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 Increase Weight Loss on Mounjaro
If you're taking Mounjaro and want to optimise your results, understanding dose escalation, lifestyle factors, and access options is key. Weight loss on Mounjaro depends on starting at the right dose and gradually increasing it over weeks, combined with dietary changes and physical activity. This guide covers how to maximise your Mounjaro journey in the UK, including cost and access through both NHS and private routes, plus what to expect as you progress through your treatment.
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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.
Dose Escalation and Weight Loss Progression
Mounjaro works through gradual dose increases over at least 16–20 weeks. Starting at 2.5 mg, your dose typically increases every 4 weeks: 5 mg (weeks 5–8), 7.5 mg (weeks 9–12), 10 mg (weeks 13–16), 12.5 mg (weeks 17–20), and finally 15 mg (week 21 onwards). Clinical trials showed that higher doses produced greater average weight loss — around 15% at 5 mg, 19.5% at 10 mg, and 20.9% at the maximum 15 mg dose over 72 weeks. However, individual results vary significantly. Do not skip doses or increase faster than prescribed — your body needs time to adapt to each dose level. Some people feel nauseous at higher doses; your prescriber can adjust the pace or manage side effects. Combining the weekly weight loss injection with a reduced-calorie diet (typically 500 kcal deficit daily) and regular physical activity produces the best results. Use our GLP-1 weight loss calculator to project potential outcomes at different dose levels and see what realistic progress might look like for you.
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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.
Accessing Mounjaro: NHS vs Private Cost and Routes
NHS access: Mounjaro is available through NHS specialist tier 3 weight management services following NICE approval. You'll need referral from your GP, but waiting lists vary significantly by region — some areas have multi-month waits. Private access: GPhC-registered online pharmacies can issue Mounjaro prescriptions following an online clinical assessment with a UK-licensed prescriber. Private Mounjaro costs typically range from £160–£280 per month depending on dose, with costs rising as you titrate upwards. Both routes require a prescription and clinical assessment to confirm eligibility. Compare your Mounjaro costs using our BMI calculator to understand your eligibility threshold and access options in your region.
- 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 increasing my Mounjaro dose assures faster weight loss?
No — dose increases support greater average weight loss in clinical trials, but individual results vary widely. Faster weight loss isn't always safer or better; the NHS recommends losing 0.5–1 kg per week. Your prescriber will increase your dose gradually to minimise side effects and ensure sustainable results. Diet and activity matter as much as the injection dose.
How much does Mounjaro cost privately in the UK?
Private Mounjaro typically costs £160–£280 per month depending on your dose. Starting doses (2.5–5 mg) cost less; higher doses (10–15 mg) cost more. Prices vary slightly between GPhC-registered online pharmacies. Ask about package pricing for multiple months to reduce per-dose costs.
Can I get Mounjaro on the NHS quickly?
Mounjaro is available on the NHS through specialist weight management services, but waiting times vary significantly by region. Some areas have waiting lists of several months. Your GP can refer you to your local tier 3 service. Private access is faster if you meet eligibility criteria and can afford it.
What if I'm not losing weight on Mounjaro at my current dose?
Weight loss varies by individual. Ensure you're following a reduced-calorie diet and exercising regularly — the injection alone isn't enough. Side effects like nausea may reduce your appetite initially but can settle. Speak to your prescriber before your next dose increase; they may adjust timing or manage side effects differently.
Is Mounjaro more effective than other weight loss injections?
In clinical trials, Mounjaro (a dual GIP/GLP-1 agonist) showed slightly higher average weight loss than single GLP-1 injections like Wegovy. However, individual responses vary. Your prescriber will assess which medication suits your health profile and goals best.
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.