Allegra and Thyroid function test abnormal - a phase IV clinical study of FDA data

Summary:

Thyroid function test abnormal 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 Synthroid, and have High blood pressure.

The phase IV clinical study analyzes which people have Thyroid function test abnormal 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 75,492 Allegra users. Check the latest studies of Allegra.

What is Thyroid function test abnormal?

Thyroid function test abnormal is found to be associated with 1,710 drugs and 1,581 conditions by eHealthMe. Check the latest studies of Thyroid function test abnormal.

On Sep, 02, 2025

73,095 people reported to have side effects when taking Allegra.
Among them, 133 people (0.18%) have Thyroid function test abnormal.

Could Allegra cause Thyroid function test abnormal?

Among these 133 people:

How long have people been on Allegra when they have Thyroid function test abnormal? *

What is the gender of people who have Thyroid function test abnormal when taking Allegra? *

female: 82.17 %
male: 17.83 %

What is the age of people who have Thyroid function test abnormal when taking Allegra? *

What are other drugs people take besides Allegra? *

What are other side effects people have besides Thyroid function test abnormal? *

Dyspnea (difficult or laboured breathing): 37 people, 27.82%
Fatigue (feeling of tiredness): 35 people, 26.32%
High Blood Pressure: 34 people, 25.56%
Malaise (a feeling of general discomfort or uneasiness): 26 people, 19.55%
Stress And Anxiety: 23 people, 17.29%
Headache (pain in head): 23 people, 17.29%
Dizziness: 22 people, 16.54%
Pain: 22 people, 16.54%
Sinusitis (inflammation of sinus): 21 people, 15.79%
Diarrhea: 20 people, 15.04%

What are the existing conditions these people have? *

High Blood Pressure: 22 people, 16.54%
High Blood Cholesterol: 15 people, 11.28%
Hypersensitivity: 14 people, 10.53%
Multiple Sclerosis (a nervous system disease that affects your brain and spinal cord. it damages the myelin sheath): 12 people, 9.02%
Asthma: 11 people, 8.27%
Sleep Disorder: 10 people, 7.52%
Depression: 9 people, 6.77%
Arthritis (form of joint disorder that involves inflammation of one or more joints): 8 people, 6.02%
Narcolepsy (brain's inability to regulate sleep-wake cycles normally): 8 people, 6.02%
Cardiac Disorder: 8 people, 6.02%

* Approximation only. Some reports may have incomplete information.

Do you take Allegra and have Thyroid function test abnormal?

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Related studies:

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

Allegra (75,492 reports)

Common Allegra side effects:

Browse all side effects of Allegra:

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Common drugs associated with Thyroid function test abnormal:

Browse all the drugs that are associated with Thyroid function test abnormal:

Thyroid function test abnormal (1,710 drugs)

Common conditions associated with Thyroid function test abnormal:

Browse all the conditions that are associated with Thyroid function test abnormal:

Thyroid function test abnormal (1,581 conditions)

Drugs similar to Allegra and Thyroid function test abnormal :

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.