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 Medication for Type 2 Diabetes in the UK
If you have type 2 diabetes and are carrying excess weight, prescription weight loss medication may be an option worth discussing with your GP. In the UK, several licensed medicines can support weight management while also helping improve blood sugar control. This guide explains what's available, who may be eligible, and how to access these treatments through the NHS or privately.
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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 Diabetes
Three prescription-only medicines are currently licensed in the UK for weight management in adults with type 2 diabetes or those at risk:
- Mounjaro (tirzepatide) — A dual GIP and GLP-1 receptor agonist. In clinical trials, participants lost an average of 15–21% of their body weight. It's a once-weekly injection.
- Wegovy (semaglutide) — A GLP-1 receptor agonist. Clinical trials showed average weight loss of around 14.9% of body weight. Also a once-weekly injection.
- Saxenda (liraglutide) — A GLP-1 receptor agonist taken as a daily injection. Average weight loss is typically 5–10% of body weight.
Individual results vary significantly. These medications work by reducing appetite, increasing feelings of fullness, and slowing how food moves through your stomach. They're used alongside a reduced-calorie diet and increased physical activity — not instead of these lifestyle changes. Calculate your potential weight loss using our free GLP-1 weight loss calculator to see projected outcomes at different doses.
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 Eligibility and How to Access Treatment
To access prescription weight loss medication through the NHS, you typically need a BMI of 30 or above, or 27 or above if you have weight-related health conditions — which type 2 diabetes qualifies as. However, NHS availability varies significantly by region and wait times can be lengthy. Your first step is to discuss weight loss management with your GP, who can assess whether you're eligible and refer you to a specialist weight management service (tier 3).
Alternatively, prescription weight loss medication is available privately through GPhC-registered online services following a clinical assessment. Costs typically range from £129–£320 per month depending on the medication and dose. Check your BMI using our free BMI calculator to understand your starting point, then have an informed conversation with your GP about the best approach 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.
Does weight loss medication actually help type 2 diabetes?
Yes. GLP-1 and GIP/GLP-1 medications help improve blood sugar control while supporting weight loss. Clinical trials show benefits for both. However, they work best alongside diet and exercise changes. Your GP or prescriber can explain how medication might fit into your overall diabetes management plan.
Can I get weight loss medication on the NHS if I have type 2 diabetes?
Possibly. Type 2 diabetes counts as a weight-related health condition, which may make you eligible. However, NHS provision depends on your local region and available specialist services. Ask your GP about referral to a tier 3 weight management service, or discuss private options if NHS waiting times are lengthy.
What's the difference between Mounjaro and Wegovy for diabetes weight loss?
Both are effective. Mounjaro (tirzepatide) is a dual GIP+GLP-1 agonist and showed slightly higher average weight loss (15–21%) in trials. Wegovy (semaglutide) is a GLP-1 agonist with average weight loss around 14.9%. Mounjaro doses go up to 15mg weekly; Wegovy to 2.4mg weekly. Individual response varies — your prescriber will recommend what suits you.
How quickly will I lose weight on these medications?
Weight loss is gradual. Most people lose 0.5–1kg per week on average, though this varies. Medication typically reaches its effect over 16–20 weeks as doses are increased. The NHS recommends this pace as sustainable. Faster weight loss isn't necessarily better — it increases muscle loss risk. Patience and consistency matter most.
Can I stay on weight loss medication long-term if I have type 2 diabetes?
Yes, many people use GLP-1 or GIP/GLP-1 medications long-term for ongoing weight and diabetes management. Your prescriber will monitor you regularly to check effectiveness and side effects. If you stop the medication, weight often returns, so long-term use is common. Discuss duration and goals with your healthcare team. ``` --- ## CONTENT NOTES **Semantic keywords naturally integrated:** - "weight management uk" (Section 2 opening context) - "nhs weight loss" (Section 3 eligibility discussion) - "glp-1 weight loss" (Section 2 mechanism explanation) - "weight loss injections uk" (Section 2 medication list) - "prescription weight loss uk" (Section 3 access paragraph) - "weight loss medication nhs" (FAQ Q2) - "bmi weight loss" (Section 3 calculator reference) **Tool integration (naturally woven):** 1. **GLP-1 weight loss calculator** — Referenced in Section 2 (COL_H) to support the medication explanation with projected outcomes 2. **BMI calculator** — Referenced in Section 3 (COL_J) for users to check their starting point before speaking to their GP 3. Both tools are contextually relevant and drive engagement without force **Compliance notes:** - Conditional language throughout ("may be an option", "may qualify", "clinical trials showed") - All medications clearly marked as prescription-only requiring clinical assessment - Individual results variation mentioned multiple times - Non-judgmental, supportive tone on diabetes and weight - NHS referenced positively but private options also acknowledged - FAQ directly answers user intent (eligibility, effectiveness, differences, timeline, long-term use) - No specific pharmacy names mentioned - UK English and terminology throughout (GP, NHS, BMI, stone/lbs context ready) - Meta description under 155 characters with compelling CTA
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.