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 for Kidney Disease: UK Medication Options
Weight loss with kidney disease requires specialist medical guidance, as standard weight management approaches may not be suitable. If you have chronic kidney disease (CKD) and are carrying excess weight, your GP or renal team can assess whether prescription weight loss medication might help alongside careful dietary and lifestyle management. This guide covers UK-licensed options and how to discuss eligibility with your healthcare provider.
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 Weight Loss Medications and Kidney Disease Considerations
Three prescription weight loss medications are currently licensed in the UK: Mounjaro (tirzepatide), a GIP and GLP-1 receptor agonist; Wegovy (semaglutide), a GLP-1 agonist; and Saxenda (liraglutide), a daily GLP-1 injection. Eligibility for standard weight loss medication typically requires a BMI of 30 kg/m² or above, or 27–29.9 with weight-related health conditions.
However, kidney disease changes how medications are processed in your body. GLP-1 medications are generally suitable for people with early-stage CKD, but suitability depends on your kidney function level, other medications, and overall health. Your renal consultant or GP must assess whether prescription weight loss medication is appropriate for you, as they can adjust dosing or recommend alternatives if needed. Individual results vary, and weight loss medication works alongside dietary adjustments and increased physical activity, not instead of them.
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.
Finding Specialist Assessment Through the NHS and Private Prescribing
If you have kidney disease and want to explore weight loss medication, discuss this with your GP or renal team first. NHS access is through specialist tier 3 weight management services, usually by GP referral. Availability varies significantly by region, and waiting times can be lengthy in many areas. Private prescribing is available through UK-registered online services following a clinical consultation, often faster than NHS routes.
Your healthcare team will review your kidney function (eGFR and creatinine levels), current medications, and blood pressure before deciding whether prescription weight loss medication is safe for you. Calculate your personal BMI using our free BMI calculator to help inform your conversation with your GP about eligibility and next steps.
- 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.
Can I take Mounjaro or Wegovy if I have kidney disease?
GLP-1 medications like Wegovy and tirzepatide-based medications like Mounjaro can be used in early-stage kidney disease (CKD stages 1–2), but your renal team must assess your individual kidney function, other medications, and overall health first. More advanced CKD may require different approaches or specialist dosing. Always discuss with your GP or renal consultant before starting any new medication.
Does weight loss help with kidney disease?
Yes, losing even 5–10% of body weight can reduce blood pressure, improve blood sugar control, and potentially slow kidney disease progression. However, weight loss with CKD must be medically supervised to ensure you're not losing muscle mass or affecting kidney function. Work with your renal team to find a safe, sustainable approach.
What dietary changes should I make alongside weight loss medication if I have CKD?
Dietary management in kidney disease is complex and depends on your stage of CKD. You may need to limit sodium, phosphorus, potassium, or protein. A renal dietitian can create a personalised plan that works with any weight loss medication. Your GP can refer you to specialist dietetics services through the NHS.
How do I know if I'm eligible for prescription weight loss treatment with kidney disease?
Eligibility is assessed individually by your GP or renal team, considering your BMI, kidney function level, blood pressure, other medications, and overall health. Standard BMI thresholds are 30 kg/m² or above, or 27–29.9 with weight-related conditions, but kidney disease may change eligibility criteria. Schedule a conversation with your healthcare provider to discuss your options.
Can I use the BMI calculator and weight converter on MyWeightCheck to help plan my weight loss with kidney disease?
Yes. Use our free BMI calculator to determine your current BMI category, and the weight converter to track weight changes in stone and kg. Our free progress tracker can also help you log weight loss over time. However, always work with your renal team to set safe targets specific to your kidney function and health goals.
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.