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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What Are The Maintenance Doses Of Mounjaro?
Mounjaro (tirzepatide) maintenance doses range from 5 mg to 15 mg, given as a once-weekly injection. The specific dose you receive depends on your individual response, tolerance to side effects, and your prescriber's assessment. Most people start at a lower dose and gradually increase every four weeks until reaching an effective maintenance level. Your GP or licensed prescriber will monitor your progress and adjust your Mounjaro UK prescription accordingly. Understanding the full dosing schedule helps you know what to expect on your weight management journey.
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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.
Mounjaro Maintenance Dose Schedule And Titration
Mounjaro is typically started at 2.5 mg weekly, then increased in 2.5 mg increments every four weeks. Here's the standard titration schedule:
- Weeks 1–4: 2.5 mg (starting dose)
- Weeks 5–8: 5 mg (first maintenance option)
- Weeks 9–12: 7.5 mg
- Weeks 13–16: 10 mg
- Weeks 17–20: 12.5 mg
- Week 21 onwards: 15 mg (maximum dose)
The 5 mg, 10 mg, and 15 mg doses are the most commonly used maintenance doses in UK clinical practice. Your prescriber will assess your weight loss response and side effects at each stage before recommending escalation. Not everyone needs to reach the maximum dose — many people achieve their weight loss goals at 5 mg, 10 mg, or lower doses. Individual response varies significantly, so your maintenance dose is personalised to your needs.
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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.
Cost, Access, And NHS Vs Private Routes In The UK
NHS access to Mounjaro for weight management is through specialist tier 3 or tier 4 weight management services, typically following a GP referral. Availability and waiting times vary significantly by region and ICB. Private access is available through GPhC-registered online prescribing services following an online clinical assessment. Private Mounjaro costs typically range from £129 to £320+ per month depending on your maintenance dose, with higher doses (10 mg, 15 mg) costing more than lower maintenance doses (5 mg). Each KwikPen contains four weekly doses. Before starting any Mounjaro UK prescription — whether NHS or private — you'll have a clinical assessment to confirm eligibility and suitability. Use our free GLP-1 weight loss calculator to explore potential outcomes at different doses.
- 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 is the most common Mounjaro maintenance dose?
The 5 mg weekly dose is the most frequently prescribed maintenance dose in UK clinical practice. However, many people move to 10 mg or 15 mg for greater weight loss effect. Your prescriber will recommend the best maintenance dose for your individual response and goals.
How quickly does Mounjaro escalate to maintenance dose?
The standard schedule increases every four weeks. You start at 2.5 mg for weeks 1–4, then move to 5 mg at week 5. Most people reach their target maintenance dose between weeks 5 and 21, depending on tolerance and response.
Can you stay on a lower Mounjaro maintenance dose?
Yes. If you achieve good weight loss and side effect tolerance at 5 mg or 7.5 mg, your prescriber may recommend staying at that dose rather than escalating further. There's no requirement to reach 15 mg if lower doses work effectively for you.
How much does a monthly supply of Mounjaro cost privately in the UK?
Private Mounjaro costs typically range from £129–£320+ per month depending on your maintenance dose. Lower doses (5 mg) cost less than higher doses (15 mg). Each monthly KwikPen contains four weekly injections.
Is Mounjaro available on the NHS for weight management?
Yes, Mounjaro is approved by NICE for use within NHS specialist weight management services. Access requires a GP referral to tier 3 or tier 4 services. Availability and waiting times vary significantly across different UK regions.
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.