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 Pills for Men in the UK
If you're looking for weight loss pills in the UK, prescription medications are available for eligible men. The most commonly prescribed options are Mounjaro (tirzepatide) and Wegovy (semaglutide)—both once-weekly injections licensed for weight management. Access depends on your BMI, health conditions, and whether you pursue NHS or private routes. This guide explains what's available, who qualifies, and how to start a conversation with your GP about prescription weight loss medication.
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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 Weight Loss Medications for Men
Three prescription medications are currently licensed in the UK for weight management in men:
- Mounjaro (tirzepatide) — A dual GIP and GLP-1 receptor agonist. Once-weekly injection. In clinical trials, men taking the maximum 15 mg dose lost an average of approximately 20.9% of their body weight alongside diet and exercise changes.
- Wegovy (semaglutide) — A GLP-1 receptor agonist. Once-weekly injection. Clinical evidence shows average weight loss of around 14.9% body weight at the maximum 2.4 mg dose.
- Saxenda (liraglutide) — A GLP-1 receptor agonist. Daily injection. Less commonly prescribed than Mounjaro or Wegovy but still available.
All three require a prescription following a clinical assessment. Individual results vary significantly. These medications work by reducing appetite and helping you feel fuller on smaller portions, making calorie reduction easier to sustain.
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
In the UK, you can access prescription weight loss medication through two routes. NHS access is through specialist tier 3 weight management services—your GP can refer you, though waiting lists vary by region and can be lengthy. Private access is available through UK-licensed online prescribers and GPhC-registered pharmacies without an NHS referral.
To find out if you're eligible, calculate your BMI using our free BMI calculator above. Men with a BMI of 30 or above, or 27–29.9 with weight-related health conditions (such as type 2 diabetes, high blood pressure, or sleep apnoea), may qualify. Start by speaking to your GP about your weight loss goals and ask whether prescription medication might be appropriate for you.
- 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 once-weekly injections, but Mounjaro uses a dual GIP+GLP-1 mechanism while Wegovy uses GLP-1 only. Clinical trials suggest Mounjaro may produce slightly greater average weight loss, though results vary individually. Your prescriber will advise which is more suitable based on your health profile.
How much weight can men realistically expect to lose?
Clinical trials show average weight loss of 15–21% of body weight with prescription medications, but individual results vary. Your GLP-1 weight loss calculator can help estimate potential outcomes. Results depend on dose, adherence, diet, exercise, and individual metabolism. Some men lose more, some less.
Am I eligible for NHS weight loss medication?
You may be eligible if you have a BMI of 30 or above, or 27–29.9 with weight-related health conditions like diabetes or high blood pressure. Use our BMI calculator to check your starting point, then discuss eligibility with your GP or a specialist weight management service.
How do I access weight loss pills on the NHS?
Ask your GP for a referral to your local specialist weight management service (tier 3). They'll assess you and decide if prescription medication is appropriate. Waiting times vary by region. Private online prescribing offers faster access but comes at personal cost.
Are weight loss pills safe for men?
Prescription weight loss medications are licensed and have been through clinical safety trials. However, they're not suitable for everyone—contraindications include pregnancy plans, certain health conditions, and specific medication interactions. Your prescriber will assess safety before issuing a prescription.
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.