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 Dosing in the UK — Cost and Access
Mounjaro (tirzepatide) is a prescription-only weight management injection available in the UK through NHS specialist services or private prescribing. Understanding the dosing schedule, cost, and access routes helps you make informed decisions about whether this GLP-1 alternative is right for you. This guide covers the standard dose escalation, UK pricing context, and both NHS and private pathways to obtaining tirzepatide treatment.
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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.
Mounjaro Dosing Schedule and UK Private Costs
Mounjaro is administered as a once-weekly injection, with doses escalating every 4 weeks to find the effective maintenance level. Starting dose: 2.5 mg for weeks 1–4. Escalation: increases to 5 mg, 7.5 mg, 10 mg, 12.5 mg, and finally 15 mg (the maximum licensed dose). Each KwikPen contains 4 weeks' supply of a single dose.
Private UK costs typically range from £129 to £320 per month depending on dose and provider. Lower doses (2.5–5 mg) cost less; maximum dose (15 mg) is at the higher end. Prices vary between GPhC-registered online pharmacies following clinical assessment. Important: costs do not include the initial consultation fee, which is usually £30–£50.
- 4-week supply per KwikPen
- Prescription required from UK-licensed prescriber
- Storage: refrigerate unopened; keep at room temperature up to 30 days after first use
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 Access vs Private Routes and the Consultation Process
NHS route: Mounjaro is approved by NICE for NHS specialist weight management services (tier 3). Access requires GP referral and assessment by a specialist multidisciplinary team. Availability varies significantly by region and waiting times can be lengthy — some areas have waiting lists of several months or longer.
Private route: Available through an online consultation with a UK-licensed prescriber. You complete a health questionnaire, the prescriber assesses your eligibility based on BMI and any weight-related health conditions, and if approved, a prescription is issued to a GPhC-registered pharmacy for dispensing. The entire process typically takes 24–48 hours. Use our GLP-1 weight loss calculator to estimate potential outcomes at different doses before pursuing treatment.
- 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 starting dose of Mounjaro and how quickly does it increase?
The starting dose is 2.5 mg once weekly for 4 weeks, then escalates to 5 mg, 7.5 mg, 10 mg, 12.5 mg, and finally 15 mg. Each dose level is maintained for a minimum of 4 weeks before increasing. Most people reach an effective maintenance dose (often 10–15 mg) within 4–5 months.
How much does Mounjaro cost in the UK on prescription?
Private prescription costs in the UK typically range from £129 to £320 per month depending on dose and pharmacy. A 4-week supply (one KwikPen) costs more at higher doses. Add £30–£50 for the initial online consultation. NHS access is free but requires referral and specialist assessment.
Can I access Mounjaro through the NHS in the UK?
Yes, Mounjaro is NICE-approved for NHS specialist weight management services. Access requires a GP referral to your local tier 3 weight management service and clinical assessment. Availability and waiting times vary significantly by region — some areas have long waiting lists.
How do I get a Mounjaro prescription privately in the UK?
Book an online consultation with a UK-registered prescriber through a GPhC-registered online pharmacy. Complete a health questionnaire, discuss your weight loss goals, and if approved, receive a prescription. The pharmacy then dispenses your KwikPens. Most consultations take 24–48 hours from appointment to prescription.
How is Mounjaro different from Wegovy in terms of dosing and cost?
Mounjaro (tirzepatide) is a dual GIP and GLP-1 receptor agonist with a maximum dose of 15 mg weekly. Wegovy (semaglutide) is a single GLP-1 agonist with a maximum of 2.4 mg weekly. Clinical trials showed Mounjaro produced slightly greater average weight loss, though individual results vary. UK private costs are similar (£129–£320/month depending on dose).
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.