Efudex and Hair color changes - a phase IV clinical study of FDA data

Summary:

Hair color changes is reported as a side effect among people who take Efudex (fluorouracil), especially for people who are female, 50-59 old, have been taking the drug for 1 - 6 months also take Neosar, and have Breast cancer female.

The phase IV clinical study analyzes which people have Hair color changes when taking Efudex. It is created by eHealthMe based on reports of 1,332 people who have side effects when taking Efudex from the FDA, and is updated regularly.

What is Efudex?

Efudex has active ingredients of fluorouracil. It is often used in actinic keratosis. eHealthMe is studying from 1,391 Efudex users. Check the latest studies of Efudex.

What is Hair color changes?

Hair color changes is found to be associated with 656 drugs and 637 conditions by eHealthMe. Check the latest studies of Hair color changes.

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, 25, 2026

1,332 people reported to have side effects when taking Efudex.
Among them, 134 people (10.06%) have Hair color changes.

Among these 134 people:

* Approximation only. Some reports may have incomplete information.

Do you take Efudex and have Hair color changes?

- Check whether Hair color changes 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 Efudex:

Efudex (1,391 reports)

Hair color changes treatments and more:

Hair color changes (17,909 reports)

How severe was Hair color changes and when was it recovered:

Hair color changes in Efudex

Expand to all the drugs that have ingredients of fluorouracil:

Hair color changes and drugs with ingredients of fluorouracil (162 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 Efudex:

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 Hair color changes:

Hair color changes (656 drugs)

Browse all the conditions that are associated with Hair color changes:

Hair color changes (637 conditions)

How the study uses the data?

The study uses data from the FDA. It is based on fluorouracil (the active ingredients of Efudex) and Efudex (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.