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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Cheapest Mounjaro 5mg in the UK — Pricing and Access
Mounjaro 5mg is the first maintenance dose in the titration schedule, typically reached after 4 weeks of starting treatment at 2.5mg. Cost varies significantly depending on whether you access Mounjaro through the NHS or a private prescription. This guide explains UK pricing, how the 5mg dose fits into your treatment plan, and what to expect when budgeting for this weight loss 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.
Understanding Mounjaro 5mg Pricing in the UK
Mounjaro is a prescription-only medicine available in the UK through two routes: NHS specialist weight management services or private online prescribing.
Private pricing for Mounjaro 5mg: Most GPhC-registered online pharmacies charge between £129–£180 per KwikPen (4-week supply) at the 5mg dose, though prices vary. This is often the cheapest private option since 5mg is the first maintenance tier — lower doses like 2.5mg are starting doses only. A full month's supply at 5mg typically costs £129–£180 privately.
NHS pricing: If eligible and referred to a tier 3 specialist weight management service, Mounjaro may be available free on the NHS, though availability varies significantly by region and waiting lists can extend months or years.
Tirzepatide alternatives: Some private providers offer generic tirzepatide (the active ingredient in Mounjaro) at potentially lower costs, though availability and regulation varies — always use GPhC-registered pharmacies only.
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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.
Mounjaro Dose Titration and the Role of 5mg
Mounjaro requires dose titration — you start at 2.5mg and increase every 4 weeks based on response and tolerability. The 5mg dose is typically where most people stabilise initially. Each KwikPen contains 4 doses (4 weeks of injections), so purchasing at 5mg means you're buying your first maintenance supply after the starting phase.
To estimate potential outcomes and decide whether Mounjaro is right for your budget, use our GLP-1 weight loss calculator to project results at different doses. This can help inform your decision about whether the investment is worthwhile for your goals. Compare pricing across GPhC-registered pharmacies — legitimate providers should require a prescription and clinical assessment, never sell without verification.
Use our free BMI calculator to understand your current BMI and eligibility for weight loss treatment. This helps contextualise why Mounjaro might be recommended and what health outcomes you're targeting. Always obtain Mounjaro on prescription only — never purchase from unregulated sources. Prescription-only status exists to ensure you receive clinical assessment before starting, protecting your safety.
- 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 Mounjaro 5mg the cheapest dose in the UK?
No — the 2.5mg starting dose is technically the cheapest single injection, but you cannot stay on 2.5mg long-term. The 5mg dose is the first maintenance tier and represents the cheapest sustainable cost per month. Prices rise as doses increase (7.5mg, 10mg, 15mg are more expensive).
Can I get Mounjaro 5mg free on the NHS?
Potentially, if referred to an NHS tier 3 specialist weight management service and approved for treatment. However, NHS availability is extremely limited and varies by region — many areas have waiting lists of many months. Private prescription is often faster but costs £129–£180 per month.
How does Mounjaro 5mg compare to Wegovy for cost?
Mounjaro 5mg and Wegovy (semaglutide) pricing are similar in the UK — both typically £129–£200 privately per month. Mounjaro's 5mg dose may show slightly better weight loss results in clinical trials compared to Wegovy's equivalent dose, but individual outcomes vary. Your prescriber can advise which is better for you.
What's included in the price of Mounjaro 5mg?
The price covers one KwikPen with 4 pre-filled doses (one dose per week for 4 weeks). Shipping, clinical assessments, and pharmacy fees may be additional — check with your provider. NHS prescriptions include the medication only; private providers may charge consultation fees separately.
Is there a cheaper way to get Mounjaro tirzepatide in the UK?
Always use GPhC-registered pharmacies with a valid UK prescription. Generic tirzepatide may be cheaper than branded Mounjaro, but ensure any provider requires proper clinical assessment. Never buy from unregulated overseas sources — the NHS and medicines regulators warn against this as safety cannot be assured.
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.