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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Weight Loss Routine For Men: UK Medication Options
A successful weight loss routine for men combines lifestyle changes with, for eligible individuals, prescription medication support. If you're struggling with weight management in the UK, you may qualify for prescription weight loss treatment alongside a reduced-calorie diet and increased physical activity. This guide covers your options, eligibility criteria, and how to start a conversation with your GP about prescription weight management options available to UK adults.
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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.
UK-Licensed Prescription Weight Loss Options
Three prescription weight loss medications are currently licensed in the UK for weight management in adults: Mounjaro (tirzepatide), Wegovy (semaglutide), and Saxenda (liraglutide). Mounjaro and Wegovy are once-weekly injections, whilst Saxenda is a daily injection.
In clinical trials, these GLP-1 medications helped participants lose an average of 15–21% of their body weight when combined with a reduced-calorie diet and increased physical activity. Mounjaro works as a dual GIP and GLP-1 receptor agonist, whilst Wegovy is a GLP-1 agonist only.
- Mounjaro: 2.5 mg to 15 mg once weekly; average weight loss approximately 20.9% at maximum dose
- Wegovy: 0.25 mg to 2.4 mg once weekly; average weight loss approximately 14.9%
- Saxenda: 0.6 mg to 3 mg once daily; suitable alternative if once-weekly injection not preferred
Individual results vary significantly, and these medications are prescription-only, requiring a clinical assessment before being prescribed.
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: How to Get Started
NHS access is through specialist tier 3 weight management services, typically requiring a GP referral. NHS availability varies significantly by region, and waiting lists can be lengthy in many areas. Private access is available through online consultations with UK-licensed prescribers, without requiring an NHS referral, though costs apply (approximately £129–£320 monthly depending on dose).
You may be eligible for prescription weight loss treatment if you have a BMI of 30 or above, or a BMI of 27–29.9 with weight-related health conditions such as type 2 diabetes, high blood pressure, or sleep apnoea. Use our free BMI calculator above to check your BMI, and consider speaking with your GP about whether prescription weight management might support your weight loss routine alongside dietary and activity changes.
- 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.
What's the difference between Mounjaro and Wegovy for weight loss?
Both are prescription weight loss injections available in the UK. Mounjaro (tirzepatide) is a dual GIP and GLP-1 agonist, whilst Wegovy (semaglutide) is a GLP-1 agonist only. Clinical trials showed Mounjaro produced slightly higher average weight loss (approximately 20.9%) compared to Wegovy (approximately 14.9%) at maximum doses, though individual results vary considerably. Your prescriber will assess which is most suitable for you.
Am I eligible for prescription weight loss medication in the UK?
You may be eligible if you have a BMI of 30 or above, or 27–29.9 with weight-related health conditions like type 2 diabetes, high blood pressure, sleep apnoea, or cardiovascular disease. Check your BMI using our free calculator above, then speak with your GP about referral to specialist weight management services or discuss private prescribing options.
How quickly will I lose weight on these medications?
The NHS recommends sustainable weight loss of 0.5–1 kg per week. Prescription GLP-1 medications may support faster initial loss in clinical trials, but results depend on calorie intake, physical activity, genetics, and individual metabolism. Our GLP-1 weight loss calculator can help you estimate potential outcomes at different doses alongside lifestyle changes.
Can I get prescription weight loss medication on the NHS?
Yes, NICE has approved tirzepatide (Mounjaro) for NHS specialist weight management services. Access varies significantly by region and availability. You'll need a GP referral to tier 3 specialist services. Waiting lists can be long. Private prescribing is an alternative if NHS access is limited in your area.
What should I discuss with my GP about weight loss medication?
Ask your GP about: your BMI and weight-related health conditions; referral to NHS specialist weight management services; whether you're eligible for prescription medication; private prescribing options if NHS waiting times are lengthy; and how medication fits alongside diet and exercise changes to your weight loss routine.
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.