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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Male Weight Loss Plan: Prescription Medication Options in the UK
A structured male weight loss plan in the UK can include prescription medications alongside lifestyle changes. If you have a BMI of 30 or above, or 27–29.9 with weight-related health conditions, you may be eligible for prescription weight management treatment. The NHS and private prescribers offer several clinically proven options. This guide covers how these medications work, who qualifies, and how to access them through the NHS or privately.
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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 for Men
Three main prescription medications are licensed in the UK for weight management:
- Mounjaro (tirzepatide) — A dual GIP and GLP-1 receptor agonist, injected once weekly. Clinical trials showed men lost an average of 15–21% of their body weight over 72 weeks, alongside a reduced-calorie diet and increased physical activity. Doses range from 2.5 mg to 15 mg.
- Wegovy (semaglutide) — A GLP-1 receptor agonist, injected once weekly. In trials, participants lost approximately 15% of body weight. Maximum dose is 2.4 mg per week.
- Saxenda (liraglutide) — A daily GLP-1 injection. Evidence supports modest weight loss, typically 5–10% of body weight.
All three are prescription-only and require a clinical assessment to determine suitability. Individual results vary significantly based on adherence, diet, and lifestyle factors.
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.
NHS vs Private Access and How to Get Started
NHS access: Referral to a specialist tier 3 weight management service is through your GP. Eligibility and availability vary by region, and waiting lists can be lengthy. Once assessed, the NHS may prescribe eligible medications as part of a comprehensive weight management programme.
Private access: Available through GPhC-registered online prescribing services following an online clinical consultation. No NHS referral needed. Costs typically range from £129–£320 monthly depending on the medication and dose.
Start by discussing weight management options with your GP, who can refer you to specialist services or discuss private options. Use our free BMI calculator to check your current BMI category and track your progress with our weight loss progress tracker throughout your journey.
- 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 BMI qualifies me for prescription weight loss medication in the UK?
Men with a BMI of 30 or above, or 27–29.9 with weight-related health conditions (type 2 diabetes, high blood pressure, cardiovascular disease, sleep apnoea, or abnormal blood fats), may be eligible. For men of South Asian, Chinese, Black African, or Black Caribbean heritage, lower thresholds may apply. Your prescriber will assess your individual health profile.
How much weight can I expect to lose with Mounjaro or Wegovy?
Clinical trials showed average weight loss of 15–21% of body weight with Mounjaro and approximately 15% with Wegovy over 68–72 weeks. However, individual results vary significantly. These medications work alongside a reduced-calorie diet and increased physical activity — they are not a substitute for lifestyle changes.
Can I get these medications through the NHS for weight management?
Yes, Mounjaro, Wegovy, and Saxenda are available through NHS specialist tier 3 weight management services for eligible patients. Your GP can refer you for assessment. Availability and waiting times vary considerably by region. Private prescribing is also available without an NHS referral.
What are the main side effects of prescription weight loss injections?
Common side effects include nausea, diarrhoea, constipation, stomach pain, and vomiting — these typically improve as your body adjusts. Less common side effects include headache, fatigue, and injection site reactions. Serious side effects are rare but can include severe stomach pain (possible pancreatitis) or gallbladder issues. Always discuss side effects with your prescriber.
How do I know if a male weight loss plan with medication is right for me?
Speak with your GP, who can review your BMI, health conditions, current medications, and lifestyle factors. Your GP can refer you to NHS specialist services or discuss whether private prescription medication may suit you. Use our free BMI calculator and GLP-1 weight loss calculator to help inform your conversation with your GP.
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.