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
Will Mounjaro Get Cheaper In 2026?
Mounjaro (tirzepatide) pricing in 2026 remains uncertain, though several factors could influence cost. In the UK, access depends on whether you're prescribed through the NHS or private online pharmacies. NHS provision is expanding but remains regional, whilst private prescription costs have stabilised around £129–£320 per month depending on dose. This guide explains current pricing, NHS eligibility, and what might change in 2026.
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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 Access And Current Costs
NHS access: Mounjaro is available through specialist tier 3 weight management services following NICE approval, but availability varies significantly by region. Costs to the NHS per patient are substantial, which influences regional funding decisions. Waiting lists in many areas remain lengthy.
Private prescription costs: Through GPhC-registered online pharmacies, private Mounjaro prescriptions currently range from approximately £129–£320 monthly, depending on dose strength (2.5 mg starter through 15 mg maximum). Each KwikPen contains four weeks' supply. Price reductions may occur if generic tirzepatide becomes available post-patent, though this timeline is unclear. Use our free BMI calculator and GLP-1 weight loss calculator to explore whether Mounjaro eligibility applies to you and estimate potential outcomes.
- Prices vary between private providers
- NHS access requires specialist referral
- Dose titration affects individual costs
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.
Factors That Could Affect Mounjaro Pricing In 2026
Several factors may influence 2026 pricing: increased NHS funding for weight management services could reduce waiting times and costs; competition from semaglutide (Wegovy) and other GLP-1 medications may create downward price pressure in the private market; manufacturing scale-up by Eli Lilly could lower production costs; and MHRA guidance may shift regarding tirzepatide availability. Patent expiry remains years away, so generic tirzepatide is unlikely in 2026. Regional NHS commissioning decisions will continue to shape access. Individual eligibility depends on BMI (30 or above, or 27–29.9 with weight-related health conditions) and clinical assessment by a prescriber.
- 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 on the NHS in 2026?
Yes, but availability is regional and dependent on specialist tier 3 services. NICE has approved tirzepatide for NHS use, but funding and waiting lists vary significantly by area. Your GP can refer you if you meet eligibility criteria, though NHS waiting times remain substantial in many regions.
What's the typical private prescription cost for Mounjaro in 2026?
Private costs currently range from approximately £129–£320 per month depending on dose. Prices may shift based on provider competition and supply changes, but expect similar ranges in 2026. Costs include the four-dose KwikPen and prescriber assessment.
Will Mounjaro become cheaper in 2026?
Potentially, yes—but modest changes are most likely. Private market competition, increased NHS provision, and manufacturing efficiency could reduce costs slightly. Generic tirzepatide is unlikely before 2027–2028, so branded Mounjaro pricing will remain the primary driver.
How do Mounjaro costs compare to Wegovy?
Both are similar in private prescription cost (£129–£320 monthly). Wegovy may have slightly different pricing depending on dose titration schedule. Both require clinical assessment. Compare potential outcomes using our GLP-1 weight loss calculator.
What determines Mounjaro eligibility in the UK?
Adults with a BMI of 30 or above, or 27–29.9 with weight-related health conditions (type 2 diabetes, hypertension, cardiovascular disease, sleep apnoea), may be eligible. Lower thresholds apply for South Asian, Chinese, Black African, or Black Caribbean adults. A prescriber assesses suitability individually.
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.