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 Surgery and Prescription Medication Options in Manchester
Weight loss surgery isn't the only option for managing excess weight in Manchester. Many adults are now exploring prescription weight management medications as an alternative to surgical intervention. The NHS offers tiered weight management services across Greater Manchester, including specialist options for eligible adults. Understanding what's available — from lifestyle support to prescription medication — helps you make informed decisions about your weight management journey.
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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 Prescription Weight Loss Options
Three prescription weight management medications are currently licensed in the UK and may be available in Manchester depending on your eligibility and whether you access NHS or private services.
- Mounjaro (tirzepatide) — a once-weekly injection that activates dual GIP and GLP-1 pathways. Clinical trials showed participants lost an average of 15–21% of their body weight alongside diet and exercise changes.
- Wegovy (semaglutide) — a once-weekly GLP-1 injection. Evidence from clinical trials demonstrated average weight loss of approximately 15% body weight over 68 weeks.
- Saxenda (liraglutide) — a daily injection option, also GLP-1-based, offering a different administration schedule.
All three are prescription-only and require clinical assessment before being prescribed. Individual results vary significantly. These medications work best alongside reduced-calorie diet and increased physical activity, not as standalone 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 Access vs Private Weight Loss Routes in Manchester
NHS weight management services in Greater Manchester are structured in tiers. Tier 1 includes self-help digital tools and community programmes. Tier 2 involves primary care-based behaviour change support. Tier 3 is specialist multidisciplinary weight management services — where prescription weight loss medication may be offered. Tier 4 covers bariatric surgery for severe obesity with significant health complications.
Private access in Manchester is available through GPhC-registered online prescribing services following an online clinical assessment with a UK-licensed prescriber. This route doesn't require NHS referral and is typically faster, though costs apply. Your GP can advise on NHS eligibility and local waiting times. Using our free BMI calculator above helps you understand where your current weight sits before discussing options with a healthcare professional.
- 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.
What's the difference between weight loss surgery and prescription medication?
Surgery (like gastric bypass) is invasive and permanent, with recovery time and surgical risks. Prescription weight loss injections are non-surgical, reversible, and work by regulating appetite hormones. Surgery is typically reserved for severe obesity; medications are first-line for most adults. Both work best alongside lifestyle changes.
Am I eligible for prescription weight loss medication on the NHS in Manchester?
NHS eligibility generally requires BMI of 30 or above, or BMI 27–29.9 with weight-related health conditions (diabetes, high blood pressure, sleep apnoea, cardiovascular disease). For South Asian, Chinese, Black African, or Black Caribbean adults, lower BMI thresholds apply. Your GP can assess your eligibility and refer you to Manchester's tier 3 specialist weight management service.
How much does prescription weight loss medication cost privately in the UK?
Private costs typically range from £129–£320 per month depending on the medication, dose, and provider. This varies across Manchester pharmacies. NHS prescription costs are £11.90 per item (or free if exempt). Private access is faster but involves ongoing monthly costs, whereas NHS access is free but may have longer waiting times.
Can I use our weight loss calculator to estimate results with Mounjaro or Wegovy?
Yes — our free GLP-1 weight loss calculator above helps you project potential weight loss at different doses based on clinical trial data. It shows average outcomes, but individual results vary. Always discuss realistic expectations with your prescriber, as weight loss depends on medication dose, adherence, diet, exercise, and personal factors.
Where do I start if I want to explore weight loss options in Manchester?
Start by speaking with your GP, who can assess your health, discuss options, and refer you to NHS tier 3 services if appropriate. If you prefer private access, you can contact a GPhC-registered online prescribing service directly. Calculate your BMI using our free tool on this page to help frame the conversation with your healthcare provider.
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.