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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Finding Affordable Monjaro in the UK
Monjaro (tirzepatide) is a prescription-only weekly weight loss injection that works as a GLP-1 and GIP receptor agonist. Many people searching for "cheap Monjaro" are looking for affordable access to this medication in the UK. The cost varies significantly depending on whether you access it through the NHS or private prescribing services. Understanding your options and what affects pricing can help you make an informed decision about whether Mounjaro is right for you. This guide explains UK Monjaro costs, eligibility criteria, and how to access this medication affordably.
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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.
How Much Does Monjaro Cost in the UK?
Monjaro pricing in the UK varies depending on your access route:
- NHS access: Free through the NHS if prescribed by a tier 3 or tier 4 specialist weight management service, but access is regional and waiting lists can be lengthy
- Private online prescribing: Typically £129–£320 per month depending on your dose, with prices usually lower at starter doses (2.5 mg and 5 mg) and higher at maintenance doses (10 mg and 15 mg)
- Repeat prescription costs: Monthly subscriptions may be available, reducing per-dose costs over time
The KwikPen device contains 4 weeks of doses, so monthly costs reflect one pen per month. Some private services offer discounts for longer-term commitments or multiple-month purchases. Your GIP and GLP-1 receptor agonist dose will be escalated gradually over 4-week intervals, so initial costs are typically lower than maintenance 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.
Accessing Monjaro Affordably — Your Options
NHS route (free but may have long waits): Ask your GP for a referral to your local tier 3 specialist weight management service. Monjaro is now approved by NICE for NHS use, but availability and waiting times vary significantly by region (ICB). Some areas have waiting lists of 6–12 months or longer.
Private route (faster but costs apply): Online consultations with UK-licensed prescribers are available without NHS referral. A clinical assessment determines eligibility, and prescriptions are dispensed by GPhC-registered pharmacies. This route is typically faster than NHS referral pathways, with access possible within days rather than months. Use our free GLP-1 weight loss calculator to estimate potential results at different Monjaro 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.
Is Monjaro free on the NHS?
Monjaro is available free through the NHS if prescribed by a tier 3 or 4 specialist weight management service. However, access is regional and waiting times can be significant. You'll need a GP referral to access these services. Availability varies widely depending on your local ICB.
What's the cheapest way to get Monjaro in the UK?
The NHS is free if you can access it, but waits can be 6–12+ months. Private online prescribing typically costs £129–£320/month depending on dose. Starter doses are cheaper than maintenance doses. Some providers offer discounts for longer commitments.
Why do Monjaro prices vary between private providers?
Prices vary based on dose (starter doses cost less), whether you're a new or existing patient, and the provider's cost structure. Some offer subscription discounts, package deals, or loyalty pricing. Always compare prices across GPhC-registered pharmacies offering UK prescriptions.
Can I switch from Monjaro to a cheaper alternative like Wegovy?
Wegovy (semaglutide) is also a GLP-1 receptor agonist but is a different medication with different dosing. Switching requires clinical assessment and a new prescription. Prices differ between medications and providers, so comparison shopping is worthwhile. Discuss options with your prescriber.
What happens to Monjaro costs if I need to escalate doses?
Monjaro starts at 2.5 mg (lowest cost) and increases gradually every 4 weeks to a maximum of 15 mg. As your dose increases, your monthly cost typically increases. Calculate your BMI using our free tool to check eligibility, then discuss dose progression with your prescriber during your assessment.
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.