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
Injectables for Type 2 Diabetes in the UK
Injectable medications are an important option for managing type 2 diabetes in the UK. These prescription-only injectables work by helping your body regulate blood sugar levels more effectively. Some GLP-1 injectables also support weight management, which can be particularly beneficial since weight and blood sugar control are closely linked. This NHS health guide explains how these medications work, who can access them, and what to expect from treatment in the UK healthcare system.
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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.
How Type 2 Diabetes Injectables Work
Several types of injectable medications are available for type 2 diabetes management in the UK. GLP-1 receptor agonists are among the most commonly prescribed. These medications mimic a natural gut hormone that helps control blood sugar levels after eating, stimulates insulin release, and slows how quickly food leaves your stomach.
- GLP-1 injectables licensed in the UK: Saxenda (liraglutide — daily injection), Trulicity (dulaglutide — weekly injection), Ozempic (semaglutide — weekly injection), and others
- How they work: They signal to your pancreas to release more insulin when blood sugar rises, and signal to your brain that you're satisfied after eating
- Added benefit: Many GLP-1 injectables also support modest weight loss, which improves blood sugar control further
Another class, SGLT2 inhibitors, work differently by helping your kidneys remove excess glucose through urine. Your GP will recommend the most suitable injectable based on your individual health needs.
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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.
Eligibility and NHS Access
Access to injectable type 2 diabetes medications through the NHS depends on your individual circumstances and current treatment. Typically, your GP will discuss injectables if other treatments (such as metformin or tablets) haven't achieved adequate blood sugar control, or if you have weight management needs alongside your diabetes.
Your GP can assess whether an injectable is right for you and arrange prescription through the NHS. Some injectables are also available privately following an online clinical assessment. Weight management is a key NHS health advice priority for type 2 diabetes, and our free BMI calculator can help you track whether your current weight is supporting your diabetes management goals.
- 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 injectable type 2 diabetes medications available on the NHS?
Yes, several injectable medications for type 2 diabetes are available on the NHS, including GLP-1 receptor agonists and SGLT2 inhibitors. Your GP will assess your individual situation and may recommend an injectable if tablets haven't controlled your blood sugar adequately. Availability and eligibility vary by region, so discuss with your GP.
Can GLP-1 injectables for diabetes also help with weight loss?
Many GLP-1 injectables do support weight loss as a secondary benefit. This is particularly useful since weight and blood sugar control are linked. If weight management is a priority alongside diabetes treatment, your GP can discuss GLP-1 options that provide both benefits.
What's the difference between Ozempic and weight loss injectables like Wegovy?
Both contain semaglutide but serve different purposes. Ozempic is licensed for type 2 diabetes management (approved doses up to 2 mg). Wegovy is licensed specifically for weight management in eligible adults (doses up to 2.4 mg). Your GP will recommend the appropriate medication for your health needs.
How often do I need to inject these medications?
This depends on the specific injectable. Some are daily injections (like Saxenda), others are weekly (like Ozempic, Trulicity, or Wegovy). Your GP or nurse will show you how to inject at home and discuss which schedule suits your lifestyle best.
Are there side effects I should know about?
Like all medications, injectables can have side effects. Common ones include nausea, diarrhoea, and constipation, which often improve with time. Serious side effects are rare but can include pancreatitis or gallbladder issues. Always discuss potential side effects with your GP and report any concerning symptoms promptly.
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.