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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Cheapest Mounjaro 7.5mg in the UK — Cost & Comparison Guide
Finding the cheapest Mounjaro 7.5mg in the UK depends on whether you're accessing it through NHS specialist services or private online prescribing. At the 7.5mg dose, Mounjaro (tirzepatide) is typically available through private UK pharmacies following a clinical assessment, with costs ranging from approximately £150–£220 per KwikPen depending on the provider. This guide compares Mounjaro 7.5mg pricing with Wegovy and explains what to expect at this dose level. Both are prescription-only medicines that require assessment by a UK-licensed prescriber before supply.
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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.
Mounjaro 7.5mg vs Wegovy — Mechanism, Trial Data & Cost
Mounjaro 7.5mg is an escalation dose in the titration schedule — typically reached around weeks 9–12 of treatment. At this point, Mounjaro's dual GIP and GLP-1 mechanism becomes more evident in clinical outcomes. The SURMOUNT-1 trial showed average weight loss of approximately 15% of body weight at 5mg, rising to 19.5% at 10mg and 20.9% at the maximum 15mg dose.
- Mounjaro 7.5mg cost: Typically £150–£220 per pen (4-week supply) through private UK pharmacies
- Wegovy 1.7mg equivalent: Approximately £130–£180 per pen, also requiring clinical assessment
- Mechanism difference: Mounjaro activates both GIP and GLP-1 pathways; Wegovy activates GLP-1 only
- Individual response: Results vary significantly — some patients see better outcomes on one vs the other
Cost alone should not drive the choice. Your prescriber will assess which medication is more suitable based on your health profile, previous response to GLP-1 treatment, and medical history. Try our GLP-1 weight loss calculator to explore projected outcomes at different doses of each medication.
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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.
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Everything you need to understand your weight, explore medication options, and track your progress — completely free.
Which Is Right for You? Clinical Assessment & Suitability
Both Mounjaro and Wegovy at comparable doses (Mounjaro 7.5mg ≈ Wegovy 1.7mg) require a UK-licensed prescriber's clinical assessment before prescription. Your prescriber will consider your BMI, weight-related health conditions, previous medication responses, and contraindications. Mounjaro is generally preferred by some patients who don't respond as well to GLP-1 alone, owing to its dual mechanism. Wegovy has longer clinical trial data in the weight management setting. Neither medication is "better" — suitability is individual.
To understand your eligibility, use our BMI calculator above to check your current classification. Adults with a BMI of 30 or above (or 27+ with weight-related conditions) may be eligible. Whichever medication your prescriber recommends, remember that prescription weight loss treatment works alongside a reduced-calorie diet and increased physical activity — not instead of these lifestyle changes.
- 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.
How much does Mounjaro 7.5mg cost in the UK?
Private prescribing typically costs £150–£220 per KwikPen (4-week supply) depending on the pharmacy. NHS access is through specialist tier 3/4 weight management services, availability varies by region. Always check with the prescribing pharmacy for exact current pricing, as costs can change.
Is Mounjaro 7.5mg cheaper than Wegovy in the UK?
Prices are comparable. Mounjaro 7.5mg (£150–£220) is similar to Wegovy 1.7mg (£130–£180). Cost difference is typically £10–40 per pen. Clinical suitability should be the primary consideration — your prescriber will recommend based on your health, not price alone.
How long does a Mounjaro 7.5mg pen last?
One KwikPen contains four pre-filled doses — one injection per week — so each pen lasts 4 weeks. At week 9–12 of your treatment schedule, you'll typically be receiving one 7.5mg injection per week, meaning one pen covers one month of treatment.
Can I get Mounjaro 7.5mg on the NHS in the UK?
Mounjaro is available on the NHS through specialist weight management services (tier 3/4). Referral is through your GP, but availability and waiting times vary significantly by region and NHS integrated care board. Private prescribing is generally faster but involves a cost.
Why might my prescriber choose Mounjaro 7.5mg over Wegovy?
Mounjaro's dual GIP+GLP-1 mechanism may be more effective for patients who don't respond adequately to GLP-1-only medications like Wegovy. Some patients experience better appetite suppression or weight loss on the dual mechanism. Your prescriber assesses your individual suitability during clinical assessment.
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.