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 5.0mg in the UK — Cost and How to Access It
Mounjaro (tirzepatide) 5.0mg is the first standard maintenance dose after the starting phase. In the UK, you can access this medication through either the NHS or private prescription routes, each with different costs and availability. This guide explains your options, what to expect, and the factors that affect access and pricing.
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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.
Mounjaro 5.0mg Cost in the UK
Private cost for Mounjaro 5.0mg typically ranges from £129 to £199 per month through GPhC-registered online pharmacies, depending on the provider and whether you're purchasing a single pen or a month's supply. The 5.0mg dose is usually reached after 4 weeks on the 2.5mg starting dose, meaning you'll progress from starter pens to maintenance pens during your first month of treatment.
- Each pre-filled KwikPen contains 4 weekly doses (one month's supply)
- Private pricing does not include the GP consultation fee, which typically ranges from £40 to £150
- Some providers offer package discounts for purchasing multiple months in advance
- NHS access is free at the point of care but requires referral to specialist weight management services and may involve significant waiting times
Costs vary between providers, so comparing options before starting treatment is recommended. Use our free BMI calculator to check your eligibility criteria before pursuing a prescription.
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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.
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NHS vs Private Access for Mounjaro 5.0mg
NHS route: You must be referred to a tier 3 specialist weight management service by your GP. NICE approved tirzepatide for use within NHS services, but regional availability varies significantly across England, Scotland, Wales, and Northern Ireland. Waiting lists can exceed 6–12 months in many areas.
Private route: Complete an online clinical assessment with a UK-licensed prescriber through a GPhC-registered pharmacy. If approved, you receive a prescription and begin treatment within days. The 5.0mg dose is typically reached within 4 weeks. You progress through dose titration: 2.5mg week 1–4, then 5.0mg week 5 onwards. Private access is faster but self-funded.
Both routes require a clinical assessment confirming you meet eligibility criteria: BMI 30+ or BMI 27–29.9 with weight-related health conditions like type 2 diabetes or hypertension.
- 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 long does it take to reach the 5.0mg Mounjaro dose?
The standard dose escalation takes 4 weeks. You start with 2.5mg in week 1–4, then move to 5.0mg in week 5. This gradual approach allows your body to adjust and helps minimise side effects like nausea. Your prescriber will monitor your progress before considering further dose increases.
Is Mounjaro 5.0mg available on the NHS?
Yes, NICE approved tirzepatide (Mounjaro's generic name) for NHS use within specialist weight management services. However, availability depends on your region, waiting lists can be very long, and access varies between NHS trusts. Your GP can refer you to your local tier 3 service to check eligibility and waiting times.
What does the 5.0mg private prescription cost include?
The £129–£199 monthly cost typically covers the pre-filled KwikPen (containing 4 weekly 5.0mg doses), NHS delivery, and basic pharmacy support. It does not include the initial online consultation fee (£40–£150) or any follow-up prescriber appointments. Some providers bundle consultations into their pricing.
Can I switch from NHS to private Mounjaro, or vice versa?
Switching routes is possible but requires coordination with your prescriber. If switching from NHS to private, you'll need a new online assessment with a private prescriber. If switching from private to NHS, discuss this with your GP who can refer you to specialist services. Any switch should be managed carefully to avoid gaps in treatment.
What should I expect during a private online consultation for Mounjaro?
You'll complete a medical questionnaire covering your weight, height, health conditions, medications, and weight loss goals. A UK-licensed doctor reviews your form, assesses whether Mounjaro is suitable, and issues a prescription if appropriate. This typically takes 24–48 hours. You then collect your prescription from the partner pharmacy and arrange delivery.
Ready to take control of your weight loss journey?
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