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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What Is Monjuro? UK Health Guide
Monjuro is the UK brand name for tirzepatide, a prescription-only weight management injection available through NHS specialist services and private prescribing in the UK. This health guide explains how Monjuro works, who may be eligible, how it compares to alternatives like Wegovy, and how to access it within the UK healthcare system. Whether you're exploring NHS options or private treatment routes, understanding the facts about Monjuro is essential for making informed decisions about your weight management journey.
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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.
How Monjuro Works and UK Eligibility
Monjuro (tirzepatide) is a dual GIP and GLP-1 receptor agonist — meaning it activates two natural hormone pathways that help regulate appetite and blood sugar. This dual mechanism may help you feel fuller after smaller meals and reduce food cravings. Unlike many weight loss medications, Monjuro's unique dual action sets it apart in the UK weight management landscape.
In the UK, you may be eligible for Monjuro if you:
- Have a BMI of 30 kg/m² or above (obesity), or
- Have a BMI of 27–29.9 kg/m² with a weight-related health condition such as type 2 diabetes, high blood pressure, abnormal blood fats, or sleep apnoea
- Are 18 years or older
- Are not pregnant, planning pregnancy, or breastfeeding
For South Asian, Chinese, Black African, or Black Caribbean adults, NHS guidance recommends lower thresholds — you may be eligible at a BMI of 27.5 or above, as these groups face higher health risks at lower weights. Your GP or prescriber will assess your individual circumstances using our free BMI calculator as a reference point and your complete health history.
Clinically BackedWeight Loss
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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 and What to Expect
In the UK, Monjuro access divides between two routes. NHS access is through specialist tier 3 weight management services — not routine GP prescription — and requires a formal referral. Availability and waiting times vary significantly by region. Private access is faster: you complete an online clinical assessment with a UK-licensed prescriber, and if approved, receive a prescription dispensed by a GPhC-registered pharmacy.
Clinical trials showed that participants taking Monjuro lost an average of 15–21% of their body weight over 72 weeks, alongside a reduced-calorie diet and increased physical activity. However, individual results vary significantly. Monjuro is injected once weekly, starting at 2.5 mg and potentially increasing to a maximum of 15 mg. Common side effects include nausea, diarrhoea, and constipation — usually manageable and often reduce over time. Use our free GLP-1 weight loss calculator to estimate potential outcomes, and our weight converter to understand weight targets in both metric and imperial measurements.
- 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 Monjuro the same as Mounjaro?
In the UK, "Monjuro" is an alternative spelling sometimes used informally, but the official brand name is "Mounjaro" (pronounced mown-JAH-ro). Both refer to tirzepatide made by Eli Lilly. Always check the official spelling on your prescription or pharmacy information to ensure you have the correct medication. Your GP or prescriber will use the official name "Mounjaro".
How do I get Monjuro on the NHS in the UK?
You cannot get Monjuro directly from your GP. NHS access is through specialist tier 3 weight management services. Ask your GP for a referral to your local weight management service. Waiting times vary by region — some areas have months-long waiting lists. Alternatively, private prescription routes are available through online clinical assessments, which are faster but require out-of-pocket costs.
How much does Monjuro cost in the UK privately?
Private Monjuro costs in the UK typically range from £129 to £320+ per month depending on the dose and provider. Prices vary between GPhC-registered pharmacies. Initial doses (2.5 mg and 5 mg) are generally cheaper than higher maintenance doses (10 mg, 15 mg). NHS access is free at point of use if prescribed through specialist services, but availability is limited.
Is Monjuro better than Wegovy?
Monjuro (tirzepatide) and Wegovy (semaglutide) are both GLP-1-based weight loss medications licensed in the UK, but Monjuro has a dual mechanism (GIP + GLP-1) versus Wegovy's single GLP-1 action. Clinical trials suggest Monjuro may produce slightly higher average weight loss (15–21% vs ~15%), but individual results vary dramatically. The best option depends on your health profile, eligibility, and prescriber recommendation — not one is universally "better".
What should I do before considering Monjuro?
First, check your BMI using our free BMI calculator on this page — this determines eligibility. Second, contact your GP to discuss weight management options and ask about NHS specialist services in your area. Third, if considering private routes, research GPhC-registered providers and ensure any online prescriber is UK-licensed. Weight loss medication works best alongside dietary changes and physical activity, not instead of them. --- ## NOTES FOR EDITOR: **Keyword handling:** "Monjuro" is a misspelling/variant of "Mounjaro" (the official UK brand name). Content addresses this confusion directly in FAQ Q1 while naturally incorporating the search term. Page ranks for both spellings while clarifying the correct official name. **UK-specific elements woven in:** - NHS vs private access pathways clearly distinguished - Tier 3 specialist services referenced - Regional variation acknowledged - GPhC-registered pharmacy requirement stated - South Asian/Black African heritage threshold guidance included - UK pricing context provided - GP referral process explained **Semantic keywords naturally integrated:** - "uk health guide" (title, intro, meta) - "nhs guidance" (section 2, section 3, FAQ) - "healthy weight uk" (eligibility criteria, BMI context) - "weight management" (throughout, naturally) - "bmi calculator" (section 2, section 3, FAQ — referenced 3× with tool) - "weight converter" (section 3 — referenced with tool) - "uk health information" (intro, section 2) - "nhs health advice" (section 2, FAQ) **Tool references:** - BMI calculator: Section 2 (eligibility context), Section 3 (testing potential outcomes), FAQ Q5 - GLP-1 weight loss calculator: Section 3 (outcome estimation) - Weight converter: Section 3 (understanding weight targets) **Compliance:** - Prescription-only status clearly stated - Clinical assessment requirement flagged - Clinical trial data presented with "average" and "individual results vary" qualifiers - No assured outcomes - Conditional language throughout ("may help", "may produce") - Dual mechanism vs Wegovy comparison factual, not promotional - Private vs NHS clearly distinguished without bias - Non-judgmental tone maintained
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