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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How Much Do Mounjaro Injections Cost in the UK?
Mounjaro (tirzepatide) is available in the UK through both NHS specialist services and private online prescription routes, but costs vary significantly. If you're looking for affordable access to this once-weekly injection, it's important to understand your options. The cost depends on whether you pursue NHS funding—which involves a lengthy referral process—or access it privately through a licensed UK prescriber. This guide explains the true cost of Mounjaro, where to find competitive pricing, and what the online consultation process involves so you can make an informed decision about your weight management options.
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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.
Private Mounjaro Costs in the UK
Private Mounjaro typically costs between £129 and £320 per month depending on your starting dose and the prescribing service you use. The variation reflects different providers' pricing structures and how costs scale with dose escalation.
Cost by dose (approximate monthly ranges):
- 2.5 mg (starting dose) — £129–£180/month — typically used for weeks 1–4
- 5 mg — £150–£200/month — usual escalation point
- 10 mg — £180–£260/month — higher maintenance dose
- 15 mg (maximum dose) — £240–£320/month — maximum therapeutic dose
Each KwikPen contains four weekly injections, so you'll need one pen per month. Some providers offer discounts for larger upfront purchases, and ongoing consultations are often included in the quoted price. The lowest-cost providers operate entirely online, eliminating clinic overhead. Always check whether the quoted price includes the prescriber consultation fee, as some charge separately (typically £20–£50 for initial assessment and follow-up reviews).
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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.
NHS Access vs Private: Timeline & Reality
NHS route: Mounjaro is NICE-approved for weight management through NHS tier 3 specialist services, but access is extremely limited. You'll need a GP referral, and waiting lists can be 6–18 months in many regions. Once approved, the NHS covers the full cost, but availability varies by Integrated Care Board (ICB).
Private route: Faster and more predictable. An online consultation with a UK-licensed prescriber takes 10–15 minutes, typically via questionnaire and phone call. If approved, your prescription is sent to a GPhC-registered pharmacy and delivered within 2–3 days. No GP referral needed. The entire process takes 3–7 days from initial contact to first injection in hand. You'll have regular check-ins (usually monthly) to monitor progress and adjust doses. Use our free GLP-1 weight loss calculator to estimate potential results and make cost-benefit calculations for your situation.
- 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 there a cheaper alternative to Mounjaro for weight loss in the UK?
Yes. Saxenda (liraglutide) is often slightly cheaper at £100–£150/month but requires daily injections instead of weekly. Wegovy (semaglutide) typically costs £129–£250/month and is also once-weekly. Costs vary by provider and dose. Compare options with your prescriber, as effectiveness varies between individuals.
Can I get Mounjaro free on the NHS?
Yes, if approved through your local NHS tier 3 weight management service. However, waiting lists are very long (often 6–18 months) and availability depends on your ICB region. Private access is faster but involves upfront costs, though some people find this worthwhile for quicker access.
What's included in the private prescription cost?
Usually the medication itself (one KwikPen = four weekly doses), the initial prescriber consultation, and follow-up reviews. Some providers include unlimited messaging support. Check whether your quoted price includes consultations, as some add £20–£50 per check-in separately.
How long does a private Mounjaro prescription take to arrive?
Typically 3–7 days from initial consultation. You complete a questionnaire and phone call with a UK-licensed prescriber (10–15 minutes), they issue a prescription if appropriate, and a GPhC-registered pharmacy dispenses and delivers within 2–3 days.
Why does Mounjaro cost more than Wegovy when both are once-weekly?
Mounjaro (tirzepatide) is a dual GIP/GLP-1 agonist, while Wegovy (semaglutide) is a GLP-1-only agonist. The dual mechanism may explain slightly higher pricing, though both are competitively priced. Clinical trial data suggests Mounjaro achieved marginally higher average weight loss, which some providers reflect in pricing. Individual results vary significantly.
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.