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
Free tracker included with every download this week
Cheapest 10mg Mounjaro Pen — UK Cost & Comparison Guide
Finding the cheapest 10mg Mounjaro pen in the UK requires understanding both cost and clinical suitability. Mounjaro (tirzepatide) at 10mg is an escalated dose typically reached after 12 weeks of treatment, offering different mechanisms and costs than Wegovy. Both are prescription-only and require clinical assessment before prescribing. This guide compares the two, covering cost variations, mechanism differences, and how to access either medication affordably across the NHS and private routes. Individual results vary significantly, and prescriber eligibility assessment determines which is appropriate for you.
10,000+ calculations today · NHS-aligned thresholds · 100% free
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 10mg vs Wegovy — Clinical Mechanism & Trial Data
Mounjaro (tirzepatide) works as a dual GIP and GLP-1 receptor agonist, activating two hormone pathways to regulate appetite, reduce cravings, and support feeling fuller after smaller meals. In the SURMOUNT-1 clinical trial, participants on the 10mg dose achieved an average weight loss of approximately 19.5% of their body weight over 72 weeks, alongside a reduced-calorie diet and increased physical activity.
Wegovy (semaglutide) activates the GLP-1 pathway only, producing similar appetite-reduction effects through a single mechanism. The STEP-1 trial showed average weight loss of approximately 14.9% at the maximum 2.4mg dose. The dose progression for Wegovy is also slower: 0.25mg → 0.5mg → 1mg → 1.7mg → 2.4mg over 16+ weeks, compared to Mounjaro's faster titration reaching 10mg by week 12.
- Average weight loss: Mounjaro 10mg ~19.5% vs Wegovy 2.4mg ~14.9% in clinical trials
- Mechanism: Mounjaro dual-action vs Wegovy single-action GLP-1
- Injection frequency: Both once-weekly via KwikPen auto-injector
- Individual results vary — trial data represents averages only
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 Costs & Accessing Cheapest Mounjaro 10mg & Wegovy
In the UK, both Mounjaro 10mg and Wegovy are available through NHS specialist tier 3 weight management services or private online prescribing. NHS access varies significantly by region and involves referral through your GP; waiting lists can extend months to years in many areas. Private pricing ranges approximately £129–£320 per month depending on dose and provider. Mounjaro KwikPens contain 4 doses (4 weeks' supply) — the 10mg dose pen typically costs £220–£280 privately, while Wegovy's lowest maintenance cost is around £200–£250 monthly. Both require prescription from a UK-licensed prescriber following clinical assessment. Your prescriber will assess BMI, health conditions, medication interactions, and individual suitability — cost alone does not determine eligibility. Use our free GLP-1 weight loss calculator to compare potential outcomes at different doses.
- 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 Mounjaro 10mg and Wegovy 2.4mg?
Mounjaro 10mg uses dual GIP+GLP-1 mechanism (average clinically studied weight loss in trials), while Wegovy 2.4mg uses GLP-1 only (average clinically studied weight loss). Both are once-weekly injections. Mounjaro reaches 10mg by week 12; Wegovy reaches maximum dose by week 16+. Individual results vary based on adherence, diet, and activity.
How much does the cheapest 10mg Mounjaro pen cost in the UK?
Private costs range £220–£280 per Mounjaro KwikPen (4-week supply). NHS access is free but requires specialist referral and varies by region. Always check current pricing with GPhC-registered pharmacies and NHS availability in your area through your GP.
Can I get Mounjaro 10mg or Wegovy on the NHS?
Both are available through NHS tier 3 specialist weight management services. You'll need GP referral and assessment based on BMI ≥30 or BMI 27–29.9 with weight-related health conditions. Waiting lists vary significantly by region (ICB). Private prescription may be faster but costs apply.
Which is better — Mounjaro 10mg or Wegovy?
Neither is universally "better" — suitability depends on your health, medical history, and prescriber assessment. Mounjaro may offer greater average weight loss in trials, but Wegovy suits others. A UK-licensed prescriber will assess contraindications, interactions, and individual factors to recommend the right option for you.
How long before Mounjaro reaches the 10mg dose?
Mounjaro titration is: 2.5mg weeks 1–4 → 5mg weeks 5–8 → 7.5mg weeks 9–12 → 10mg weeks 13–16. Each dose increase requires minimum 4 weeks on that dose. Total time to 10mg: approximately 16 weeks. Wegovy titration is slower, taking 16+ weeks to maximum 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.