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 to Pronounce Mounjaro — UK Guide
Mounjaro is pronounced "MOON-juh-ro" (emphasis on the first syllable). The active ingredient, tirzepatide, is pronounced "tir-ZEP-a-tide" (emphasis on the second syllable). If you're considering this prescription weight management injection or discussing it with your GP, knowing the correct pronunciation helps ensure clear communication with healthcare professionals. This guide explains how to say both the brand name and the active ingredient, plus essential NHS information about eligibility and access in the UK.
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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: Pronunciation and Key Information
Mounjaro pronunciation breakdown:
- "MOON" — rhymes with "soon"
- "juh" — as in "ju-jube"
- "ro" — rhymes with "go"
- Full word: "MOON-juh-ro" with stress on the first syllable
Tirzepatide pronunciation breakdown:
- "tir" — rhymes with "sir"
- "ZEP" — as in "zeppelin" (stressed syllable)
- "a" — schwa sound
- "tide" — rhymes with "wide"
- Full word: "tir-ZEP-a-tide" with stress on the second syllable
Mounjaro is a once-weekly injection licensed in the UK for weight management. It's a dual GIP and GLP-1 receptor agonist, which differs from Wegovy (semaglutide), a single GLP-1 agonist. Clinical trials showed Mounjaro helped participants lose an average of 15–21% body weight, though individual results vary significantly. It requires a prescription from a UK-licensed prescriber following a clinical assessment of your eligibility and health profile.
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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.
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NHS Access and Eligibility in the UK
In the UK, Mounjaro access depends on your route: NHS route involves referral to a tier 3 specialist weight management service through your GP, though availability and waiting times vary considerably by region and integrated care board (ICB). Private route allows prescriptions through online consultations with UK-licensed prescribers, without NHS referral. To be eligible, adults typically need a BMI of 30 or above, or 27–29.9 with weight-related health conditions like type 2 diabetes, hypertension, or cardiovascular disease. South Asian, Chinese, Black African, and Black Caribbean adults may qualify at lower BMI thresholds due to higher health risks at the same weight. Our free GLP-1 weight loss calculator can help you explore potential outcomes, and the BMI calculator above shows your personal BMI instantly.
- 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.
How do you pronounce Mounjaro correctly?
Mounjaro is pronounced "MOON-juh-ro" with stress on the first syllable. The active ingredient tirzepatide is pronounced "tir-ZEP-a-tide" with stress on the second syllable. Getting the pronunciation right helps when discussing the medication with your GP or healthcare provider.
Is Mounjaro the same as Ozempic or Wegovy?
No. Mounjaro (tirzepatide) is a dual GIP and GLP-1 receptor agonist. Wegovy (semaglutide) is a GLP-1 agonist only. Ozempic is also semaglutide but approved for type 2 diabetes, not weight management. All three are different medications with different mechanisms and doses.
How do I access Mounjaro through the NHS in the UK?
Ask your GP for a referral to a tier 3 specialist weight management service. NHS access requires a BMI of 30 or above (or 27+ with health conditions), but availability varies by region. Some areas have long waiting lists. Private prescribing offers faster access without NHS referral.
What dose of Mounjaro do I start on?
The starting dose is 2.5 mg once weekly for the first four weeks. Your dose is then increased gradually — typically moving to 5 mg, 7.5 mg, 10 mg, 12.5 mg, and up to a maximum of 15 mg. Each dose increase happens over at least four weeks, allowing your body to adjust.
What are the most common side effects of Mounjaro in the UK?
Very common side effects include nausea, diarrhoea, vomiting, and constipation — most often during dose titration. These typically ease over time. Less common but serious effects include severe stomach pain (possible pancreatitis) and gallbladder problems. Always discuss side effects with your prescriber; they can advise on management strategies.
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