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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Not Hungry on Mounjaro — How to Access in the UK
If you're not hungry on Mounjaro, you're experiencing the primary effect of tirzepatide — this dual GIP and GLP-1 receptor agonist works by reducing appetite and helping you feel fuller after smaller meals. But how do you access Mounjaro in the UK, and what does it cost? This guide covers NHS and private prescription routes, eligibility, and what the entire process involves so you can make an informed decision about weight management with this prescription-only medication.
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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 Costs in the UK — Private Access
If you're accessing Mounjaro privately in the UK, costs vary significantly depending on your dose and the prescribing service. Typical monthly costs range from approximately £129 to £320+, depending on which dose you're on.
The starting dose, 2.5 mg, is generally the least expensive. As you titrate upwards through the 5 mg, 7.5 mg, 10 mg, 12.5 mg, and 15 mg doses, costs increase incrementally. Each Mounjaro KwikPen contains four weeks' supply (four injections), so monthly costs reflect the dose-specific pricing.
Private costs include the clinical assessment fee (typically £20–£50), the prescription fee, and the medication itself. Some services offer package pricing or subscription models that may reduce per-dose costs. Always compare providers, as pricing differs across registered online pharmacies, though this information is educational only — speak to your GP or prescriber about which route suits your circumstances.
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 vs Private Routes — Eligibility & Access
NHS access: Mounjaro is available through NICE-approved specialist tier 3 and tier 4 weight management services, but you must be referred by your GP. NHS access varies dramatically by region — some areas have waiting lists of several months or longer, and availability depends on your local Integrated Care Board (ICB). To check NHS eligibility, speak to your GP about referral to specialist weight management services in your area.
Private access: You can obtain Mounjaro privately without NHS referral by consulting a UK-licensed prescriber online. Following a clinical assessment (usually a questionnaire and sometimes a video consultation), a prescriber will assess whether tirzepatide is appropriate for you. If approved, your prescription is sent to a GPhC-registered pharmacy for dispensing. Private access typically takes days, not weeks, though it requires upfront payment.
- 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 does Mounjaro cost privately in the UK per month?
Private Mounjaro costs range from approximately £129 to £320+ per month depending on your dose, with 2.5 mg being the least expensive. Costs increase as you titrate to higher doses (5 mg, 10 mg, 15 mg). Each KwikPen contains four injections, so the monthly cost reflects your current dose. Pricing varies between providers, so compare options across registered online pharmacies.
Is Mounjaro available on the NHS in the UK?
Yes, Mounjaro is NICE-approved and available through NHS specialist tier 3 and tier 4 weight management services. However, you must be referred by your GP, and availability varies significantly by region. Some areas have lengthy waiting lists. Contact your GP to ask about specialist weight management referral in your local area.
How do I access Mounjaro privately in the UK?
Register with a UK-licensed online prescriber, complete a clinical assessment (usually a questionnaire), and if approved, receive a prescription sent to a GPhC-registered pharmacy. Private access typically takes several days. You'll pay for the consultation and medication upfront. Ensure the service is registered and that the prescriber is UK-licensed.
Do I need a referral to get Mounjaro privately?
No. Private access does not require an NHS referral — you can approach a private prescriber directly. However, you still need a clinical assessment, and the prescriber must determine that tirzepatide is appropriate for you based on your health profile, eligibility criteria (BMI, comorbidities), and medical history.
What's included in the private cost of Mounjaro?
Private costs typically include the online consultation/assessment fee (£20–£50), the prescription fee, and the medication itself. Some services bundle these into a single monthly price. Always clarify what's included before committing. Compare several providers to understand the total cost at your target 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.