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 Much Does Mounjaro Cost Online in the UK?
If you're looking for Mounjaro online in the UK, you'll find prices vary significantly depending on whether you access it through the NHS or private prescribing services. Mounjaro (tirzepatide) is a prescription-only weight management injection, and the cost depends on your dose level, where you get it, and how many pens you purchase. This guide covers UK pricing, how to access Mounjaro affordably, and what you should expect from the online prescription process.
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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.
Private Mounjaro Costs and Pricing in the UK
Private online Mounjaro costs in the UK typically range from £129 to £320 per month, depending on your dose level. Each KwikPen contains 4 weekly doses, so one pen usually lasts 4 weeks. Starting doses (2.5 mg) are often cheaper than higher maintenance doses (15 mg), as manufacturers and providers set different pricing tiers.
Most private prescribing services charge a consultation fee (usually £20–£50) upfront, which is often credited against your first prescription. Bulk purchasing multiple pens can sometimes reduce the per-dose cost. Prices vary between providers, so comparing online before committing is sensible. Some services offer subscription models where you pay monthly, while others require upfront payment per pen or batch.
- Starting dose (2.5 mg): typically £129–£180/month
- Mid-range doses (5–10 mg): typically £180–£250/month
- Maximum dose (15 mg): typically £250–£320/month
These are approximate ranges — actual prices vary. Always confirm current pricing with your chosen prescriber before starting treatment.
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: Access Routes and Eligibility
NHS access to Mounjaro is free at the point of care, but availability is severely limited. Mounjaro is only available through specialist tier 3 and tier 4 weight management services, usually after referral from your GP. Waiting lists in many areas are 6–18 months or longer. Not all NHS regions currently commission Mounjaro funding, so regional postcode can determine whether you're eligible at all.
Private access is faster and doesn't require NHS referral. You complete an online consultation with a UK-licensed prescriber, who assesses your eligibility and health history. If approved, a prescription is issued and dispensed by a GPhC-registered pharmacy. This process typically takes 24–48 hours. Using our free GLP-1 weight loss calculator, you can estimate potential weight loss outcomes at different dose levels before committing to 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.
Is Mounjaro cheaper through the NHS or private prescribing?
Mounjaro is free on the NHS, but NHS availability is very limited with long waiting lists (months to years in many areas). Private prescribing costs £129–£320/month depending on dose, but offers faster access without waiting. Cost vs. waiting time is a personal decision.
What happens during an online consultation for private Mounjaro?
You answer medical history questions, disclose any medications or conditions, confirm your weight and height, and discuss weight loss goals. The prescriber reviews this and decides if Mounjaro is suitable. If approved, you receive a prescription within 24–48 hours, dispensed by a UK pharmacy.
Can I get a cheaper Mounjaro prescription online?
Prices are fairly standardised between UK prescribing services (£129–£320/month by dose). You can compare costs between providers, but don't expect significantly cheaper options. Lower cost shouldn't be your only factor—prescriber quality and pharmacy reputation matter more.
Do I need NHS referral to get private Mounjaro online?
No. Private online prescribing is independent of the NHS. You don't need a GP referral or NHS approval. You simply book an online consultation with a licensed UK prescriber, pay privately, and receive your prescription and medication directly.
What's included in private Mounjaro pricing?
Pricing typically covers the medication (one KwikPen with 4 doses) and the consultation fee. Storage and delivery may be included or charged separately. Some services offer follow-up prescriber support. Always check what's included before purchasing.
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.