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 in the UK — Cost, Access & MHRA Status
Mounjaro (tirzepatide) is an MHRA-approved prescription-only weight management injection available in the UK. Access and cost vary significantly depending on whether you pursue the NHS or private route. The MHRA granted approval for Mounjaro with additional monitoring status (Black Triangle ▼), reflecting its recent arrival on the market. Understanding your options, eligibility criteria, and the costs involved is essential before deciding how to proceed with this medication.
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.
How Much Does Mounjaro Cost in the UK?
Private Mounjaro costs in the UK typically range from £129 to £320 per month, depending on your dose and the online prescribing service you use. Costs vary because different providers structure their pricing differently—some bundle consultation and pharmacy fees, while others separate them. The starting dose (2.5 mg) is usually cheaper than higher maintenance doses like 10 mg or 15 mg. Each KwikPen contains four weekly injections, so monthly costs reflect the actual prescription cost per dose level. NHS prescriptions, where available, cost the standard NHS prescription fee (currently £9.90 per item in England), though NHS access is extremely limited. It's worth comparing prices across registered online services, as costs do vary. Remember that Mounjaro is typically used long-term for weight management, so monthly costs should be factored into your budget planning.
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.
NHS vs Private Access Routes
NHS access: The MHRA approved Mounjaro is available through NHS specialist weight management services (tier 3/4), but access is extremely limited. You must be referred by your GP to a specialist service, which can involve months of waiting. Availability depends on your local Integrated Care Board (ICB) and regional funding decisions. Most areas have very long waiting lists or no access at all due to cost pressures.
Private access: You can obtain Mounjaro through GPhC-registered online prescribing services following a brief clinical assessment. This route avoids NHS waiting lists and is available immediately if you're eligible. A UK-licensed prescriber reviews your health details online and issues a prescription if appropriate, which is then dispensed by a registered pharmacy. This is often faster but requires you to pay the full private cost.
What to Expect When Accessing Mounjaro PrivatelyThe private prescription process is straightforward. You'll complete an online health questionnaire covering your medical history, current medications, and weight. A UK-licensed prescriber reviews this information and decides whether Mounjaro is suitable for you. If approved, they issue a prescription to a GPhC-registered pharmacy, which dispenses your first KwikPen and arranges delivery. You'll receive injection training and guidance. Subsequent doses require repeat consultations—usually every 4 weeks—to monitor your progress and adjust your dose according to the standard titration schedule (2.5 mg, then increasing by 2.5 mg every 4 weeks up to 15 mg maximum). Use our GLP-1 weight loss calculator to project potential outcomes at different doses before starting. Your GP should always be informed you're using this medication.
- 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 approved by the MHRA in the UK?
Yes, Mounjaro (tirzepatide) is MHRA-approved for weight management in UK adults. It carries a Black Triangle (▼) designation, meaning it has additional monitoring requirements as a newer medication. This is standard for recently approved drugs and does not mean it is unsafe—only that safety data continues to be closely monitored.
Can I get Mounjaro on the NHS for weight loss?
Mounjaro is theoretically available through NHS specialist weight management services following NICE approval, but actual access is extremely limited due to cost and regional availability. Most areas have long waiting lists or no access. Your GP can discuss NHS options, but private access is currently more reliably available in the UK.
How much does Mounjaro cost privately per month?
Private Mounjaro costs typically range from £129 to £320 per month depending on your dose. Starting doses (2.5 mg) cost less than higher maintenance doses. Prices vary between online prescribing services, so it's worth comparing. Remember this is an ongoing cost for long-term use.
What happens at my first private consultation for Mounjaro?
You'll complete an online health questionnaire and a UK-licensed prescriber will review it. If they deem you eligible, they'll issue a prescription. A registered pharmacy dispenses your first KwikPen, provides injection training, and arranges delivery. Subsequent consultations are needed every 4 weeks to monitor progress and adjust your dose.
Is Mounjaro the same as a GLP-1 injection like Wegovy?
No. Mounjaro is a dual GIP and GLP-1 receptor agonist, while Wegovy is a GLP-1-only medication. Both are prescription-only weight management injections available in the UK, but they work via slightly different mechanisms. Clinical trials show similar weight loss outcomes on average, though individual results vary considerably.
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.