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 Detox Drinks — UK Medication & Health Guide
Homemade detox drinks are popular for weight loss, but evidence for their effectiveness is limited. This guide explains what detox drinks actually do, and introduces prescription weight management options available in the UK for adults eligible for medical support. For serious weight loss, prescription medication alongside diet and exercise can offer evidence-based results.
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 Management Options
If you're looking for clinically proven weight management in the UK, prescription medications are available through both NHS and private prescribing. Three medications are currently licensed for weight management:
- Mounjaro (tirzepatide) — a GIP and GLP-1 receptor agonist, once weekly injection. Clinical trials showed an average weight loss of 15–21% body weight.
- Wegovy (semaglutide) — a GLP-1 receptor agonist, once weekly injection. Average weight loss in trials was approximately 15% body weight.
- Saxenda (liraglutide) — a GLP-1 receptor agonist, once daily injection. Evidence supports modest weight loss alongside diet and exercise.
All are prescription-only medicines requiring clinical assessment. Our GLP-1 weight loss calculator can help you estimate potential results if you qualify for these treatments.
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 — Getting Weight Loss Support in the UK
NHS access: Referral through your GP to a tier 3 specialist weight management service. Eligibility typically requires a BMI of 30 or above, or BMI 27–29.9 with weight-related health conditions like type 2 diabetes or high blood pressure. NHS availability varies significantly by region. Check your local integrated care board (ICB) for services.
Private access: Available through UK-licensed prescribers following an online clinical assessment, without NHS referral. Use our BMI calculator above to check if you fall in the eligible range, then speak with your GP or explore private prescribing options to discuss which approach suits you best.
- 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.
Do homemade detox drinks actually help with weight loss?
Homemade detox drinks like lemon water, green tea, or apple cider vinegar may have minor metabolic benefits, but evidence for significant weight loss is weak. They work best as part of a calorie-controlled diet. For serious, clinically proven weight loss, prescription medications combined with dietary changes are more effective.
What's the difference between detox drinks and prescription weight loss treatment?
Detox drinks are supplements with limited evidence. Prescription medications like Mounjaro and Wegovy are licensed medicines with clinical trial data showing 15–21% average body weight loss. They work through hormonal mechanisms to reduce appetite and support sustainable weight management.
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 conditions. Check your BMI using our free calculator. Your GP can assess eligibility and refer you to NHS specialist services, or you can explore private prescribing through a UK-licensed prescriber.
How long does it take to see results with prescription weight loss medication?
Most people begin noticing changes within 4–8 weeks. Clinical trials tracked weight loss over 68–72 weeks. Results vary individually and work best alongside a reduced-calorie diet and increased physical activity. Consistency matters more than speed.
Can I combine detox drinks with prescription weight loss medication?
Generally yes, but always inform your prescriber about any supplements or drinks you consume regularly. Some may interact with medications or affect how well they work. Your GP or prescriber can advise on safe combinations during your clinical assessment.
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.