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 First Order Discount: UK Cost and Access Guide
If you're considering Mounjaro (tirzepatide) for weight management in the UK, understanding the true cost and how to access it is essential. Unlike some medications, Mounjaro first orders don't typically come with retailer discounts — the actual price depends on whether you access it through the NHS or privately. This guide explains what to expect, how to get started, and what affects the cost of your initial prescription.
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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.
What Mounjaro Costs in the UK: Private Route
Private prescription costs for Mounjaro typically range from £129 to £320+ per month, depending on your starting dose and the provider. The first order usually costs the same as ongoing prescriptions — there's no special "first order discount" in the traditional sense, though some providers may offer loyalty schemes or package pricing for multiple months upfront.
Your first Mounjaro KwikPen contains 4 doses (a 4-week supply). Starting dose is typically 2.5 mg, which may cost less than higher maintenance doses (5 mg, 10 mg, or 15 mg). To access private prescription Mounjaro, you'll need an online clinical assessment with a UK-licensed prescriber. This assessment (usually £15–£50) determines if tirzepatide is suitable for you. If approved, your prescription is dispensed by a GPhC-registered pharmacy. Use our free GLP-1 weight loss calculator above to estimate potential results at different doses, which may help you discuss options with a prescriber.
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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.
NHS Access vs Private Route: Which Costs Less?
NHS access is theoretically free at the point of use (standard prescription charge applies in England — currently £11.90 per item), but availability is extremely limited. Mounjaro is only prescribed through specialist tier 3/4 weight management services, and access varies significantly by region and ICB funding. Waiting lists in many areas are 12+ months. Private access is faster (weeks, not years) but costs £129–£320+/month depending on dose. If cost is a barrier, discuss NHS referral options with your GP, but be prepared for lengthy waits. Your GP can also advise on whether you meet NHS eligibility criteria (BMI ≥30, or BMI ≥27 with weight-related health conditions). Check your eligibility using our free BMI calculator on this page.
Eligibility for both routes is similar: BMI of 30 or above, or 27–29.9 with weight-related conditions like type 2 diabetes, hypertension, or sleep apnoea. For South Asian, Black African, Black Caribbean, or Chinese adults, lower thresholds apply (BMI ≥27.5). What's not included in the cost: initial consultations with some providers, blood tests if required, and any follow-up monitoring. Some private providers bundle these; others charge separately. Always clarify what's included before starting. Mounjaro dose titration typically takes 16+ weeks to reach maximum dose, so your first order is rarely your final dose — budget for ongoing treatment costs when comparing routes.
- 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 there a first order discount code for Mounjaro in the UK?
No official discount codes exist for Mounjaro in the UK. Private providers sometimes offer package deals (e.g., three months upfront at a lower per-month rate) or loyalty schemes for returning customers, but standard first orders don't have "discount codes." Always ask your provider about any loyalty or package options when ordering. NHS prescriptions are subject only to standard prescription charges.
Why is private Mounjaro more expensive than Wegovy?
Mounjaro (tirzepatide) and Wegovy (semaglutide) have different mechanisms and dose ranges, which affects manufacturing and supply costs. Mounjaro's dual GIP+GLP-1 action may contribute to slightly higher pricing, but prices also vary by provider and dose. Costs aren't directly comparable — discuss individual pricing with prescribers for both medications to see which offers better value for your situation.
Can I get Mounjaro on the NHS without waiting years?
NHS Mounjaro access is through specialist weight management services only, with significant regional variation and lengthy waiting lists (often 12+ months in many areas). If you need treatment sooner, discuss private options with your GP. Some areas have shorter waits than others — contact your local ICB weight management service to check current waiting times.
What does my first Mounjaro prescription actually include?
Your first prescription is typically a single Mounjaro KwikPen (4 pre-filled doses for 4 weeks). The starting dose is 2.5 mg once weekly. You'll increase the dose every 4 weeks if tolerated, so your second order (usually 4 weeks later) will be a higher dose, potentially costing more. Budget for ongoing treatment, not just the first month.
How can I check if I'm eligible for Mounjaro before paying for a consultation?
Use our free BMI calculator above to check your BMI and see if you fall within the eligible range (BMI ≥30, or ≥27 with weight-related conditions). If you have South Asian, Black African, or Chinese heritage, lower thresholds apply. Eligibility also depends on health conditions and medication interactions, which a prescriber will assess during consultation.
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.