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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Tirzepatide Reviews: UK Cost and Access
Tirzepatide (brand name Mounjaro) is a weekly weight loss injection available in the UK through both NHS specialist services and private prescription routes. This guide covers real tirzepatide reviews, transparent pricing, how much it costs, and what to expect from the UK prescription process. Whether you're considering NHS access or private treatment, understanding the costs and eligibility criteria upfront helps you make an informed decision about this GLP-1 receptor agonist medication for weight management.
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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.
UK Private Tirzepatide Costs and Prescription Access
Private tirzepatide costs in the UK vary depending on the dose and provider, typically ranging from £129 to £320 per month. Lower doses (2.5 mg to 5 mg) generally cost less, whilst higher maintenance doses (10 mg to 15 mg) are more expensive. Costs usually include the prescription fee, medication, and delivery to your home.
Access through private routes involves an online consultation with a UK-licensed prescriber who will assess your eligibility based on your BMI, weight, and health history. Use our free BMI calculator to check your current BMI before your consultation — prescribers typically require a BMI of 30 or above, or 27 or above with weight-related health conditions.
- Prescriptions are dispensed by GPhC-registered pharmacies only
- Payment is usually per month or per pen (4 weeks supply per pen)
- Insurance does not typically cover private tirzepatide prescriptions
- You can request dose adjustments during follow-up consultations
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: How to Access Tirzepatide in the UK
NHS access is free at point of use but involves referral to a tier 3 specialist weight management service — most GPs cannot prescribe tirzepatide directly. Waiting lists vary by region and can take months to years. NICE has approved tirzepatide for NHS use, but regional availability depends on individual Integrated Care Boards (ICBs).
Private access is faster — typically within days of your online assessment — but you pay the full cost. You do not need an NHS referral. An online consultation with a licensed prescriber takes 10–20 minutes, usually involving health questions, BMI review, and medication history. If approved, your prescription is sent to a UK pharmacy for dispensing. This weekly weight loss injection approach gives you flexibility without NHS waiting lists.
Try our free GLP-1 weight loss calculator to estimate potential tirzepatide results at different doses — this can help you understand expected outcomes before consulting a prescriber. Real tirzepatide reviews from users consistently mention that combining the injection with a reduced-calorie diet and increased physical activity produces the best results. Track your weight loss journey using our free progress tracker once you begin treatment, and always discuss any side effects or dose concerns with your 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.
What does tirzepatide cost on the NHS?
Tirzepatide is free through the NHS if you are eligible and referred to a tier 3 specialist weight management service. However, NHS access is limited by regional availability and waiting lists can be very long — sometimes 12+ months depending on your area.
Is tirzepatide cheaper than Wegovy in the UK?
Tirzepatide and Wegovy have similar private costs, typically £129–£320 per month depending on dose. Tirzepatide (Mounjaro) uses a dual GIP and GLP-1 mechanism, whilst Wegovy (semaglutide) is a GLP-1 receptor agonist only. Pricing varies by provider, not by medication type.
How long does a tirzepatide prescription take online?
Private online consultations typically take 10–20 minutes. If approved, your prescription can be sent to a pharmacy the same day, with delivery within 2–5 working days. NHS referral to specialist services usually takes weeks to months before initial assessment.
Do I need a GP referral for private tirzepatide?
No. Private tirzepatide prescriptions do not require an NHS GP referral. You can book an online consultation directly with a private prescriber. However, informing your GP is recommended for medical record purposes.
Can I switch from Wegovy to tirzepatide?
Yes, but this requires prescriber guidance. Approximate dose equivalence exists — for example, Wegovy 2.4 mg is roughly equivalent to tirzepatide 10 mg — but any switch should be managed by your prescriber to ensure continuity of care and appropriate dosing.
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.