Benadryl and Pulmonary function test decreased - a phase IV clinical study of FDA data

Summary:

Pulmonary function test decreased is reported as a side effect among people who take Benadryl (diphenhydramine hydrochloride), especially for people who are female, 60+ old, also take Tylenol, and have Rheumatoid arthritis.

The phase IV clinical study analyzes which people have Pulmonary function test decreased 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 104,955 Benadryl users. Check the latest studies of Benadryl.

What is Pulmonary function test decreased?

Pulmonary function test decreased is found to be associated with 464 drugs and 501 conditions by eHealthMe. Check the latest studies of Pulmonary function test decreased.

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, 17, 2026

100,139 people reported to have side effects when taking Benadryl.
Among them, 54 people (0.05%) have Pulmonary function test decreased.

Could Benadryl cause Pulmonary function test decreased?

Among these 54 people:

What is the gender of people who have Pulmonary function test decreased when taking Benadryl? *

female: 68.18 %
male: 31.82 %

What is the age of people who have Pulmonary function test decreased when taking Benadryl? *

What are other drugs people take besides Benadryl? *

What are other side effects people have besides Pulmonary function test decreased? *

Dyspnea (difficult or laboured breathing): 32 people, 59.26%
Joint Pain: 30 people, 55.56%
Oxygen Saturation Decreased: 27 people, 50.00%
Blood Pressure Systolic Increased: 24 people, 44.44%
High Blood Pressure: 24 people, 44.44%
Hypotension (abnormally low blood pressure): 23 people, 42.59%
Cough: 23 people, 42.59%
Infusion Related Reaction: 23 people, 42.59%
Pain In Extremity: 21 people, 38.89%
Blood Pressure Diastolic Abnormal: 20 people, 37.04%

What are the existing conditions these people have? *

Rheumatoid Arthritis (a chronic progressive disease causing inflammation in the joints): 24 people, 44.44%
Arrhythmias (irregular heartbeat): 11 people, 20.37%
Asthma: 7 people, 12.96%
Urination - Excessive Volume: 5 people, 9.26%
Polyneuropathy (neurological disorder that occurs when many peripheral nerves throughout the body malfunction simultaneously): 4 people, 7.41%
Cystic Fibrosis (disease of the secretary glands): 4 people, 7.41%
Multifocal Motor Neuropathy (a progressively worsening condition where muscles in the extremities gradually weaken): 4 people, 7.41%
Pemphigus (any of several acute or chronic skin diseases characterized by groups of itching blisters): 3 people, 5.56%
Micturition Urgency (urgency to pass the urine): 3 people, 5.56%
High Blood Pressure: 3 people, 5.56%

* Approximation only. Some reports may have incomplete information.

Do you take Benadryl and have Pulmonary function test decreased?

- Check whether Pulmonary function test decreased is associated with a drug or a condition
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Related studies:

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

Benadryl (104,955 reports)

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 Pulmonary function test decreased:

Pulmonary function test decreased (464 drugs)

Browse all the conditions that are associated with Pulmonary function test decreased:

Pulmonary function test decreased (501 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.