10,000+ calculations today · NHS-aligned thresholds · 100% free
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 Access and Eligibility for Mounjaro 15 Mg
The NHS has approved tirzepatide (Mounjaro) for weight management in specialist tier 3 weight management services. Patients do not pay for the medication itself if prescribed through the NHS, but access is limited and varies significantly by region. To be eligible, you typically need a BMI of 30 or above, or 27–29.9 with weight-related health conditions such as type 2 diabetes, high blood pressure, or sleep apnoea. For people of South Asian, Chinese, Black African, or Black Caribbean heritage, lower BMI thresholds may apply.
The NHS does not routinely start patients directly at the 15 mg dose. Most specialist services begin with 2.5 mg and escalate gradually — minimum 4 weeks between dose increases. Reaching the maximum 15 mg dose typically takes 16–20 weeks. NHS availability is extremely limited; waiting lists for specialist weight management services can exceed 12 months in many areas. Your GP can refer you to your local tier 3 service, but there is no assures of access due to regional funding constraints.
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.
Private Mounjaro 15 Mg Pricing and Access in the UK
Private UK pharmacies dispense Mounjaro following an online clinical assessment from a UK-licensed prescriber. A single 15 mg Mounjaro KwikPen (containing 4 weeks of doses) costs approximately £250–£320, depending on the provider and any additional consultation fees. Some private providers charge £120–£150 for the initial consultation.
Private access bypasses NHS waiting lists and regional variation — if clinically appropriate, you can usually begin treatment within days. However, cost is the primary barrier: at the maximum 15 mg dose, monthly costs approach £300–£350 including any consultation fees. Many users start at lower doses privately (5–10 mg) to reduce cost before escalating. Your prescriber will assess whether 15 mg is suitable based on your individual health, previous weight loss response, and tolerability at lower doses.
- 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 a 15 mg Mounjaro KwikPen cost on the NHS?
If prescribed through the NHS, Mounjaro is provided free to patients. However, NHS access is limited and varies by region — you must be referred to a tier 3 specialist weight management service. Many areas have long waiting lists of 6–18 months.
What is the private cost for Mounjaro 15 mg in the UK?
A 15 mg Mounjaro KwikPen costs approximately £250–£320 per month through private UK pharmacies. Initial prescriber consultations may add £120–£150. The exact price varies by provider.
Will the NHS prescribe me at 15 mg Mounjaro straight away?
No. NHS specialist services typically start at 2.5 mg and escalate gradually — minimum 4 weeks between dose increases. Reaching 15 mg takes approximately 16–20 weeks if tolerated.
Can I get Mounjaro 15 mg prescribed privately without NHS referral?
Yes. Private prescribers can assess and prescribe Mounjaro if clinically appropriate. You need an online consultation, and if approved, a prescription is sent to a GPhC-registered pharmacy for dispensing.
Is Mounjaro 15 mg the dose that produces the most weight loss?
Clinical trials (SURMOUNT-1) showed that 15 mg produced average weight loss of approximately 20.9% of body weight. However, significant weight loss also occurred at 5–10 mg doses, and individual results vary greatly. Your prescriber will determine the appropriate dose for you. ```
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.