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 Injections in Belfast — What You Need to Know
If you're looking for weight loss injections in Belfast, you have options through both NHS specialist services and private prescription routes. Prescription weight loss medications like Mounjaro and Wegovy are licensed in the UK and available to adults meeting specific eligibility criteria. This guide explains which medications are available, how to check if you're eligible, and the different ways to access them. Whether you're in Belfast, Northern Ireland or elsewhere in the UK, understanding your weight management options is an important first step. Use our free BMI calculator above to check your starting point.
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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 Injection Options
Three prescription-only weight loss injections are currently licensed in the UK for weight management in eligible adults:
- Mounjaro (tirzepatide) — a dual GIP and GLP-1 receptor agonist, given as a once-weekly injection. Clinical trials showed participants lost an average of 15–21% of their body weight alongside a reduced-calorie diet and increased physical activity.
- Wegovy (semaglutide) — a GLP-1 receptor agonist, also given once weekly. Evidence suggests average weight loss of around 15% at the maximum dose.
- Saxenda (liraglutide) — a GLP-1 receptor agonist given as a once-daily injection. This was the first GLP-1 injection licensed for weight management in the UK.
All three are prescription-only medicines and require a clinical assessment before being prescribed. Individual results vary, and these medications work best when combined with lifestyle changes including reduced-calorie eating and increased physical activity. Try our GLP-1 weight loss calculator to estimate potential results at different dose levels.
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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.
NHS Access vs Private Prescription in Northern Ireland
In Northern Ireland, weight loss injections are available through two main routes:
- NHS route: Referral to a specialist weight management service (Tier 3) from your GP. Access varies by Health and Social Care Trust and waiting times can be substantial. Your GP can advise on local availability and waiting lists.
- Private route: Online consultation with a UK-licensed prescriber, followed by prescription dispensing through a GPhC-registered pharmacy. This route does not require an NHS referral and is often faster, though costs vary by dose and provider.
Eligibility for both routes requires a BMI of 30 or above, or 27 or above if you have weight-related health conditions such as type 2 diabetes, high blood pressure, or cardiovascular disease. Track your progress with our free progress tracker once you begin any weight management programme.
- 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.
Am I eligible for weight loss injections in Belfast?
You may be eligible if you have a BMI of 30 or above, or 27 or above with weight-related health conditions. These include type 2 diabetes, prediabetes, high blood pressure, abnormal cholesterol, or sleep apnoea. Your GP can assess your individual circumstances. Use our free BMI calculator to check your starting BMI.
How long does it take to get weight loss injections on the NHS in Northern Ireland?
NHS waiting times vary significantly by Health and Social Care Trust. Some areas have waiting lists of several months or longer. Contacting your GP is the first step to understand current waiting times in your area.
What's the difference between Mounjaro and Wegovy?
Mounjaro (tirzepatide) is a dual GIP and GLP-1 agonist, while Wegovy (semaglutide) is a GLP-1-only agonist. Both are once-weekly injections. Mounjaro has shown slightly higher average weight loss in clinical trials, but individual results vary significantly. Your prescriber can advise which is more suitable for you.
Can I get weight loss injections privately in Belfast without an NHS referral?
Yes. Private prescribers can issue prescriptions if a clinical assessment supports eligibility. This route does not require NHS referral but does require consultation with a UK-licensed prescriber and costs are typically met privately.
Do weight loss injections work on their own?
No. Weight loss injections are most effective when combined with a reduced-calorie diet and increased physical activity. Clinical trials showed results were achieved alongside lifestyle changes, not medication alone. Your GP or prescriber will discuss realistic expectations.
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.