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 and Dizziness — UK Access and Cost Guide
Dizziness is a reported side effect of Mounjaro (tirzepatide), though it's not among the most common effects. If you're considering this prescription-only weight loss injection in the UK, it's important to understand both the potential side effects and how to access it — whether through the NHS or private routes. This guide covers what you need to know about dizziness with Mounjaro, plus the cost and access options available to UK adults. Our free GLP-1 weight loss calculator can help you explore potential outcomes with different doses.
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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.
Dizziness with Mounjaro and UK Prescription Access
Dizziness is listed as an uncommon side effect of Mounjaro (tirzepatide), meaning it may affect fewer than 1 in 100 people taking the medication. However, individual responses vary, and dizziness may occur alongside other common effects like nausea, vomiting, or dehydration. Dizziness with Mounjaro typically emerges during dose escalation or when the body is adjusting to the medication, and often resolves as your system adapts.
Why dizziness may occur: Rapid changes in blood sugar, dehydration from nausea or vomiting, changes in blood pressure, or the medication slowing gastric emptying can all contribute. If you experience persistent or severe dizziness, always inform your prescriber immediately.
In the UK, Mounjaro is available through two main routes: NHS specialist weight management services and private online prescribing following a clinical assessment. Understanding the cost and access differences helps you make an informed decision about which route suits your situation.
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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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Mounjaro Cost and Access in the UK — NHS vs Private
NHS route: Mounjaro is approved by NICE for use within NHS specialist weight management services, typically accessed through tier 3 services via GP referral. However, NHS availability varies significantly by region and ICB (Integrated Care Board). Many areas have lengthy waiting lists; in some regions, access is currently limited or unavailable. There is no direct cost to you if prescribed through the NHS, but eligibility and timing depend on your local service capacity.
Private route: Private online prescribing offers faster access. Following an online consultation with a UK-licensed prescriber, a prescription is issued and dispensed by a GPhC-registered pharmacy. Costs typically range from £129 to £320 per month depending on dose — lower doses (2.5–5 mg) cost less than higher maintenance doses (10–15 mg). Private access does not require NHS referral and is available without waiting lists. Your prescriber will assess whether Mounjaro is suitable and whether you're a good candidate if you experience side effects like dizziness.
- 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 dizziness a common side effect of Mounjaro?
Dizziness is uncommon with Mounjaro, affecting fewer than 1 in 100 people. However, it may occur during dose escalation or when adjusting to the medication. If you experience persistent dizziness, contact your prescriber immediately. Use our free BMI calculator to check your eligibility for Mounjaro before starting treatment.
How much does Mounjaro cost on the NHS in the UK?
Mounjaro is free if prescribed through the NHS, but access varies by region. Many areas have limited availability or waiting lists. Your GP can refer you to a specialist weight management service (tier 3) in your area to check eligibility and timescales.
What's the typical cost of private Mounjaro prescriptions in the UK?
Private Mounjaro costs typically range from £129 to £320 per month, depending on your dose. Lower starting doses (2.5–5 mg) are less expensive than higher maintenance doses (10–15 mg). Prices vary between providers, so it's worth comparing several services.
How long does an online Mounjaro prescription consultation take?
Most online consultations take 10–20 minutes. You'll be asked about your medical history, current medications, weight, height, and BMI. Your prescriber will determine eligibility based on UK guidelines (BMI ≥30 or ≥27 with weight-related health conditions). If approved, a prescription is issued to a GPhC-registered pharmacy.
Can dizziness with Mounjaro mean I should stop taking it?
Dizziness may resolve as your body adjusts, especially during dose escalation phases. However, always report it to your prescriber. They can assess whether it's medication-related, suggest staying hydrated, or adjust your dose. Never stop taking Mounjaro without medical guidance. Our weight loss calculator can help you track changes during treatment.
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.