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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Mounjaro Reviews — UK Cost, Access & What to Expect
Mounjaro (tirzepatide) is a prescription-only weekly weight loss injection that's available in the UK through both NHS specialist services and private prescription routes. If you're considering this GLP-1 receptor agonist treatment, understanding the real costs, how to access it, and what the experience involves is essential. This guide covers UK-specific pricing, eligibility, and the practical steps to getting a prescription—based on current NHS guidance and private prescribing information.
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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.
Mounjaro Cost in the UK — NHS vs Private
NHS access: Mounjaro is approved by NICE for use within NHS specialist weight management services, but availability varies significantly by region. NHS access is typically free once referred to a tier 3 or tier 4 specialist service, but waiting lists can be lengthy—sometimes 6–12 months or longer depending on your integrated care board (ICB). Your GP can refer you, but they cannot prescribe it directly in primary care.
Private prescription costs: Through GPhC-registered online pharmacies, Mounjaro costs typically range from £129 to £320 per month, depending on the dose you're prescribed. A 2.5 mg KwikPen (starting dose, 4 weeks) costs around £129–£150. The 15 mg maintenance dose costs approximately £250–£320 monthly. These prices are for the medication only and do not include the online consultation fee, which usually ranges from £30 to £80 with a UK-licensed prescriber.
- Starting dose (2.5 mg): approximately £129–£150/month
- Maintenance doses (5–15 mg): approximately £180–£320/month
- Online consultation: typically £30–£80 (one-off or per consultation)
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.
How to Access Mounjaro in the UK — Your Options
NHS route: Ask your GP for a referral to your local specialist weight management service (tier 3). Eligibility requires a BMI of 30+ or 27+ with weight-related health conditions. Once referred, the NHS service will assess you for suitability. This route is free but involves waiting and stricter eligibility criteria.
Private route: Use an online consultation platform with a UK-licensed prescriber. You complete a health questionnaire, have a video or phone consultation, and if approved, receive a prescription sent to a participating pharmacy. This avoids NHS waiting lists but costs £100–£400+ per month (medication plus consultation). No NHS referral needed. Use our free GLP-1 weight loss calculator to estimate potential outcomes before committing.
What the private consultation involves: You'll be asked about your medical history, current medications, BMI, weight-related health conditions, and previous weight loss attempts. The prescriber will assess whether Mounjaro is safe for you—checking for contraindications like pancreatitis history, gallbladder problems, or pregnancy plans. If approved, your prescription goes directly to the pharmacy. You should expect the first dose within 5–7 working days. Ongoing prescriptions typically require check-in consultations every 4–8 weeks, often charged separately.
- 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 Mounjaro available on the NHS for weight loss?
Yes, but access is limited. NICE has approved tirzepatide for NHS specialist weight management services (tier 3/4). You need a GP referral, and availability varies by region—some areas have year-long waiting lists. Once approved, it's free, but eligibility criteria are strict (BMI 30+ or 27+ with comorbidities). Private prescription avoids waiting but costs £130–£320/month.
How much does Mounjaro cost privately in the UK?
Private Mounjaro costs £129–£320 per month depending on dose, plus a consultation fee (£30–£80). A starter 2.5 mg KwikPen costs around £130, while higher maintenance doses (10–15 mg) cost £250–£320. Total monthly cost including occasional consultations is typically £150–£400. Prices vary between GPhC-registered pharmacies.
Can I get Mounjaro without an NHS referral?
Yes, through private prescription. You don't need an NHS referral—just an online consultation with a UK-licensed prescriber. If clinically appropriate, they issue a prescription to a participating GPhC-registered pharmacy. This bypasses NHS waiting lists entirely but you pay privately for medication and consultations.
What happens during a Mounjaro online consultation?
The prescriber asks about your health history, current medications, weight, BMI, and any weight-related conditions. They'll check for contraindications (pancreatitis, gallbladder disease, pregnancy plans, certain medications). If approved, your prescription is sent to the pharmacy within 24 hours. The dose is tailored to you—typically starting at 2.5 mg and increasing gradually every 4 weeks. Follow-up consultations monitor your progress.
Are there hidden costs with private Mounjaro prescriptions?
Aside from the medication and initial consultation, expect repeat consultation fees every 4–8 weeks (£20–£50 each) to monitor your progress. Shipping is usually included or costs £5–£10. Some providers bundle consultations into packages, while others charge per-visit. Always ask about the full cost before starting—medication alone doesn't cover ongoing prescriber support and dose adjustments.
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.