It works very well to support weight loss, but like all medicines, Mounjaro can bring on side effects. Sometimes, that includes dizziness.
We know that feeling dizzy isn’t pleasant. And if it happens at the start of your treatment journey, you might feel a bit apprehensive for what’s to come.
But we want to reassure you that dizziness on Mounjaro is usually nothing to worry about—and it doesn’t mean that the medicine isn’t working. Besides, it can be easier to deal with if you understand why it happens and how to manage it. Here’s what you need to know.
How common is dizziness with Mounjaro?
It’s pretty common. Up to one in ten people might experience dizziness on Mounjaro.
Generally speaking, you’re more likely to experience Mounjaro side effects when you start the medicine or increase your dose.
Why does Mounjaro cause dizziness?
Wondering why you feel dizzy on Mounjaro? There are a few possible explanations.
Low blood pressure
Because it can help you lose weight, Mounjaro can lower your blood pressure. While for some people, this might be good news, dizziness has been reported as a knock-on effect. In one study, it affected 4.6% of people using Mounjaro compared to 2.3% in the placebo group.
Low blood sugar (hypoglycemia)
Mounjaro works by making you feel full, and one way it does that is to stimulate the release of insulin when you eat. This also keeps your blood sugar levels in check. But if you’re taking another medicine that could also affect your blood sugar, your levels might drop too low.
Dizziness is a sign of hypoglycemia, along with sweating, confusion, feeling jittery, and more.
Dehydration
Over one in ten people on Mounjaro might experience vomiting or diarrhoea. Both of these symptoms deplete your fluids, and if you don’t drink enough water to top them up there’s a risk you’ll get dehydrated. This can make you feel dizzy.
Allergic reaction
It’s rare, but some people might have an allergic reaction to Mounjaro. This can bring on dizziness, as well as swelling of your face, lips, tongue, or throat. If you think this is happening to you, contact your doctor right away.
What should I do if I feel dizzy after taking Mounjaro?
Dizziness tends to clear up on its own. Though there are some things you can do to make yourself feel better while it’s happening.
If you can, lie down until the feeling passes. And if you do have to move around, try to be as slow and careful as possible. Aim to get plenty of rest, while drinking lots of fluids (especially water).
It’s also a good idea to avoid coffee and alcohol, as they can dehydrate you. We wouldn’t recommend getting up or bending down suddenly, either.
If you suspect the dizziness is due to low blood sugar, a sugary drink or snack may help. Try a small glass of a non-diet fizzy drink or fruit juice, a banana or some biscuits.
How to prevent dizziness
This is a tough one, because there’s no way to predict which side effects you’ll experience on Mounjaro—nor any way to guarantee you won’t feel dizzy.
However, you can reduce your risk of side effects by taking Mounjaro exactly as your provider says. That includes starting on the lowest strength of the medicine so your body can get used to it, before gradually increasing your dose.
We’d also recommend avoiding alcohol while on Mounjaro. Alcohol can cause dizziness too, and these effects can overlap and make you feel worse.
Side effects support at Voy
"If you're using Voy and you experience any side effects, rest assured that our expert clinicians are just a message or phone call away. They can adjust your dose, prescribe medication to ease your symptoms, or simply offer reassurance.
Everyone responds differently to weight loss treatment and we'll help you find what feels right for you."
When to seek medical help
Usually, dizziness will go away on its own. But if your symptoms get worse or don’t clear up, then you should check in with your doctor.
Sometimes dizziness can be a sign that something else is going on, so if you get any other symptoms like having trouble speaking, double or blurred vision, numbness in your face, arms, or legs, fainting, or changes to your pulse, that also calls for a doctor’s visit.
Your weight loss journey
We get that learning about a medicine’s side effects might make you feel a bit nervous to try it.
But again, with Mounjaro injections, side effects are usually nothing to worry about. And generally, dizziness with Mounjaro is pretty manageable.
As part of our weight loss programme, you’ll get one-to-one support from our team of clinicians and coaches who can answer all your questions about side effects. They’ll be right there with you throughout your journey, supporting and cheering you on. We’ll also post your weight loss medication to you each month.
Find out if you’re eligible for the programme by filling out this short quiz.
¹“Dehydration.” NHS
. www.nhs.uk/conditions/dehydration. Accessed 10 Mar. 2025.
²“Dizziness.” NHS. www.nhs.uk/conditions/dizziness. Accessed 10 Mar. 2025.
³Krumholz, Harlan M, et al. “Tirzepatide and Blood Pressure Reduction: Stratified Analyses of the SURMOUNT-1 Randomised Controlled Trial.” Heart, vol. 110, no. 19, 2024:1165-1171 https://pmc.ncbi.nlm.nih.gov/articles/PMC11420724/.
⁴“Low Blood Sugar (Hypoglycaemia).” www.nhs.uk/conditions/low-blood-sugar-hypoglycaemia/. Accessed 10 Mar. 2025.
⁵“Mounjaro: Information for the Patient.” Electronic Medicines Compendium. www.medicines.org.uk/emc/files/pil.15481.pdf. Accessed 10 Mar. 2025.
⁶“Mounjaro: Full Prescribing Information.” Food and Drug Administration. www.accessdata.fda.gov/drugsatfda_docs/label/2022/215866s000lbl.pdf. Accessed 10 Mar. 2025.
⁷Ringer, Matthew, et al. “Orthostatic Hypotension,” in StatPearls, Treasure Island (FL): StatPearls Publishing 2025 https://www.ncbi.nlm.nih.gov/books/NBK448192/ Accessed 10 Mar. 2025.
⁸“Tirzepatide (Mounjaro) Factsheet.” NHS, www.medwayswaleformulary.co.uk/media/1753/tirzepatide-factsheet.pdf. Accessed 10 Mar. 2025.
