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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Where to Get Mounjaro Online in the UK
Getting Mounjaro (tirzepatide) online in the UK requires a valid prescription from a UK-licensed prescriber — there is no "best" pharmacy, but there are important differences between NHS and private routes. This guide explains your options, how the process works, what eligibility looks like, and what to expect from legitimate UK online pharmacies. Whether you're exploring NHS access or private options, understanding the regulated pathway is essential.
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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.
How to Access Mounjaro in the UK: NHS vs Private Routes
NHS access: Mounjaro is approved by NICE for use within NHS specialist (tier 3) weight management services. Your GP can refer you to your local specialist weight management service, where a multidisciplinary team will assess your eligibility. NHS eligibility includes adults with a BMI of 30 or above, or BMI of 27–29.9 with weight-related health conditions such as type 2 diabetes, high blood pressure, or cardiovascular disease. However, NHS availability varies significantly by region (integrated care board), and waiting lists can be lengthy — often many months to over a year in some areas.
Private access: Licensed online pharmacies in the UK offer Mounjaro following an online clinical assessment with a UK-licensed prescriber. This route does not require NHS referral. The prescriber reviews your medical history and decides whether the medication is suitable. If approved, a prescription is issued and dispensed by a GPhC-registered pharmacy. Private access is typically faster than NHS but involves out-of-pocket costs. Always verify the pharmacy is registered with the GPhC (General Pharmaceutical Council) — this is your safeguard.
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.
What to Expect From a Legitimate UK Online Pharmacy
Legitimate UK online pharmacies that supply Mounjaro will always require a prescription from a UK-licensed prescriber — never offer Mounjaro without one. The online consultation should include health history questions, current medications, contraindications screening (pregnancy, breastfeeding, personal or family history of medullary thyroid cancer), and a decision by the prescriber about suitability. You will receive a valid UK prescription, and the pharmacy should be GPhC-registered. Be cautious of any online service that claims to supply Mounjaro without a proper assessment or that assures weight loss. Costs typically range from £129 to £320+ per month depending on dose, and supplies are usually available as individual KwikPens or multi-pack options with delivery to your home address within 2–5 working days.
- 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.
Can I get Mounjaro without a prescription in the UK?
No. Mounjaro (tirzepatide) is a prescription-only medicine in the UK. Any website claiming to supply it without a valid prescription from a UK-licensed prescriber is operating illegally. Always ensure your prescriber is registered with the MHRA or GMC (General Medical Council) and the pharmacy is GPhC-registered.
How long does NHS referral for Mounjaro usually take?
NHS waiting times vary widely by region. Some specialist services have waiting lists of 6–12 months or longer. Your GP can advise on current waiting times for your local integrated care board. Private online assessment is typically faster — usually 24–48 hours from consultation to prescription.
What's the difference between Mounjaro and Wegovy online?
Both require prescriptions and clinical assessment. Mounjaro (tirzepatide) is a dual GIP and GLP-1 agonist with a maximum dose of 15 mg once weekly. Wegovy (semaglutide) is a GLP-1 agonist with a maximum dose of 2.4 mg once weekly. Clinical trials showed Mounjaro resulted in slightly higher average weight loss (~20.9% body weight) compared to Wegovy (~14.9%), though results vary individually.
Is it safe to buy Mounjaro online?
Yes, if you use a GPhC-registered UK pharmacy and the prescription comes from a UK-licensed prescriber. Always check the pharmacy's GPhC registration on the official register at register.pharmacyregulation.org. Avoid any supplier without verified registration or one that doesn't require a proper medical assessment.
Can I switch from NHS Mounjaro to private if I'm on a waiting list?
Yes. You can pursue private prescription while on an NHS waiting list — there's no rule against this. However, if you later access it through NHS, inform your GP to avoid duplication. Your prescriber (NHS or private) can advise on dose continuation if you switch between routes.
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.