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 Hacks: Cost, Access & Practical Tips in the UK
Mounjaro (tirzepatide) is a prescription-only weight management injection available in the UK, but understanding your access options and costs is essential before starting treatment. Whether you're exploring NHS or private routes, this guide covers practical strategies to help you navigate the system, understand pricing at different doses, and know what to expect from a clinical consultation. Our free GLP-1 weight loss calculator can help you explore potential outcomes alongside understanding the real costs involved.
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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 Cost in the UK
Private prescription costs for Mounjaro vary significantly by dose and provider, typically ranging from £129 to £320+ per month depending on the strength you're prescribed. The starting dose (2.5 mg) is usually less expensive than maintenance or higher doses, and some providers offer tiered pricing structures. When budgeting for Mounjaro, remember that each KwikPen contains 4 doses (a month's supply), so monthly costs reflect one full pen. Many private prescribing services offer transparent pricing upfront — always compare costs across providers and check whether consultations are charged separately or included. Some providers offer subscription models where you pre-arrange regular doses, which may offer slight cost savings. Factor in that you'll need ongoing GP support even on private prescription, and any escalation in dose will increase your monthly costs. Budget for approximately 6–9 months of treatment if aiming for the maximum 15 mg dose, as dose titration takes 20 weeks minimum.
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: Which Route Suits You?
NHS access to Mounjaro is through specialist tier 3 weight management services, following GP referral — treatment is free, but waiting lists often exceed 12 months depending on your region. Private online prescribing is faster (typically 1–2 weeks) but costs money upfront; you avoid NHS waiting lists and don't need a GP referral, though you still require a clinical assessment from a UK-licensed prescriber. The online consultation process involves completing a health questionnaire, undergoing a brief video or phone assessment, and receiving a prescription if approved — your prescription is then dispensed by a GPhC-registered pharmacy. Many people choose private routes for speed and convenience, whilst others prioritise NHS routes for cost. Consider your budget, timeline, and how soon you want to start when deciding which suits your circumstances.
- 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's the actual cost of Mounjaro per month in the UK?
Private Mounjaro costs typically range from £129–£320+ monthly depending on your dose. Starting dose (2.5 mg) is cheaper; higher doses cost more. Each KwikPen is a 4-week supply. NHS access through specialist services is free after GP referral, but waiting lists are often very long (12+ months in many areas).
How long does dose titration take and how much will it cost?
Dose titration takes minimum 20 weeks to reach maximum (15 mg). You'll spend approximately 4–5 weeks on each dose level. Total cost across 6 months varies, but budget £600–£1,600+ if paying privately for the full titration schedule. Your prescriber sets the escalation schedule based on your response.
Can I get Mounjaro on the NHS without a long wait?
NHS access requires referral to your regional tier 3 specialist weight management service. Availability and waiting times vary dramatically by region — some areas have waits of 18+ months. Check with your GP whether your ICB has capacity. Private prescription bypasses the wait entirely but requires upfront payment.
What happens during an online consultation for a private prescription?
You'll complete a medical questionnaire, then have a brief video or phone assessment with a UK-licensed prescriber who evaluates your eligibility, BMI, health conditions, and medications. If approved, they issue a prescription to a GPhC-registered pharmacy, which dispenses your Mounjaro KwikPen. The whole process typically takes 1–2 weeks.
Are there ways to reduce the cost of private Mounjaro?
Compare prices across different GPhC-registered providers — costs vary. Some offer subscription or multi-month discounts. Starting at the lowest dose (2.5 mg) costs less initially. Some providers bundle consultations, reducing overall costs. Always check whether your prescription can be reviewed by your NHS GP once started, as some GP practices will support ongoing monitoring at no cost.
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.