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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Dizziness On Mounjaro: What You Need To Know
Dizziness is a reported side effect that some people experience when taking Mounjaro (tirzepatide), particularly during the initial weeks or when the dose increases. This side effect is typically mild and often improves as your body adjusts to the medication. However, understanding why dizziness occurs, when to seek medical attention, and how to access Mounjaro safely in the UK is essential for anyone considering this prescription weight management injection. If you're experiencing dizziness on Mounjaro, your GP can assess whether to continue, adjust your dose, or explore alternative options.
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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.
Why Dizziness Occurs On Mounjaro And How To Manage It
Dizziness on Mounjaro can occur for several reasons. As a dual GIP and GLP-1 receptor agonist, tirzepatide slows how quickly food moves through your stomach and signals fullness to your brain, which can lead to reduced food intake and lower blood pressure. This blood pressure drop is often the primary cause of dizziness, particularly when standing up quickly (orthostatic hypotension). Additionally, nausea—a very common side effect—can contribute to feelings of lightheadedness.
Most people who experience dizziness find it improves within a few days to weeks as their body adapts. To manage dizziness: rise slowly from sitting or lying down, stay well-hydrated, eat small regular meals even if you don't feel hungry, and avoid sudden movements. Dizziness is listed as a common side effect in clinical trials, affecting up to 1 in 10 people. If dizziness is severe, persistent, or accompanied by chest pain, shortness of breath, or vision changes, contact your GP immediately—these could indicate a more serious condition.
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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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Accessing Mounjaro In The UK: NHS And Private Routes
In the UK, Mounjaro (tirzepatide) is available through two routes: the NHS specialist services pathway and private prescription access. Through the NHS, you can be referred by your GP to a tier 3 specialist weight management service if you meet eligibility criteria (BMI 30 or above, or 27–29.9 with weight-related health conditions). NHS access is free but waiting lists vary significantly by region—some areas have delays of several months to years. Privately, Mounjaro is dispensed by GPhC-registered online pharmacies following an online consultation with a UK-licensed prescriber. Private costs typically range from £129–£320 monthly depending on your dose, with no NHS waiting list. Both routes require a clinical assessment to ensure Mounjaro is safe and appropriate for you. Your prescriber will discuss potential side effects, including dizziness, and monitor you throughout treatment.
- 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 serious side effect of Mounjaro?
Dizziness is a common but usually mild side effect that often improves as your body adjusts. However, if it's severe, persistent, or accompanied by chest pain, shortness of breath, or vision changes, seek medical attention immediately. These could indicate a more serious underlying issue requiring urgent assessment.
What dose of Mounjaro causes dizziness most often?
Dizziness can occur at any dose during dose titration (the gradual increase from 2.5 mg to 15 mg). It's most common during the first weeks and when increasing doses, as your body adapts. Starting with the lowest dose (2.5 mg) and waiting at least 4 weeks before increasing helps minimise dizziness risk.
How much does Mounjaro cost privately in the UK?
Private Mounjaro costs vary by dose and provider, typically ranging from £129–£320 per month. Costs increase with higher doses (2.5 mg is cheaper than 15 mg). Always compare prices across GPhC-registered providers and check what's included (consultations, delivery, follow-up support).
Can I get Mounjaro on the NHS for dizziness-related weight management?
Yes, if you're eligible. You can be referred by your GP to an NHS tier 3 specialist weight management service if you have a BMI of 30 or above, or 27–29.9 with weight-related health conditions. Prescribers will assess dizziness risk and monitor you during treatment.
What's the difference between Mounjaro and Wegovy for dizziness side effects?
Both Mounjaro (tirzepatide) and Wegovy (semaglutide) can cause dizziness through similar mechanisms—blood pressure reduction and nausea. Clinical data suggests comparable rates, though individual experiences vary. Your prescriber can discuss which is more suitable for you based on your health profile.
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