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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How to Get Mounjaro Through an Online Clinic in the UK
If you're considering Mounjaro (tirzepatide) for weight management, online clinics offer a convenient way to access this prescription-only injection in the UK without waiting for NHS referral. An online clinic provides a licensed prescriber who conducts a clinical assessment, and if Mounjaro is appropriate for you, issues a prescription that's dispensed by a GPhC-registered pharmacy. This guide explains how online clinics work, eligibility requirements, and what the process typically involves so you can make an informed decision.
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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.
How Online Clinics Assess You for Mounjaro
When you use an online clinic for Mounjaro, the first step is completing a detailed health questionnaire covering your medical history, current medications, weight, height, and any weight-related conditions like type 2 diabetes, high blood pressure, or sleep apnoea. A UK-licensed prescriber reviews your answers and may request additional information such as blood pressure readings or recent blood test results.
The prescriber assesses whether tirzepatide is clinically appropriate for you based on NHS eligibility criteria: a BMI of 30 kg/m² or above, or 27–29.9 with weight-related health conditions. Use our free BMI calculator above to check your current BMI instantly. If you meet eligibility criteria and have no contraindications (such as personal or family history of certain thyroid cancers), the prescriber will issue a prescription. This prescription is then sent to a GPhC-registered pharmacy, which dispenses your Mounjaro KwikPen with full instructions and support.
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.
UK Prescription Requirements and Costs
Mounjaro is prescription-only in the UK — you cannot purchase it without a valid prescription from a licensed prescriber. Online clinic consultations typically cost £15–£40, and the Mounjaro medication itself ranges from approximately £129–£320 per month depending on your dose (starting at 2.5 mg, titrating up to a maximum of 15 mg weekly). Costs vary between providers, so it's worth comparing services.
Unlike NHS access through specialist tier 3 weight management services (which often have waiting lists of months or years), private online clinics offer faster access. However, you bear the full cost yourself. Always ensure the online clinic is registered with the GPhC and employs registered prescribers to assures safe, legal access to medication.
- 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's the difference between seeing a GP and using an online clinic for Mounjaro?
Your GP can refer you to NHS specialist weight management services (tier 3), but waiting lists vary by region and can be lengthy. An online clinic offers faster private access if you meet eligibility criteria and can afford the cost. Both require clinical assessment; online clinics simply bypass the NHS referral route.
Can I get Mounjaro on the NHS through an online clinic?
No. Online clinics are private services. NHS Mounjaro access is through specialist tier 3 weight management services following GP referral. Costs differ significantly — NHS is free, private online clinics charge for consultation and medication.
How long does an online clinic assessment for Mounjaro take?
Initial assessment typically takes 24–48 hours. You submit your health questionnaire online, a prescriber reviews it, and if approved, your prescription is issued to a pharmacy within 1–2 working days. Medication delivery is usually within 3–5 working days.
What if I'm on other medications — will an online clinic still prescribe Mounjaro?
The prescriber reviews all your medications for interactions. Some medications like oral contraceptives may need adjustment (barrier methods recommended alongside) since Mounjaro can reduce oral medication absorption. Disclose all medications honestly on your questionnaire.
Is Mounjaro the same as Wegovy, and can I switch between them?
Both are weight loss injections but work differently. Mounjaro (tirzepatide) is a dual GIP and GLP-1 agonist; Wegovy (semaglutide) is GLP-1 only. Clinical trials show similar average weight loss (~15–21% with Mounjaro, ~15% with Wegovy), though results vary individually. Switching requires prescriber guidance and cannot be done simultaneously.
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.