Malarone and Atrial fibrillation/flutter - a phase IV clinical study of FDA data

Summary:

Atrial fibrillation/flutter is reported as a side effect among people who take Malarone (atovaquone; proguanil hydrochloride), especially for people who are male, 60+ old, have been taking the drug for < 1 month also take Allopurinol, and have Quit smoking.

The phase IV clinical study analyzes which people have Atrial fibrillation/flutter when taking Malarone. It is created by eHealthMe based on reports of 2,660 people who have side effects when taking Malarone from the FDA, and is updated regularly.

What is Malarone?

Malarone has active ingredients of atovaquone; proguanil hydrochloride. It is often used in malaria. eHealthMe is studying from 3,098 Malarone users. Check the latest studies of Malarone.

What is Atrial fibrillation/flutter?

Atrial fibrillation/flutter (atrial fibrillation and flutter are abnormal heart rhythms in which the atria, or upper chambers of the heart, are out of sync with the ventricles) is found to be associated with 2,362 drugs and 3,844 conditions by eHealthMe. Check the latest studies of Atrial fibrillation/flutter.

eHealthMe: drug outcomes in the real world

eHealthMe runs one of the largest post-marketing drug safety studies in the world. We study millions of patients and 5,000 more each day. Our data-driven phase IV clinical trials have been referenced on 800+ peer-reviewed medical publications including The Lancet, Mayo Clinic Proceedings, and Nature. Tools to study our phase IV findings are available to the public, anonymous and free >>>.

On Aug, 21, 2026

2,660 people reported to have side effects when taking Malarone.
Among them, 16 people (0.6%) have Atrial fibrillation/flutter.

Could Malarone cause Atrial fibrillation/flutter?

Among these 16 people:

How long have people been on Malarone when they have Atrial fibrillation/flutter? *

What is the gender of people who have Atrial fibrillation/flutter when taking Malarone? *

female: 6.67 %
male: 93.33 %

What is the age of people who have Atrial fibrillation/flutter when taking Malarone? *

What are other drugs people take besides Malarone? *

What are other side effects people have besides Atrial fibrillation/flutter? *

Arrhythmias (irregular heartbeat): 7 people, 43.75%
Dyspnea (difficult or laboured breathing): 6 people, 37.50%
Fever: 5 people, 31.25%
Pain: 5 people, 31.25%
Appetite - Decreased (decreased appetite occurs when you have a reduced desire to eat): 5 people, 31.25%
Stress And Anxiety: 5 people, 31.25%
Back Pain: 4 people, 25.00%
Hypoaesthesia (reduced sense of touch or sensation): 4 people, 25.00%
Headache (pain in head): 4 people, 25.00%
Muscle Tightness: 4 people, 25.00%

What are the existing conditions these people have? *

Quit Smoking: 1 person, 6.25%

* Approximation only. Some reports may have incomplete information.

Do you take Malarone and have Atrial fibrillation/flutter?

- Check whether Atrial fibrillation/flutter 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 Malarone:

Malarone (3,098 reports)

Atrial fibrillation/flutter treatments and more:

Atrial fibrillation/flutter (349,229 reports)

How severe was Atrial fibrillation/flutter and when was it recovered:

Atrial fibrillation/flutter in Malarone

Expand to all the drugs that have ingredients of atovaquone; proguanil hydrochloride:

Atrial fibrillation/flutter and drugs with ingredients of atovaquone; proguanil hydrochloride (15 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 Malarone:

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 Atrial fibrillation/flutter:

Atrial fibrillation/flutter (2,362 drugs)

Browse all the conditions that are associated with Atrial fibrillation/flutter:

Atrial fibrillation/flutter (3,844 conditions)

How the study uses the data?

The study uses data from the FDA. It is based on atovaquone; proguanil hydrochloride (the active ingredients of Malarone) and Malarone (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.