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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Restless Legs and Mounjaro — What You Need to Know
Restless legs syndrome (RLS) is a neurological condition causing an irresistible urge to move the legs, often affecting sleep. If you're considering Mounjaro (tirzepatide) for weight management in the UK, it's important to understand how this GLP-1 and GIP receptor agonist injection may interact with RLS symptoms. This guide covers NHS eligibility, UK prescribing context, potential side effects, and what to discuss with your GP before starting treatment. Mounjaro is a prescription-only medicine available through NHS specialist services or private prescribing pathways.
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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.
NHS Mounjaro Eligibility and RLS Considerations
NHS eligibility for Mounjaro in the UK requires a BMI of 30 kg/m² or above, or 27–29.9 kg/m² with weight-related health conditions (type 2 diabetes, hypertension, sleep apnoea, cardiovascular disease). Access is through NHS tier 3 specialist weight management services, though availability varies significantly by region. For South Asian, Chinese, Black African, or Black Caribbean adults, lower thresholds (BMI 27.5+) may apply due to higher health risks at lower weights.
If you have restless legs syndrome, this is not a contraindication to Mounjaro, but it's essential your GP or prescriber knows your RLS diagnosis and any medications you take for it. Some Mounjaro side effects—such as nausea, constipation, or altered appetite—may indirectly affect RLS symptoms or sleep quality. Your prescriber can assess whether Mounjaro is appropriate for your individual situation.
Use our free BMI calculator above to check your personal BMI and eligibility range instantly.
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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.
Managing Restless Legs While Taking Mounjaro
If you already have restless legs syndrome and are prescribed Mounjaro, communicate openly with your healthcare team about any changes in symptoms. RLS symptoms can worsen with poor sleep, stress, or certain medications—Mounjaro's common side effects (nausea, constipation) may indirectly impact sleep quality.
There is no direct evidence that Mounjaro itself causes or worsens RLS, but individual responses vary. If you notice your RLS symptoms change after starting Mounjaro, contact your GP promptly. They can adjust your RLS treatment if needed or assess whether Mounjaro dose adjustments are appropriate. Always take Mounjaro as prescribed via KwikPen once weekly, and keep your healthcare provider informed of all symptoms.
Try our free progress tracker to log any symptom changes alongside your weight management journey.
- 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.
Can I take Mounjaro if I have restless legs syndrome?
Yes, restless legs syndrome is not a contraindication to Mounjaro. However, inform your GP or prescriber of your RLS diagnosis and any RLS medications you take. Your prescriber will assess whether Mounjaro is suitable for you individually. Always discuss any neurological conditions before starting treatment.
Could Mounjaro make my restless legs worse?
There is no direct evidence that Mounjaro causes or worsens RLS. However, Mounjaro's common side effects (nausea, constipation, sleep disruption) may indirectly affect sleep quality, which can worsen RLS symptoms in some people. Individual responses vary, so monitor your symptoms carefully.
What should I do if my restless legs symptoms change after starting Mounjaro?
Contact your GP immediately if you notice changes in RLS symptoms after beginning Mounjaro. Your doctor can assess whether the changes are related to Mounjaro, adjust your RLS treatment, or modify your Mounjaro dose if needed. Keep a symptom log using our free progress tracker.
Is Mounjaro available on the NHS for weight management if I have restless legs?
Yes, if you meet NHS eligibility criteria (BMI 30+ or 27–29.9 with comorbidities), you can access Mounjaro through NHS tier 3 specialist weight management services. RLS does not automatically exclude you, but your prescriber will consider your full medical history.
How does Mounjaro differ from other weight loss injections like Wegovy?
Mounjaro (tirzepatide) is a dual GIP and GLP-1 receptor agonist, whereas Wegovy (semaglutide) is a GLP-1-only agonist. Both are once-weekly injections licensed in the UK. Clinical trials suggest Mounjaro may produce slightly higher average weight loss (~20% vs ~15%), but individual results vary significantly and both require prescription and clinical assessment.
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.