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 Bike Workout — UK Medication Options
Cycling is an excellent cardiovascular exercise that supports weight management and fitness. However, for many UK adults looking to lose weight, combining regular cycling with prescription medication under medical supervision can be more effective than exercise alone. This guide explores weight loss medication options available in the UK and how they work alongside your fitness routine, whether that's a regular bike workout or other activity. Start by understanding your current health status using our free BMI calculator above.
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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 — Eligibility and Options
Several prescription weight loss medications are licensed in the UK for eligible adults. The most commonly prescribed options for weight management are Mounjaro (tirzepatide), a once-weekly injection that activates dual GIP and GLP-1 hormone pathways, and Wegovy (semaglutide), which targets the GLP-1 pathway alone. A third option, Saxenda (liraglutide), is a daily injection also approved for weight loss. Eligibility typically requires a BMI of 30 or above, or 27 or above alongside a weight-related health condition such as type 2 diabetes, high blood pressure, or sleep apnoea. Clinical trials showed that alongside reduced-calorie diet and regular activity like cycling, these medications help participants lose an average of 15–21% of their body weight—though individual results vary significantly. Our GLP-1 weight loss calculator can help you estimate potential weight loss outcomes at different medication doses. South Asian, Chinese, Black African, and Black Caribbean adults may qualify at lower BMI thresholds, as NHS guidance recognises higher health risks at lower weights for these groups.
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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 vs Private Access — How to Find Out If You're Eligible
In the UK, prescription weight loss medication is available through two pathways. The NHS route involves referral to a specialist tier 3 or tier 4 weight management service from your GP—though waiting times can be significant and availability varies by region (Integrated Care Board). The private route involves online consultation with a UK-licensed prescriber through a GPhC-registered pharmacy, typically costing £129–£320 per month depending on dose. Both pathways require clinical assessment to confirm eligibility and suitability. Your GP can advise on NHS options in your area, or you can explore private prescribing independently. Whichever route you choose, weight loss medication works most effectively alongside sustainable lifestyle changes: regular activity like cycling, balanced nutrition, and gradual behavioural shifts. Using our free progress tracker can help you log both your weight loss journey and exercise consistency over time.
- 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.
Will a bike workout alone help me lose weight?
Cycling is excellent for cardiovascular health and burns calories, supporting weight loss when combined with a calorie deficit. However, for many people, exercise alone may not achieve significant weight loss without dietary changes. Prescription weight loss medication combined with cycling and healthy eating often produces more substantial and sustained results than any single approach.
Am I eligible for prescription weight loss medication in the UK?
You may be eligible if you have a BMI of 30 or above, or 27 or above with a weight-related condition like type 2 diabetes, hypertension, or sleep apnoea. Your GP or a licensed prescriber can assess your individual eligibility following a clinical consultation. South Asian and other specific ethnic groups may qualify at lower BMI thresholds.
How quickly can I expect weight loss with medication and exercise?
Weight loss medications typically begin showing results within 4–8 weeks, with continued loss over 16–20 weeks. The NHS recommends a safe weight loss rate of 0.5–1 kg per week. Combined with regular cycling and a reduced-calorie diet, this pace is both sustainable and effective for long-term health.
Can I use Mounjaro or Wegovy while exercising regularly?
Yes. In fact, prescription weight loss medications work best alongside physical activity and dietary changes. Many people find that these medications, combined with regular exercise like cycling, support more consistent and significant weight loss than either approach alone. Always discuss your exercise routine with your prescriber.
What's the difference between Mounjaro and Wegovy for weight loss?
Mounjaro (tirzepatide) is a dual GIP and GLP-1 agonist, while Wegovy (semaglutide) is a GLP-1 agonist alone. Clinical trials showed Mounjaro may support slightly higher average weight loss (15–21% vs 14–15%), but individual results vary. Both are once-weekly injections. Your prescriber will recommend the most suitable option for your circumstances.
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.