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
Free tracker included with every download this week
1 Month On Mounjaro: Cost And Access In The UK
Starting Mounjaro (tirzepatide) in the UK typically involves either NHS specialist referral or private prescription. After your first month, you'll likely still be on the starter dose (2.5 mg), with costs and access routes varying significantly depending on whether you pursue NHS or private routes. This guide explains how to access Mounjaro, what the first month costs, and what to expect during your initial weeks on this weight management injection.
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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.
Private Mounjaro Cost In The UK
Private prescription costs for Mounjaro in the UK typically range from £150 to £250 per month, depending on the dose and provider. During your first month, you'll almost certainly be on the 2.5 mg starter dose — each KwikPen contains four weekly injections, so one pen covers your first month.
- Starting dose (2.5 mg): approximately £150–£180 per month
- Private online consultation fee: typically £25–£50
- Total first month cost: approximately £175–£230
Prices vary between GPhC-registered pharmacies. You'll need a prescription from a UK-licensed prescriber following an online clinical assessment. The Mounjaro KwikPen must be refrigerated and stored at 2–8°C until use. After opening, it can be kept at room temperature (below 30°C) for up to 30 days. Our GLP-1 weight loss calculator can help you understand potential outcomes at different doses as you progress beyond month one.
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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 Access Versus Private Routes
The NHS approach to Mounjaro requires referral to a tier 3 specialist weight management service through your GP. Eligibility depends on BMI (30 or above, or 27+ with weight-related health conditions) and assessment criteria. However, NHS waiting lists can be extremely long — in some regions, waits exceed 18 months. Private access is faster: you can complete an online consultation within days and begin treatment within 1–2 weeks. Private prescribers assess your eligibility against the same NICE criteria as NHS services, but without the waiting list. Using our free BMI calculator, you can check whether your BMI likely meets the threshold for either route before contacting your GP or a private 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.
How much does Mounjaro cost per month on the NHS?
Mounjaro on the NHS is free at the point of dispensing, but access is through NHS specialist weight management services only — not standard GP prescription. You must be referred by your GP and meet NICE eligibility criteria. Waiting lists vary by region; many areas have significant delays.
What's included in the first month cost when going private?
Private costs usually cover the online consultation (£25–£50), the prescription fee (£0–£15), and the medication itself (£150–£180 for the 2.5 mg starter dose). Some providers bundle costs; always check what's included before proceeding.
Can I get Mounjaro through my GP without going private?
Only through NHS specialist services, not standard GP prescription. Your GP can refer you to your local tier 3 weight management service if you meet criteria. Private routes bypass this waiting process but involve upfront costs.
What does dose titration mean, and how does it affect my first month costs?
Dose titration is the gradual increase of your Mounjaro dose over weeks. Your first month is always the 2.5 mg starter dose. Each dose increase happens weekly, so your second month may cost more if you step up to 5 mg. This is planned and expected.
Is Mounjaro cheaper than Wegovy in the UK?
Costs are similar — both typically range £150–£250/month privately depending on dose. The main difference is mechanism: Mounjaro is a dual GIP/GLP-1 agonist, while Wegovy is GLP-1 only. Your prescriber will advise which is suitable for you.
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.