Benadryl and Immune system disorder - a phase IV clinical study of FDA data

Summary:

Immune system disorder is reported as a side effect among people who take Benadryl (diphenhydramine hydrochloride), especially for people who are female, 40-49 old, have been taking the drug for < 1 month also take Xolair, and have Asthma.

The phase IV clinical study analyzes which people have Immune system disorder when taking Benadryl. It is created by eHealthMe based on reports of 100,139 people who have side effects when taking Benadryl from the FDA, and is updated regularly.

What is Benadryl?

Benadryl has active ingredients of diphenhydramine hydrochloride. It is often used in allergies. eHealthMe is studying from 104,956 Benadryl users. Check the latest studies of Benadryl.

What is Immune system disorder?

Immune system disorder is found to be associated with 905 drugs and 1,038 conditions by eHealthMe. Check the latest studies of Immune system disorder.

eHealthMe: drug outcomes in the real world

eHealthMe runs one of the largest post-marketing drug safety studies in the world. We study millions of patients and 5,000 more each day. Our data-driven phase IV clinical trials have been referenced on 800+ peer-reviewed medical publications including The Lancet, Mayo Clinic Proceedings, and Nature. Tools to study our phase IV findings are available to the public, anonymous and free >>>.

On Aug, 31, 2026

100,139 people reported to have side effects when taking Benadryl.
Among them, 188 people (0.19%) have Immune system disorder.

Could Benadryl cause Immune system disorder?

Among these 188 people:

How long have people been on Benadryl when they have Immune system disorder? *

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What is the gender of people who have Immune system disorder when taking Benadryl? *

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What is the age of people who have Immune system disorder when taking Benadryl? *

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* Approximation only. Some reports may have incomplete information.

Do you take Benadryl and have Immune system disorder?

- Check whether Immune system 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 Benadryl:

Benadryl (104,956 reports)

Immune system disorder treatments and more:

Immune system disorder (21,480 reports)

How severe was Immune system disorder and when was it recovered:

Immune system disorder in Benadryl

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

Immune system disorder and drugs with ingredients of diphenhydramine hydrochloride (366 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 Benadryl:

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 Immune system disorder:

Immune system disorder (905 drugs)

Browse all the conditions that are associated with Immune system disorder:

Immune system disorder (1,038 conditions)

How the study uses the data?

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