Letrozole and Obstruction - a phase IV clinical study of FDA data

Summary:

Obstruction is reported as a side effect among people who take Letrozole (letrozole), especially for people who are female, 60+ old, also take Tylenol, and have Asthma.

The phase IV clinical study analyzes which people have Obstruction when taking Letrozole. It is created by eHealthMe based on reports of 53,470 people who have side effects when taking Letrozole from the FDA, and is updated regularly.

What is Letrozole?

Letrozole has active ingredients of letrozole. It is often used in breast cancer. eHealthMe is studying from 54,123 Letrozole users. Check the latest studies of Letrozole.

What is Obstruction?

Obstruction is found to be associated with 524 drugs and 628 conditions by eHealthMe. Check the latest studies of Obstruction.

On Feb, 15, 2026

53,470 people reported to have side effects when taking Letrozole.
Among them, 94 people (0.18%) have Obstruction.

Among these 94 people:

* Approximation only. Some reports may have incomplete information.

Do you take Letrozole and have Obstruction?

- Check whether Obstruction 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 Letrozole:

Letrozole (54,123 reports)

Obstruction treatments and more:

Obstruction (4,654 reports)

How severe was Obstruction and when was it recovered:

Obstruction in Letrozole

Expand to all the drugs that have ingredients of letrozole:

Obstruction and drugs with ingredients of letrozole

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 Letrozole:

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 Obstruction:

Obstruction (524 drugs)

Browse all the conditions that are associated with Obstruction:

Obstruction (628 conditions)

How the study uses the data?

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