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 and Atorvastatin: What You Need to Know
Atorvastatin is a statin medication prescribed to lower cholesterol and reduce heart disease risk. Some people taking atorvastatin experience modest weight changes, though the medication itself is not a weight loss treatment. If you're concerned about weight management alongside cholesterol control, UK prescription weight management options are available for eligible adults. These include licensed GLP-1 injections and dual GIP/GLP-1 medications, which work through different mechanisms to support weight loss when combined with lifestyle changes. This guide explains what's available and how to find out if you qualify.
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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.
Prescription Weight Loss Options Available in the UK
If you're managing cholesterol with atorvastatin and also seeking weight management UK support, several prescription options are available for eligible adults:
- Mounjaro (tirzepatide) — a dual GIP and GLP-1 receptor agonist given once weekly. Clinical trials showed participants lost an average of 15–21% of their body weight over 72 weeks, though individual results vary.
- Wegovy (semaglutide) — a GLP-1 receptor agonist given once weekly. Evidence from clinical trials indicates average weight loss of around 15% of body weight.
- Saxenda (liraglutide) — a GLP-1 receptor agonist given as a daily injection, with similar weight loss outcomes to Wegovy.
All three are prescription weight loss medication options in the UK and must be prescribed following a clinical assessment. Your GP or a licensed prescriber will assess whether you're eligible based on your BMI, health status, and any weight-related health conditions. Use our free BMI calculator above to check your current BMI and understand where you stand relative to NHS eligibility thresholds.
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 vs Private Access and Finding Out If You're Eligible
NHS access: Weight loss medications are prescribed through specialist tier 3/tier 4 weight management services. You'll need a GP referral and may face waiting lists, though availability varies significantly by region. Private access: Available through GPhC-registered online prescribers following an online clinical assessment — no NHS referral needed, though costs apply.
To find out if you're eligible, speak to your GP. You may qualify if your BMI is 30 or above, or 27–29.9 with weight-related health conditions such as type 2 diabetes, high blood pressure, or sleep apnoea. Our GLP-1 weight loss calculator can help you estimate potential outcomes if you're considering prescription medication. Remember that weight loss medications work best alongside reduced-calorie diet and increased physical activity — they're a tool to support, not replace, lifestyle changes.
- 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 atorvastatin cause weight gain or weight loss?
Atorvastatin itself is not typically associated with significant weight change in most people. Some individuals may experience modest weight fluctuations, but the medication is not a weight loss or weight gain treatment. If you're concerned about weight changes while taking atorvastatin, discuss this with your GP.
Can I take weight loss medication like Mounjaro or Wegovy while taking atorvastatin?
Potentially, yes — but it requires careful prescriber assessment. GLP-1 medications may interact with certain other drugs or affect medication absorption. Always inform your prescriber of all medications you're taking, including atorvastatin, before starting any weight loss treatment.
What BMI do I need to qualify for prescription weight loss medication in the UK?
You may be eligible if your BMI is 30 or above, or 27–29.9 kg/m² if you have at least one weight-related health condition (such as high cholesterol, high blood pressure, type 2 diabetes, or sleep apnoea). Use our free BMI calculator to check your current BMI.
How do I access weight loss medication through the NHS?
Ask your GP for a referral to your local tier 3 or tier 4 specialist weight management service. They'll assess your eligibility and, if appropriate, may prescribe weight loss medication. Availability and waiting times vary by region.
What's the difference between Mounjaro and Wegovy for weight loss?
Mounjaro (tirzepatide) is a dual GIP/GLP-1 agonist; Wegovy (semaglutide) is a GLP-1 agonist only. Both are once-weekly injections. Clinical trials suggest Mounjaro may produce slightly greater average weight loss, though individual results vary significantly. Your prescriber will recommend what's most appropriate for you.
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.