Methimazole and Heart palpitations - a phase IV clinical study of FDA data

Summary:

Heart palpitations is reported as a side effect among people who take Methimazole (methimazole), especially for people who are female, 50-59 old, have been taking the drug for < 1 month also take Benadryl, and have Crohn's disease.

The phase IV clinical study analyzes which people have Heart palpitations when taking Methimazole. It is created by eHealthMe based on reports of 7,420 people who have side effects when taking Methimazole from the FDA, and is updated regularly.

What is Methimazole?

Methimazole has active ingredients of methimazole. It is often used in hyperthyroidism. eHealthMe is studying from 8,016 Methimazole users. Check the latest studies of Methimazole.

What is Heart palpitations?

Heart palpitations (feelings or sensations that your heart is pounding or racing) is found to be associated with 2,445 drugs and 3,633 conditions by eHealthMe. Check the latest studies of Heart palpitations.

On Apr, 26, 2026

7,420 people reported to have side effects when taking Methimazole.
Among them, 107 people (1.44%) have Heart palpitations.

Could Methimazole cause Heart palpitations?

Among these 107 people:

How long have people been on Methimazole when they have Heart palpitations? *

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What is the gender of people who have Heart palpitations when taking Methimazole? *

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What is the age of people who have Heart palpitations when taking Methimazole? *

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* Approximation only. Some reports may have incomplete information.

Do you take Methimazole and have Heart palpitations?

- Check whether Heart palpitations is associated with a drug or a condition
- Predict drug outcomes for up to one year with AI
- Get an AI agent to monitor your drugs continuously

Related studies:

Effectiveness of, long term effects of, and alternative drugs to Methimazole:

Methimazole (8,016 reports)

Heart palpitations treatments and more:

Heart palpitations (147,650 reports)

How severe was Heart palpitations and when was it recovered:

Heart palpitations in Methimazole

Expand to all the drugs that have ingredients of methimazole:

Heart palpitations and drugs with ingredients of methimazole (141 reports)

Sub-studies by gender and age:

Female: 0-1 2-9 10-19 20-29 30-39 40-49 50-59 60+

Male: 0-1 2-9 10-19 20-29 30-39 40-49 50-59 60+

Browse all side effects of Methimazole:

a b c d e f g h i j k l m n o p q r s t u v w x y z

Browse all the drugs that are associated with Heart palpitations:

Heart palpitations (2,445 drugs)

Browse all the conditions that are associated with Heart palpitations:

Heart palpitations (3,633 conditions)

How the study uses the data?

The study uses data from the FDA. It is based on methimazole (the active ingredients of Methimazole) and Methimazole (the brand name). Other drugs that have the same active ingredients (e.g. generic drugs) are not considered. Dosage of drugs is not considered in the study.

How to use the study?

DO NOT STOP MEDICATIONS without first consulting your doctor. If there are any serious or long term adverse effects discovered in the study, discuss the study with your doctor to ensure that proper medication management will be in place if applicable.

Who is eHealthMe?

With medical big data and proven AI/ML algorithms, eHealthMe provides a platform for everyone to run phase IV clinical trials. We study millions of patients and 5,000 more each day. Results of our real-world drug study have been referenced on 800+ peer-reviewed medical publications, including The Lancet, Mayo Clinic Proceedings, and Nature. Our analysis results are available to researchers, health care professionals, patients (testimonials), and software developers (open API).

WARNING, DISCLAIMER, USE FOR PUBLICATION

WARNING: Please DO NOT STOP MEDICATIONS without first consulting a physician since doing so could be hazardous to your health.

DISCLAIMER: All material available on eHealthMe.com is for informational purposes only, and is not a substitute for medical advice, diagnosis, or treatment provided by a qualified healthcare provider. All information is observation-only. Our phase IV clinical studies alone cannot establish cause-effect relationship. Different individuals may respond to medication in different ways. Every effort has been made to ensure that all information is accurate, up-to-date, and complete, but no guarantee is made to that effect. The use of the eHealthMe site and its content is at your own risk.

If you use this eHealthMe study on publication, please acknowledge it with a citation: study title, URL, accessed date.