Euthyrox and Breast cancer - a phase IV clinical study of FDA data

Summary:

Breast cancer is reported as a side effect among people who take Euthyrox (levothyroxine sodium), especially for people who are female, 60+ old, have been taking the drug for 10+ years also take Femara, and have Post procedural hypothyroidism.

The phase IV clinical study analyzes which people have Breast cancer when taking Euthyrox. It is created by eHealthMe based on reports of 8,613 people who have side effects when taking Euthyrox from the FDA, and is updated regularly.

What is Euthyrox?

Euthyrox has active ingredients of levothyroxine sodium. It is often used in hypothyroidism. eHealthMe is studying from 8,740 Euthyrox users. Check the latest studies of Euthyrox.

What is Breast cancer?

Breast cancer is found to be associated with 1,296 drugs and 1,666 conditions by eHealthMe. Check the latest studies of Breast cancer.

On Jul, 27, 2026

8,613 people reported to have side effects when taking Euthyrox.
Among them, 34 people (0.39%) have Breast cancer.

Among these 34 people:

How long have people been on Euthyrox when they have Breast cancer? *

What is the gender of people who have Breast cancer when taking Euthyrox? *

female: 100 %
male: 0.0 %

What is the age of people who have Breast cancer when taking Euthyrox? *

What are other drugs people take besides Euthyrox? *

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

High Blood Pressure: 4 people, 11.76%
High Blood Cholesterol: 3 people, 8.82%
Malignant Neoplasm Progression (cancer tumour came back): 3 people, 8.82%
Fatigue (feeling of tiredness): 3 people, 8.82%
Depression: 3 people, 8.82%
Dyspnea (difficult or laboured breathing): 2 people, 5.88%
Skin Blushing/flushing (a sudden reddening of the face, neck): 2 people, 5.88%
Hair Loss: 2 people, 5.88%
Metastases To Liver (cancer spreads to liver): 2 people, 5.88%
Metastases To Spine (cancer spreads to spine): 2 people, 5.88%

What are the existing conditions these people have? *

Post Procedural Hypothyroidism: 8 people, 23.53%
High Blood Pressure: 4 people, 11.76%
Generalized Anxiety Disorder (excessive, uncontrollable, unexplained and often irrational worry): 3 people, 8.82%
Relapsing-Remitting Multiple Sclerosis (reoccurrence of an inflammatory disease in which the insulating covers of nerve cells in the brain and spinal cord are damaged): 2 people, 5.88%
Psoriatic Arthropathy (inflammation of the skin and joints with kin condition which typically causes patches (plaques) of red, scaly skin to develop): 2 people, 5.88%
Pain: 2 people, 5.88%
Multiple Sclerosis (a nervous system disease that affects your brain and spinal cord. it damages the myelin sheath): 2 people, 5.88%
Glaucoma (increased fluid pressure in the eye with vision loss): 2 people, 5.88%
Diabetes: 2 people, 5.88%
Crohn's Disease (a condition that causes inflammation of the gastrointestinal tract): 2 people, 5.88%

* Approximation only. Some reports may have incomplete information.

Do you take Euthyrox and have Breast cancer?

- Check whether Breast cancer 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 Euthyrox:

Euthyrox (8,740 reports)

Breast cancer treatments and more:

Breast cancer (266,434 reports)

Browse all side effects of Euthyrox:

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 cancer:

Breast cancer (1,296 drugs)

Browse all the conditions that are associated with Breast cancer:

Breast cancer (1,666 conditions)

How the study uses the data?

The study uses data from the FDA. It is based on levothyroxine sodium (the active ingredients of Euthyrox) and Euthyrox (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.