Trulicity® (dulaglutide) and dizziness

Which documents count dizziness

The US label’s main table only admits reactions reported by at least 5% of adults on Trulicity® and more often than on placebo, and the EU table ranks reactions by frequency class. ^[1][3] Dizziness reaches neither. The Canadian Table 2 uses a lower 1% bar and counts every event that emerged during treatment, whatever its cause, which is why dizziness appears there and nowhere else. ^[4]

What a 1.4-point gap means

Most people in the Canadian pool, on Trulicity® or placebo, did not report dizziness. On both doses about one or two extra people in every hundred did, and the rate did not rise from 0.75 mg to 1.5 mg. ^[4] The monograph also lists syncope (fainting) and vertigo among less common events seen in trials, without rates. ^[4]

Drug-safety databases add a little. A 2025 analysis of US adverse event reports for six GLP-1 medicines, dulaglutide among them, found a reporting signal for dizziness across the class, with about 45% of neurological reports arising within the first 30 days. ^[5] A 2026 study of hearing and balance reports found that dulaglutide reports leaned towards reduced hearing, while vertigo and tinnitus were more prominent in liraglutide and semaglutide reports. ^[6] Both studies rely on voluntary reports, so they show patterns in reporting, not how often dizziness happens or whether the medicine caused it.

Four routes from the pen to a light head

• Fluid loss: nausea, vomiting and diarrhoea are the most frequent Trulicity® reactions, and the label warns that dehydration from them has led to kidney injury, mostly when treatment begins or the dose goes up. ^[1] MedlinePlus lists dizziness or light-headedness among the signs of severe dehydration. ^[10]
• Low blood sugar: with insulin or a sulfonylurea, the label asks that the dose of those medicines be reviewed, and the Medication Guide names dizziness or light-headedness first among the signs. ^[1][2] In a 78-week trial with a sulfonylurea, about one person in five on Trulicity® had a reading below 54 mg/dL. ^[1]
• Heart rate and rhythm: average heart rate rose by 2 to 4 beats per minute, and the PR interval on the heart tracing lengthened slightly. ^[1] The Canadian patient information explains that, rarely, medicines with these effects can change heart rhythm enough to cause dizziness, palpitations or fainting, more often in people with heart disease or on certain other medicines. ^[4]
• Blood pressure: in a 755-person study, dulaglutide lowered systolic blood pressure by 2.8 mmHg more than placebo, with no change in the lower number. ^[3] That is a small effect, but it can add to other causes of feeling faint on standing, such as blood pressure medicines or fluid loss. ^[8]

Other things that make people dizzy

MedlinePlus separates light-headedness, the feeling you might faint, from vertigo, the sense that you or the room are spinning. ^[7] Light-headedness comes from too little blood reaching the brain: a sudden fall in blood pressure, dehydration, standing up too fast, flu, colds, allergies, low blood sugar or medicines that lower blood pressure. Vertigo more often comes from the inner ear, such as benign positional vertigo, labyrinthitis after a viral infection, or Ménière disease. ^[7]

Cleveland Clinic notes that dizziness on standing, called orthostatic hypotension, tends to be worse in the morning and in heat, and that diabetes and medicines for blood pressure, heart disease or depression raise the risk. ^[8] Many people starting Trulicity® already take several of these, so a medicine review is often the most useful step.

What the guidance describes

For light-headedness on standing, MedlinePlus suggests avoiding sudden changes in posture, getting up from lying down slowly and sitting for a few moments first, and having something to hold on to. ^[7] During vertigo it advises keeping still, increasing activity slowly and avoiding driving or climbing until a week after symptoms stop. ^[7] Cleveland Clinic suggests giving yourself time to stand and talking to a provider about whether any of your medicines could be involved. ^[8]

The Trulicity® Medication Guide asks you to drink fluids to lower the chance of dehydration and to let your provider know if nausea, vomiting or diarrhoea continues. ^[2] If you use insulin or a sulfonylurea, the EU leaflet says to avoid driving or using machines if you notice any sign of low blood sugar. ^[3]

Trulicity® is a registered trademark of Eli Lilly and Company. PepLabo is not affiliated with or endorsed by Eli Lilly and Company.

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