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
Is Mounjaro Going Up In Price In September?
Mounjaro (tirzepatide) pricing in the UK can vary, and there are often questions about whether costs increase at specific times of year. Unlike medicines available through the NHS, private prescription costs are set by individual providers and pharmacies, so prices may change. If you're considering Mounjaro as a weight management option, understanding current pricing and access routes — whether through NHS specialist services or private prescription — can help you plan ahead. Our GLP-1 weight loss calculator can help you explore potential outcomes at different doses.
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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.
Understanding Mounjaro Costs In The UK
Mounjaro is available in the UK through two main routes: NHS specialist weight management services and private prescription via registered pharmacies. On the NHS, tirzepatide is provided at no cost to eligible patients through tier 3 or tier 4 specialist services, though availability and waiting times vary significantly by region (ICB). Private prescription costs typically range from £150–£250+ per month depending on the dose you're on and the pharmacy provider.
- Doses start at 2.5 mg (first four weeks) and increase gradually to a maximum of 15 mg once weekly
- Each Mounjaro KwikPen contains four weeks of injections (four pre-filled pens per dose level)
- Private providers may adjust pricing seasonally or in response to supply costs, but official price increases are not typically announced for specific months
- Always check directly with your chosen provider for current pricing, as costs vary between pharmacies
If you're on a tight budget, exploring NHS routes through your GP may provide access without private costs, though waiting lists can be lengthy in some areas.
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.
What Affects Mounjaro Pricing And Availability
Tirzepatide supply and manufacturing costs can influence private prescription pricing globally, though UK-specific price changes are not automatically announced. Your prescription cost may depend on:
- The dose you're prescribed (higher doses cost more per unit)
- How many pens you order at once
- Whether you use a specialist online pharmacy or high street option
- Your prescriber's fees (online consultations may cost £20–£50 separately)
To compare costs fairly, use our free BMI calculator to confirm your eligibility, then contact multiple UK pharmacies for quotes on your prescribed dose. NHS referral to specialist weight management services remains the most cost-effective route if you qualify and can access it within reasonable waiting times.
- 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.
Does Mounjaro price increase every September in the UK?
No official September price increase is standard for Mounjaro across UK pharmacies. Private prescription prices vary by provider and may change at different times, but they're not tied to a specific month. NHS provision has no cost to eligible patients. Always check with your specific pharmacy or prescriber for current pricing.
Why might Mounjaro cost more in some months?
Private pharmacy costs can fluctuate due to manufacturing supply, currency exchange rates (Mounjaro is made by US-based Eli Lilly), and individual pharmacy pricing strategies. These changes aren't always predictable or publicised, so comparing quotes across providers is recommended.
Can I get Mounjaro through the NHS to avoid costs?
Yes, if you meet eligibility criteria (BMI ≥30 or BMI 27–29.9 with weight-related health conditions) and are referred to a tier 3 specialist weight management service by your GP. NHS provision is free, but waiting lists vary by region and can be several months long.
What's included in the monthly cost of private Mounjaro?
The quoted price typically covers the Mounjaro KwikPen (four weeks of pre-filled injections at your dose level). Prescriber consultation fees may be separate (£20–£50 online). Always clarify what's included before purchasing, and factor in repeat prescription costs if you plan long-term treatment.
Is there a cheaper alternative to Mounjaro for weight management in the UK?
Wegovy (semaglutide) and Saxenda (liraglutide) are other GLP-1 medications licensed for weight management in the UK, with similar private prescription costs. Prices vary between providers, so comparing across different weight loss medications and pharmacies may help you find the most affordable option for your circumstances.
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.