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
What Happens During a Mounjaro Questionnaire?
A Mounjaro questionnaire is a clinical assessment completed before prescription. It's a standard process used by UK prescribers to determine whether tirzepatide is suitable for you based on your health history, current medications, and weight management goals. The questionnaire helps identify any contraindications, existing health conditions, and whether you meet NHS eligibility criteria. Understanding what to expect makes the process smoother and helps you provide accurate information to your prescriber.
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.
What Questions Will You Be Asked?
A Mounjaro questionnaire typically covers several key areas:
- Medical history — type 2 diabetes, prediabetes, high blood pressure, cardiovascular disease, gallbladder problems, pancreatitis, or family history of medullary thyroid cancer
- Current medications — including diabetes medications (sulphonylureas, insulin), oral contraceptives, and any other prescriptions or supplements
- Allergies — any allergies to tirzepatide or any ingredients in Mounjaro
- Weight and height — to calculate your BMI and confirm eligibility (BMI 30+ or 27+ with weight-related health conditions)
- Lifestyle factors — current diet, physical activity, previous weight loss attempts, and motivation
- Pregnancy and breastfeeding status — Mounjaro is not suitable if pregnant, planning pregnancy, or breastfeeding
- Gastrointestinal history — previous or current stomach problems, as Mounjaro affects how quickly food moves through the stomach
The prescriber uses your answers to assess whether tirzepatide is clinically appropriate for you and what dose to start.
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.
How to Prepare for Your Assessment
Gather accurate information before your questionnaire to ensure a thorough assessment. Have your height and weight ready — use our free weight converter and BMI calculator to understand your current metrics if helpful. List all current medications, supplements, and any allergies. Write down any previous weight loss attempts, including whether you've used other weight loss medications. Be honest about your health conditions and family history — this information is confidential and helps your prescriber make safe decisions. If you have recent blood test results showing glucose levels or HbA1c, have these available. Consider noting your weight loss goals and what lifestyle changes you're willing to make alongside 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.
Will I automatically be prescribed Mounjaro after the questionnaire?
No. The questionnaire is an assessment to determine clinical suitability. Your prescriber will review your answers and either approve prescription if you meet criteria and have no contraindications, or explain why Mounjaro isn't appropriate for you currently. They may recommend alternative approaches or ask for additional information.
What if I'm taking oral contraceptives — does Mounjaro affect them?
Yes. Mounjaro may reduce the absorption of oral contraceptives, making them less effective. If you take the pill, you'll need to add a barrier method (condoms) or switch to a non-oral contraceptive for 4 weeks after starting Mounjaro and 4 weeks after each dose increase.
Can I get Mounjaro on the NHS through a questionnaire?
NHS prescribing is limited to specialist tier 3/4 weight management services following referral from your GP. Private online prescribers can issue prescriptions following an online questionnaire if you meet eligibility criteria. Availability and routes vary by region.
What happens if I have a history of pancreatitis or gallbladder problems?
These require careful assessment. Your prescriber will evaluate your specific history and may decide Mounjaro isn't suitable, or may prescribe with closer monitoring. Always disclose previous stomach or digestive issues, as they may affect safety.
Is the questionnaire assessment the same for Mounjaro vs Wegovy?
The core assessment is similar — both are prescription-only weight loss injections requiring clinical evaluation. However, they're different medications (tirzepatide vs semaglutide). Your prescriber will assess which is more appropriate based on your health profile and choose accordingly.
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.