Symptoms
GLP-1 and heart palpitations: why your heart may race
July 23, 2026 · 2 min read
The short answer
GLP-1 receptor agonists are known to modestly increase resting heart rate, and some people notice palpitations or a racing heart. This is usually mild. Palpitations are also commonly caused by low blood sugar, dehydration, caffeine, and anxiety, which the medication can indirectly promote.
Steadying blood sugar and hydration, and easing caffeine, resolve most cases. Palpitations with chest pain, fainting, breathlessness, or an irregular sustained fast heartbeat need urgent medical assessment.
Can GLP-1 drugs cause palpitations?
GLP-1 receptor agonists (Ozempic, Wegovy, Mounjaro, Zepbound) are known to modestly raise resting heart rate, typically by a few beats per minute. Most people never notice it, but some feel palpitations, a racing, pounding, or fluttering heartbeat, especially early on. This is generally mild and, importantly, it sits alongside strong cardiovascular safety data for the class, so a slightly higher heart rate is not the same as heart harm. Even so, palpitations are unsettling and worth understanding, because they often have a fixable indirect cause.
The common indirect causes
- Low blood sugar. Eating much less, and irregularly, can dip blood sugar, and hypoglycemia classically causes a racing heart, shakiness, and sweating. This is more likely if you also take insulin or a sulfonylurea.
- Dehydration. Reduced appetite usually means drinking less, and dehydration can make the heart beat faster and feel like it is pounding.
- Caffeine and stimulants. On a much smaller food intake, your usual coffee can hit harder and trigger palpitations.
- Anxiety and poor sleep. Both raise heart rate and the awareness of your heartbeat.
What helps
Address the drivers. Keep blood sugar steady with regular, balanced meals rather than long fasts, and treat shaky, sweaty palpitations as possible low blood sugar if you take insulin or a sulfonylurea (our low blood sugar post covers this). Stay hydrated with electrolytes if intake is low. Ease back on caffeine and see if it helps. Protect sleep. Our dizziness post and anxiety post cover overlapping symptoms.
When palpitations need a clinician
Occasional brief palpitations that settle are usually benign, but do not ignore certain patterns. Seek urgent care for palpitations that come with chest pain, fainting or near-fainting, severe breathlessness, or a fast heartbeat that is clearly irregular or does not stop. Tell your prescriber about frequent or worsening palpitations, or any known heart condition, so your overall picture is reviewed. Logging palpitations next to your dose days, meals, and caffeine in DoseLog helps show what is triggering them. This article is general information, not medical advice.
Questions people ask
Can Ozempic or tirzepatide cause heart palpitations?
GLP-1 drugs modestly raise resting heart rate, and some people notice palpitations, usually mild. Palpitations are also commonly caused by low blood sugar, dehydration, caffeine, and anxiety, which the medication can indirectly promote by reducing food and fluid intake.
Are heart palpitations on a GLP-1 dangerous?
Usually not; a small rise in heart rate is a known class effect and sits alongside strong cardiovascular safety data. But palpitations with chest pain, fainting, severe breathlessness, or a sustained irregular fast heartbeat need urgent medical assessment.
How do I stop palpitations on a GLP-1?
Keep blood sugar steady with regular balanced meals, stay hydrated with electrolytes if intake is low, ease back on caffeine, and protect sleep. If palpitations come with shakiness and sweating and you take insulin or a sulfonylurea, treat it as possible low blood sugar.
When should I see a doctor about a racing heart on a GLP-1?
Seek urgent care for palpitations with chest pain, fainting, severe breathlessness, or a fast heartbeat that is irregular or does not stop. Tell your prescriber about frequent or worsening palpitations or any known heart condition so your risk is reviewed.
References
- 1.Ozempic and Wegovy (semaglutide) prescribing information: dosing, adverse reactions, and warnings. View label on DailyMed ↗
- 2.Reviews of heart-rate increase with GLP-1 receptor agonists. Find on PubMed ↗
- 3.Hypoglycemia, dehydration, and palpitations reviews. Find on PubMed ↗
This article is general education, not medical advice. DoseLog is a tracking and reflection tool. Decisions about your medication, dose, and symptoms belong with a licensed clinician.
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