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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How to Get a Mounjaro Consultation in the UK
A Mounjaro consultation in the UK can happen through the NHS or privately, with significant differences in cost, waiting time, and accessibility. If you're considering tirzepatide for weight management, understanding your options—and what a consultation actually involves—is essential. This guide explains both routes, what to expect, and how to assess your eligibility before booking.
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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.
Private Mounjaro Consultations: Cost and Access
Private online consultations are the most accessible route for most UK adults. These typically cost £20 to £50 per consultation through registered online prescribing services. A qualified prescriber will review your medical history, current medications, and health conditions via a secure online platform—usually taking 15–30 minutes.
- Consultation fees are often waived if you proceed to a prescription
- Fast turnaround: prescriptions issued within 24–48 hours if approved
- Mounjaro costs vary by dose: approximately £130–£320 per month for private prescriptions, depending on your starting dose and titration schedule
- Each KwikPen contains four weekly doses (one month supply)
- No NHS referral needed—you can access private prescribing directly
The prescriber will assess your BMI, weight-related health conditions, and eligibility criteria before issuing a prescription. Use our free BMI calculator above to check your starting point before your 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.
NHS vs Private: Choosing Your Route
NHS access is free at point of use but involves significant waiting. You must be referred to a tier 3 specialist weight management service by your GP—waiting lists often extend months to years depending on your region. NHS approval typically requires a BMI of 30 or above, or 27–29.9 with weight-related conditions like type 2 diabetes or hypertension.
Private access is faster and doesn't require a GP referral, but you pay the full cost. Both routes require a clinical assessment confirming you meet eligibility criteria. Our GLP-1 weight loss calculator can help you project potential outcomes once you're approved. Your prescriber will also discuss the Mounjaro dose titration schedule—starting at 2.5 mg weekly, increasing every 4 weeks to a maximum of 15 mg.
- 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.
How much does a Mounjaro consultation cost in the UK?
Private online consultations typically cost £20–£50, though many providers waive this if you proceed to a prescription. NHS consultations are free, but access involves referral to specialist services with variable waiting times. Prescription costs then depend on your starting dose and titration plan.
Can I get a Mounjaro consultation without seeing my GP?
Yes, privately. You can book directly with a GPhC-registered online prescribing service without a GP referral. However, the prescriber will still need to review your full medical history and confirm you meet NHS eligibility criteria before issuing a prescription.
How long does a Mounjaro consultation take?
Private online consultations typically last 15–30 minutes. The prescriber reviews your medical history, current medications, weight, BMI, and eligibility. NHS consultations may take longer due to specialist assessment requirements, though waiting time for the appointment is often the main delay.
What happens after my Mounjaro consultation?
If approved, your prescriber issues a prescription to a GPhC-registered pharmacy. Your first KwikPen (containing four weekly doses) is dispensed. You'll receive guidance on injection technique, storage, and how to escalate your dose. Follow-up consultations may be offered after 4–6 weeks.
Does tirzepatide (Mounjaro) cost more than Wegovy?
Costs are broadly similar—both range from £130–£320 per month privately, depending on dose. Mounjaro uses a dual GIP/GLP-1 mechanism versus Wegovy's single GLP-1 mechanism. Clinical trials suggest comparable average weight loss (15–21% vs ~15%), but individual results vary significantly.
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.