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 Blurred Vision — UK Costs and How to Access
Blurred vision is a potential side effect of Mounjaro (tirzepatide) that some users report, though it's not listed as a common side effect. If you experience vision changes while taking this medication, you should contact your prescriber or GP immediately — especially if you have diabetes, as these changes could indicate a more serious concern. This guide explains what blurred vision with Mounjaro means, UK access routes, and prescription costs so you can make informed decisions about your treatment.
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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.
Understanding Blurred Vision and Mounjaro Access in the UK
Blurred vision is not listed as a common side effect of Mounjaro in clinical trials, but some users report visual disturbances. This may occur due to rapid changes in blood sugar levels (especially if you also have diabetes) or, rarely, as part of a serious allergic reaction. If you experience blurred vision, vision changes, or any eye problems while taking Mounjaro, you should contact your prescriber or GP urgently — do not wait for your next scheduled appointment. Your prescriber may need to review your other medications or examine whether your diabetes management (if applicable) needs adjustment. It's important to distinguish between temporary vision blur (which can happen with any rapid metabolic change) and persistent or worsening vision problems (which may require urgent medical review). Our GLP-1 weight loss calculator can help you understand expected outcomes on Mounjaro, but safety concerns like vision changes always require professional medical guidance, not estimation tools.
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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.
NHS vs Private Mounjaro: Prescription Routes and Costs in the UK
NHS route: Mounjaro is available on the NHS through specialist tier 3 weight management services, but access is limited and varies significantly by region. Your GP can refer you, though waiting lists can extend many months or years depending on your integrated care board (ICB). You do not pay for the medication itself if prescribed on the NHS, but you may wait a long time for assessment.
Private route: You can obtain a Mounjaro prescription through a private online consultation with a UK-licensed prescriber. Private prescription costs typically range from £180–£320 per month depending on dose (starting at 2.5 mg through to 15 mg maximum). Private prescriptions can be dispensed by GPhC-registered pharmacies. The online consultation process is straightforward: complete a health questionnaire, have a video or telephone consultation with a prescriber, and if approved, your prescription is sent to a pharmacy for dispensing. Individual results vary, and a prescriber will assess your eligibility based on your BMI and health history.
- 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 blurred vision with Mounjaro be serious?
Blurred vision is not a common Mounjaro side effect, but it can occasionally occur. If you develop vision changes, contact your GP or prescriber immediately. This is especially important if you have diabetes, as vision blur could indicate blood sugar changes or, rarely, a serious complication. Never ignore persistent vision problems.
How much does Mounjaro cost on the NHS in the UK?
Mounjaro is free if prescribed on the NHS, but access is through specialist tier 3 services and involves waiting lists that vary by region (sometimes months to years). Your GP can refer you, but availability depends on your integrated care board's funding and capacity.
What does a private Mounjaro prescription cost in the UK?
Private Mounjaro prescriptions typically cost £180–£320 per month depending on your dose (from 2.5 mg to 15 mg). This covers the prescription and medication dispensed by a GPhC-registered pharmacy. Costs vary slightly between providers, so it's worth comparing options.
How do I get a private Mounjaro prescription online in the UK?
Complete a health questionnaire with a UK-registered online prescriber, have a brief video or phone consultation, and if approved, your prescription is sent to a GPhC-registered pharmacy for dispensing. The process typically takes 24–48 hours from consultation to delivery.
Is Mounjaro the same as Wegovy for cost?
No. Mounjaro (tirzepatide) and Wegovy (semaglutide) have different manufacturers, mechanisms, and costs. Mounjaro typically costs £180–£320/month depending on dose. Wegovy costs vary similarly. Both require prescription and clinical assessment. A prescriber can advise which is more suitable for you.
Ready to take control of your weight loss journey?
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