Mounjaro and Heart Rate: What People Commonly Notice

Mounjaro is a dual GIP and GLP-1 receptor agonist. GLP-1 receptors are present in cardiac tissue, and stimulating them can lead to a small increase in resting heart rate in some people. This is noted in the medicine's prescribing information and is considered a known, monitored effect rather than an unexpected one.

How common is it?

Not everyone notices a change. When it does occur, the increase is typically modest — often just a few beats per minute above a person's usual baseline. It is different from the more noticeable sensation of heart palpitations on Mounjaro, which some people also report and which tends to feel like fluttering or skipped beats rather than a steadily elevated rate.

Mounjaro and heart attacks — what the evidence says

GLP-1 receptor agonists as a class have been studied for cardiovascular outcomes. At the time of writing, the available data does not suggest tirzepatide increases the risk of heart attacks; ongoing cardiovascular outcome studies continue to examine this. If you have a history of heart disease or cardiovascular concerns, your prescriber will have considered this when recommending the medicine — it is not something to assess on your own. Any chest pain, pressure, or symptoms that feel cardiac in origin should be treated as a medical emergency and you should seek urgent care immediately.

Related experiences some people describe

A raised heart rate can sometimes accompany feelings of anxiety or unease. Some people also describe episodes that feel like panic attacks while on Mounjaro — a distinct but sometimes overlapping experience worth discussing with your prescriber. For context on other less-obvious effects people associate with Mounjaro, see our overview of Mounjaro and hormonal or systemic effects.

For a deeper look specifically at elevated heart rate patterns, the page on increased heart rate on Mounjaro explores what users commonly report and what to monitor.

One of the most practical things you can do if you notice heart rate changes is keep a consistent record — not to self-diagnose, but so that when you do speak to your prescriber, you arrive with real data rather than a vague impression.

GLP Trackr's side-effect tracking lets you log cardiovascular sensations — elevated heart rate, palpitations, or feelings of racing — alongside the date, time, and your dose stage. Over days and weeks, patterns often become visible: does it tend to occur in the first day or two after a new dose? Does it ease as the week progresses? That kind of detail is genuinely useful to bring to a clinical appointment.

The daily check-in also captures mood and energy, which can provide useful context alongside any cardiovascular notes — especially if you are trying to distinguish between anxiety-related sensations and a physiological change in resting rate.

GLP Trackr also generates a doctor report summarising your logged data, so you can share a clear picture of your journey — including any side effects — with your prescriber at your next appointment.

Important: if you experience chest pain, shortness of breath, fainting, or a heart rate that feels dangerously fast or irregular, contact a healthcare professional promptly or seek emergency care. GLP Trackr is a tracking tool — it does not replace clinical assessment, and any concerning cardiovascular symptoms should always be evaluated by your prescriber or doctor. Any changes to your dose or treatment plan are their decision, not one to make alone.

You can read more about Mounjaro's broader profile and what to expect on your journey on our Mounjaro information hub.

Start logging how you feel after each dose and let the data do the talking at your next appointment. GLP Trackr is free to try for 7 days — available on the App Store and Google Play.