Allegra and Sleep disorder - a phase IV clinical study of FDA data

Summary:

Sleep disorder is reported as a side effect among people who take Allegra (fexofenadine hydrochloride), especially for people who are female, 60+ old, have been taking the drug for < 1 month also take Dupixent, and have Dermatitis atopic.

The phase IV clinical study analyzes which people have Sleep disorder when taking Allegra. It is created by eHealthMe based on reports of 73,095 people who have side effects when taking Allegra from the FDA, and is updated regularly.

What is Allegra?

Allegra has active ingredients of fexofenadine hydrochloride. It is often used in allergies. eHealthMe is studying from 75,496 Allegra users. Check the latest studies of Allegra.

What is Sleep disorder?

Sleep disorder is found to be associated with 2,112 drugs and 2,933 conditions by eHealthMe. Check the latest studies of Sleep disorder.

On Jan, 18, 2026

73,095 people reported to have side effects when taking Allegra.
Among them, 624 people (0.85%) have Sleep disorder.

Among these 624 people:

* Approximation only. Some reports may have incomplete information.

Do you take Allegra and have Sleep disorder?

- Check whether Sleep 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 Allegra:

Allegra (75,496 reports)

Sleep disorder treatments and more:

Sleep disorder (167,335 reports)

How severe was Sleep disorder and when was it recovered:

Sleep disorder in Allegra

Expand to all the drugs that have ingredients of fexofenadine hydrochloride:

Sleep disorder and drugs with ingredients of fexofenadine hydrochloride (796 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 Allegra:

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 Sleep disorder:

Sleep disorder (2,112 drugs)

Browse all the conditions that are associated with Sleep disorder:

Sleep disorder (2,933 conditions)

Related publications that referenced our studies

Lin SC, Su YC, Huang YS, Lee CC, "Zolpidem increased cancer risk in patients with sleep disorder: A 3-year follow-up study", Journal of Medical Sciences, 2016 Mar .
Lin SC, Su YC, Huang YS, Lee CC, "Zolpidem increased cancer risk in patients with sleep disorder: A 3-year follow-up study", Journal of Medical Sciences, 2016 Mar .

How the study uses the data?

The study uses data from the FDA. It is based on fexofenadine hydrochloride (the active ingredients of Allegra) and Allegra (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.