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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Mounjaro 7.5 Mg Pen: Cost, Access & How to Get It in the UK
The Mounjaro 7.5 mg pen is a mid-range dose of tirzepatide, typically used after 8–12 weeks of lower-dose titration. In the UK, accessing this dose depends on whether you go through the NHS or private prescription routes — with significantly different costs, timelines, and availability. This guide explains what to expect, how much it costs, and your options for getting Mounjaro safely. Eligibility for weight loss medication depends on your BMI and health profile, which a prescriber will assess before issuing a prescription.
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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 7.5 Mg Cost in the UK: NHS vs Private Routes
Private prescription cost: A 7.5 mg Mounjaro pen costs between £130–£250 per month through UK private prescribing services, depending on the provider and whether you're buying a single pen or a 3-month supply. Each KwikPen contains four pre-filled doses (one month's supply at once-weekly injections). Cost varies because different GPhC-registered online pharmacies set their own prices; some offer discounts for longer-term commitments.
- NHS route: Free on prescription through tier 3 specialist weight management services, but availability is extremely limited and waiting lists can stretch 12–24 months in many areas
- Private online services: Typically charge £129–£320 per month depending on dose; the 7.5 mg dose sits mid-range in pricing
- What's included: Price usually covers the medication, prescriber consultation, and pharmacy dispensing
Mounjaro vs Wegovy comparison: semaglutide (Wegovy) pricing is similar in the private market, though tirzepatide (Mounjaro) may show faster average weight loss in clinical trials — though individual results vary significantly.
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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.
Free Weight Loss Tools & Guides
Everything you need to understand your weight, explore medication options, and track your progress — completely free.
How to Access Mounjaro 7.5 Mg: NHS vs Private Prescription Process
NHS route: Refer to your GP, who can request assessment through NHS tier 3 specialist weight management services if your BMI and health profile meet criteria. However, NHS access is rationed; many areas have long waiting lists or limited capacity, and some ICBs (Integrated Care Boards) have strict eligibility thresholds. Ask your GP about local availability.
Private prescription route: Complete an online health questionnaire and video or telephone consultation with a UK-licensed prescriber. If approved, your prescription is sent to a GPhC-registered pharmacy, which dispatches the medication to your home. The process typically takes 3–7 working days from consultation to delivery. This route requires no NHS referral, making it faster but requiring out-of-pocket payment. Use our GLP-1 weight loss calculator to estimate potential results at the 7.5 mg dose.
- 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 a single 7.5 mg Mounjaro pen cost in the UK?
A single Mounjaro 7.5 mg KwikPen costs between £130–£250 through private prescription services in the UK, depending on the provider. Each pen contains four doses (one month's supply). NHS prescription is free if you can access tier 3 specialist services, though availability is very limited and waiting lists are long in most areas.
Is Mounjaro 7.5 mg available on the NHS in the UK?
Mounjaro is approved by NICE for NHS use in specialist tier 3 weight management services, but access is extremely limited due to rationing and long waiting lists. Eligibility requires BMI ≥30 or BMI ≥27 with weight-related health conditions. Ask your GP about local tier 3 services, though availability varies significantly by region.
How long does it take to reach the 7.5 mg dose on Mounjaro?
Mounjaro follows a dose titration schedule: 2.5 mg for weeks 1–4, then 5 mg for weeks 5–8, then 7.5 mg for weeks 9–12. Each dose increase requires a minimum of four weeks. Most people reach 7.5 mg around week 9 of treatment. Your prescriber may adjust this timeline based on side effects or response.
Can I buy Mounjaro 7.5 mg without a prescription online?
No. Mounjaro is a prescription-only medicine in the UK and must be prescribed by a UK-licensed healthcare professional following a clinical assessment. Legitimate online prescribing services require a health questionnaire and consultation before issuing a prescription — avoid unregulated sellers.
How does Mounjaro 7.5 mg pricing compare to Wegovy in the UK?
Mounjaro and Wegovy have similar pricing in the private UK market (£129–£250/month depending on dose and provider). Mounjaro's 7.5 mg dose is roughly equivalent to Wegovy's 1.7 mg dose in terms of potency, though individual weight loss results vary. Both require clinical assessment and prescription.
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.