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
Does Mounjaro Cause Hair Loss?
Hair loss is a known side effect reported by some people taking Mounjaro, though it is not experienced by everyone. Hair thinning or alopecia appears on the common side effects list (affecting up to 1 in 10 people) and is usually temporary, improving after the body adjusts to the medication. Understanding Mounjaro's side effects, plus the cost and access options available in the UK, can help you make an informed decision about whether this weekly weight loss injection is right for you. Our GLP-1 weight loss calculator can help estimate potential outcomes at different doses.
10,000+ calculations today · NHS-aligned thresholds · 100% free
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.
Mounjaro Hair Loss and UK Private Prescription Costs
Hair loss with Mounjaro: Hair thinning or alopecia is reported as a common side effect, occurring in some people during the first few weeks or months of treatment. It is usually temporary and linked to gradual weight management and changes in nutritional status, rather than the medication itself.
Private prescription costs in the UK: A weekly weight loss injection through private online prescribing typically costs between £129 and £320 per month, depending on your dose. Starting doses (2.5–5 mg) are generally cheaper, while higher maintenance doses (10–15 mg) cost more. Prices vary between GPhC-registered pharmacies. Most private providers include an online clinical assessment with a UK-licensed prescriber before dispensing. You can access this mounjaro kwikpen prescription without an NHS referral, though you'll need to confirm you meet eligibility criteria (BMI 30+ or BMI 27+ with weight-related health conditions).
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: How to Get Mounjaro in the UK
NHS route: Mounjaro is available through specialist tier 3 weight management services following NICE approval, but access varies significantly by region and involves a GP referral. Waiting lists can be several months to over a year in many areas. Once approved, the NHS covers the cost.
Private route: Online consultations with UK-licensed prescribers are faster (results within days) and don't require NHS referral. You'll complete a medical questionnaire, have a brief assessment, and receive a prescription if appropriate. The GPhC-registered pharmacy then dispenses your mounjaro uk prescription. This route is best if you want rapid access or prefer to avoid NHS waiting lists. Use our BMI calculator to check your eligibility before consulting a prescriber.
- 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.
Is hair loss from Mounjaro permanent?
No, hair loss from Mounjaro is usually temporary and linked to gradual weight management and nutritional changes. Hair typically regrows once your body adjusts and weight loss plateaus. If hair loss persists beyond a few months, discuss it with your prescriber — nutritional support or dose adjustments may help.
How much does Mounjaro cost privately in the UK?
Private Mounjaro costs £129–£320 per month depending on your dose. Lower starting doses cost less; higher maintenance doses (10–15 mg) cost more. Prices vary between GPhC-registered pharmacies. This includes the online clinical assessment, KwikPen device, and delivery.
Can I get Mounjaro on the NHS in the UK?
Yes, Mounjaro is available through NHS specialist weight management services following NICE approval. However, access varies by region and involves a GP referral to tier 3 services. Waiting lists can be long. Private prescription weight loss uk options offer faster access without NHS referral.
What happens during a private online consultation for Mounjaro?
You complete a medical questionnaire about your health history, current medications, and weight-related conditions. A UK-licensed prescriber reviews this and may ask follow-up questions. If you meet eligibility criteria, a prescription is issued and dispensed by a GPhC-registered pharmacy within 1–3 working days.
Is Mounjaro cheaper than Wegovy in the UK?
Pricing is similar between Mounjaro and Wegovy at comparable doses (£129–£320/month), though exact costs vary by pharmacy and dose. Mounjaro may show greater average weight loss in clinical trials, but individual results vary. Compare costs directly with private prescribers and discuss which option suits your health needs.
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.