Avonex and Breast disorder - a phase IV clinical study of FDA data

Summary:

Breast disorder is reported as a side effect among people who take Avonex (interferon beta 1a), especially for people who are female, 50-59 old, have been taking the drug for 2 - 5 years also take Tysabri, and have Back pain.

The phase IV clinical study analyzes which people have Breast disorder when taking Avonex. It is created by eHealthMe based on reports of 198,141 people who have side effects when taking Avonex from the FDA, and is updated regularly.

What is Avonex?

Avonex has active ingredients of interferon beta 1a. It is often used in multiple sclerosis. eHealthMe is studying from 198,544 Avonex users. Check the latest studies of Avonex.

What is Breast disorder?

Breast disorder is found to be associated with 316 drugs and 421 conditions by eHealthMe. Check the latest studies of Breast disorder.

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 Sep, 03, 2026

198,141 people reported to have side effects when taking Avonex.
Among them, 24 people (0.01%) have Breast disorder.

Among these 24 people:

How long have people been on Avonex when they have Breast disorder? *

What is the gender of people who have Breast disorder when taking Avonex? *

female: 91.67 %
male: 8.33 %

What is the age of people who have Breast disorder when taking Avonex? *

What are other drugs people take besides Avonex? *

What are other side effects people have besides Breast disorder? *

Nausea (feeling of having an urge to vomit): 4 people, 16.67%
Body Height Decreased: 4 people, 16.67%
Diabetes: 4 people, 16.67%
Depression: 4 people, 16.67%
Fall: 4 people, 16.67%
Sinusitis (inflammation of sinus): 4 people, 16.67%
Nausea And Vomiting: 4 people, 16.67%
Pain In Extremity: 4 people, 16.67%
Influenza Like Illness: 4 people, 16.67%
Gastroesophageal Reflux Disease (a condition in which stomach contents leak backward from the stomach into the oesophagus): 4 people, 16.67%

What are the existing conditions these people have? *

Depression: 2 people, 8.33%
Back Pain: 2 people, 8.33%
Rheumatoid Arthritis (a chronic progressive disease causing inflammation in the joints): 1 person, 4.17%
Osteopenia (a condition where bone mineral density is lower than normal): 1 person, 4.17%
Diabetes: 1 person, 4.17%
Breast Cancer: 1 person, 4.17%

* Approximation only. Some reports may have incomplete information.

Do you take Avonex and have Breast disorder?

- Check whether Breast disorder 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 Avonex:

Avonex (198,544 reports)

Breast disorder treatments and more:

Breast disorder (3,176 reports)

Browse all side effects of Avonex:

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 Breast disorder:

Breast disorder (316 drugs)

Browse all the conditions that are associated with Breast disorder:

Breast disorder (421 conditions)

How the study uses the data?

The study uses data from the FDA. It is based on interferon beta 1a (the active ingredients of Avonex) and Avonex (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.