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
Weight Loss Shakes For Men — UK Options Explained
Weight loss shakes are popular meal replacements, but for men looking for more effective weight management in the UK, prescription medications may be an option. If you have a BMI of 30 or above (or 27+ with weight-related health conditions), you may be eligible for GLP-1 medications like Mounjaro or Wegovy. These are prescription-only injectable treatments that work differently from shakes — they help reduce appetite and support sustainable weight loss alongside dietary changes. This guide explains prescription weight management options available to UK men and how to find out if you're eligible.
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.
UK-Licensed Prescription Weight Loss Medications
For men seeking prescription weight loss medication in the UK, three main options are currently licensed: Mounjaro (tirzepatide), a dual GIP and GLP-1 receptor agonist; Wegovy (semaglutide), a GLP-1 receptor agonist; and Saxenda (liraglutide), another GLP-1 option. Clinical trials show Mounjaro helped men lose an average of 15–21% of body weight, whilst Wegovy achieved approximately clinically studied weight loss on average — though individual results vary significantly. Unlike weight loss shakes, these medications require a prescription and clinical assessment. Eligibility depends on your BMI and whether you have weight-related health conditions such as type 2 diabetes, high blood pressure, or cardiovascular disease. Calculate your personal BMI using our free BMI calculator above to check if you might qualify. These medications work by reducing appetite and supporting feeling fuller after smaller meals, making them particularly effective when combined with dietary changes and increased physical activity.
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 — How to Get Started
In the UK, prescription weight loss medication is available through two routes. NHS access is through specialist tier 3 weight management services — you'll need a GP referral, though availability varies significantly by region and waiting lists can be lengthy. Private access is available through GPhC-registered online prescribing services following a clinical assessment with a UK-licensed prescriber. Start by speaking to your GP, who can assess your individual health situation and discuss whether prescription weight loss treatment is suitable for you. Your GP can also refer you to NHS specialist services if appropriate. Use our free GLP-1 weight loss calculator to explore potential outcomes at different doses, and track your progress with our free progress tracker once you begin treatment. Remember: prescription weight loss medications are most effective when combined with lifestyle changes, not as a replacement for them.
- 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.
Are weight loss shakes as effective as prescription medication?
Weight loss shakes are meal replacements that reduce calorie intake, supporting modest weight loss. Prescription GLP-1 medications work differently — they reduce appetite at a hormonal level. Clinical trials show prescription medications achieve greater average weight loss (15–21%) than shakes alone, though individual results vary. The best approach combines diet, activity, and professional support.
What is the eligibility criteria 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 a weight-related health condition (type 2 diabetes, high blood pressure, cardiovascular disease, or sleep apnoea). For South Asian, Chinese, Black African, or Black Caribbean men, lower thresholds apply. Your GP or prescriber will assess your individual eligibility following a clinical assessment.
How much does prescription weight loss medication cost on the NHS?
Prescription weight loss medications are available through NHS specialist weight management services, though availability and waiting times vary by region. Private prescriptions typically cost £129–£320 per month depending on the medication and dose. Your GP can discuss NHS options and referral pathways available in your area.
What are the main side effects of GLP-1 weight loss injections?
Common side effects include nausea, diarrhoea, constipation, and stomach discomfort — typically mild and temporary. Most men adjust within a few weeks as doses increase gradually. Serious side effects are rare but include severe stomach pain or allergic reactions. Your prescriber will discuss all risks and monitor your response during treatment.
Can I use weight loss shakes alongside prescription medication?
Yes, many men combine prescription medication with structured meal planning or shakes as part of a comprehensive approach. However, discuss this with your prescriber first, as GLP-1 medications already significantly reduce appetite. Your healthcare team can advise on the best combination for your individual goals and health situation.
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.