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 Available Orally in the UK?
There is no oral (tablet) form of Mounjaro available in the UK. Mounjaro is only available as a once-weekly injection using a pre-filled KwikPen device. This injectable form has been approved by the MHRA for weight management in UK adults. While Eli Lilly has researched oral formulations globally, these are not yet licensed in the UK. If you're exploring Mounjaro as a weight loss option, understanding how to access the injection and what it costs — whether through the NHS or privately — is essential for making an informed decision about whether it's right for you.
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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 Mounjaro Cost in the UK?
Mounjaro costs vary significantly depending on where you access it. Through NHS specialist weight management services, the medication may be free at the point of use if you meet eligibility criteria and are referred by your GP — though availability and waiting times vary considerably by region. Via private online prescribing, a single KwikPen (containing 4 weekly doses) typically costs between £129 and £320 per month, depending on your dose. Starting doses like 2.5 mg are usually at the lower end of this range, while higher maintenance doses (10 mg to 15 mg) cost more. Some private prescribers offer tirzepatide (the generic active ingredient) at slightly lower prices than the branded Mounjaro. Costs may include the consultation fee, the prescription fee, and the medication itself — clarify the total cost upfront with any provider. Using our GLP-1 weight loss calculator can help you understand potential outcomes at different dose levels.
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 to Getting Mounjaro
NHS route: Ask your GP for a referral to your local tier 3 or tier 4 specialist weight management service. NICE has approved tirzepatide for use within NHS services for eligible adults. However, waiting lists can extend from weeks to over a year depending on your region, and access varies significantly across the UK. Some ICBs (Integrated Care Boards) have limited availability.
Private route: Complete an online consultation with a UK-licensed GP or prescriber. If clinically appropriate, a prescription is issued and dispensed by a GPhC-registered pharmacy. This typically takes 24–48 hours. No NHS referral is needed. You pay privately for each prescription. Track your progress with our free progress tracker alongside whichever route you choose.
- 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 an oral tablet form of Mounjaro available in the UK?
No. Mounjaro is only available as a once-weekly injection in the UK. There is no licensed oral (tablet) version. The injection is administered using a pre-filled KwikPen device into the stomach, thigh, or upper arm. Always inject as directed by your prescriber.
How long does it take to get Mounjaro on the NHS?
Waiting times vary significantly by region. Many areas have waiting lists of 6–12 months or longer for tier 3 specialist weight management services. Some regions have shorter waits or faster access. Contact your local ICB or ask your GP about current waiting times in your area.
Can I get Mounjaro privately without seeing an NHS GP first?
Yes. You can access Mounjaro through private online prescribing without an NHS referral. You'll complete an online consultation with a UK-licensed prescriber who assesses your medical history and suitability. If approved, a prescription is issued to a GPhC-registered pharmacy. This is faster than the NHS route but you pay the full cost privately.
What does a private online Mounjaro consultation involve?
You complete a detailed health questionnaire covering weight, medical history, current medications, allergies, and lifestyle. The prescriber reviews this and may contact you with follow-up questions. If you're suitable, a prescription is issued. Consultations typically cost £20–£50 and are often refunded if a prescription is issued.
Is Mounjaro more expensive than Wegovy in the UK?
Costs are comparable between Mounjaro and Wegovy (semaglutide) when purchased privately — both typically range from £129–£320 per month depending on dose. Both are prescription-only and require clinical assessment. Your prescriber will advise which is more suitable based on your individual health. Compare outcomes using our GLP-1 weight loss calculator.
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.