Synthroid and Cfa - a phase IV clinical study of FDA data

Summary:

Cfa is reported as a side effect among people who take Synthroid (levothyroxine sodium), especially for people who are female, 60+ old, have been taking the drug for 1 - 6 months also take Acetaminophen, and have Rheumatoid arthritis.

The phase IV clinical study analyzes which people have Cfa when taking Synthroid. It is created by eHealthMe based on reports of 237,758 people who have side effects when taking Synthroid from the FDA, and is updated regularly.

What is Synthroid?

Synthroid has active ingredients of levothyroxine sodium. It is often used in hypothyroidism. eHealthMe is studying from 249,189 Synthroid users. Check the latest studies of Synthroid.

What is Cfa?

Cfa is found to be associated with 2,018 drugs and 2,245 conditions by eHealthMe. Check the latest studies of Cfa.

On Dec, 20, 2025

237,758 people reported to have side effects when taking Synthroid.
Among them, 752 people (0.32%) have Cfa.

Among these 752 people:

* Approximation only. Some reports may have incomplete information.

Do you take Synthroid and have Cfa?

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Related studies:

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

Synthroid (249,189 reports)

Cfa treatments and more:

Cfa (79,193 reports)

How severe was Cfa and when was it recovered:

Cfa in Synthroid

Expand to all the drugs that have ingredients of levothyroxine sodium:

Cfa and drugs with ingredients of levothyroxine sodium (1,611 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 Synthroid:

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

Common drugs associated with Cfa:

Methotrexate side effect: Cfa (4,714 reports)
Prednisone side effect: Cfa (4,117 reports)
Humira side effect: Cfa (2,869 reports)
Enbrel side effect: Cfa (2,842 reports)
Ofev side effect: Cfa (2,063 reports)
Remicade side effect: Cfa (2,043 reports)
Actemra side effect: Cfa (2,024 reports)
Leflunomide side effect: Cfa (1,957 reports)
Xeljanz side effect: Cfa (1,940 reports)
Pantoprazole side effect: Cfa (1,758 reports)

Browse all the drugs that are associated with Cfa:

Cfa (2,018 drugs)

Common conditions associated with Cfa:

Rheumatoid arthritis aggravated: 5,843 reports
Ipf: 2,256 reports
Atrial fibrillation: 1,089 reports
Hypertension: 1,023 reports
Blood pressure increased: 1,015 reports
Psoriatic arthropathy: 851 reports
Cfa: 843 reports
Sporadic primary pulmonary hypertension: 793 reports
Psoriasis aggravated: 789 reports
Osteoporosis: 682 reports

Browse all the conditions that are associated with Cfa:

Cfa (2,245 conditions)

Drugs similar to Synthroid and Cfa :

How the study uses the data?

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