Diphen and Keratitis - a phase IV clinical study of FDA data

Summary:

Keratitis is reported as a side effect among people who take Diphen (diphenhydramine hydrochloride), especially for people who are female, 60+ old, also take Cialis, and have Rheumatoid arthritis.

The phase IV clinical study analyzes which people have Keratitis when taking Diphen. It is created by eHealthMe based on reports of 113,958 people who have side effects when taking Diphen from the FDA, and is updated regularly.

What is Diphen?

Diphen has active ingredients of diphenhydramine hydrochloride. It is often used in insomnia. eHealthMe is studying from 115,429 Diphen users. Check the latest studies of Diphen.

What is Keratitis?

Keratitis (eye's cornea, the front part of the eye, becomes inflamed) is found to be associated with 476 drugs and 825 conditions by eHealthMe. Check the latest studies of Keratitis.

On Oct, 24, 2025

113,958 people reported to have side effects when taking Diphen.
Among them, 25 people (0.02%) have Keratitis.

Among these 25 people:

What is the gender of people who have Keratitis when taking Diphen? *

female: 94.74 %
male: 5.26 %

What is the age of people who have Keratitis when taking Diphen? *

What are other drugs people take besides Diphen? *

What are other side effects people have besides Keratitis? *

Lacrimation Increased: 23 people, 92.00%
Infusion Related Reaction: 22 people, 88.00%
Headache (pain in head): 22 people, 88.00%
Sinus Congestion (blockage of sinus): 22 people, 88.00%
Rhinitis (a medical term for irritation and inflammation of the mucous membrane inside the nose): 22 people, 88.00%
Renal Impairment (severely reduced kidney function): 22 people, 88.00%
Primary Pulmonary Hypertension (primary high blood pressure that affects the arteries in the lungs and the right side of your heart): 22 people, 88.00%
Oxygen Saturation Decreased: 22 people, 88.00%
Oropharyngeal Pain: 22 people, 88.00%
Blood Test Abnormal: 22 people, 88.00%

What are the existing conditions these people have? *

Rheumatoid Arthritis (a chronic progressive disease causing inflammation in the joints): 22 people, 88.00%
High Blood Pressure: 21 people, 84.00%
Weight Decreased: 2 people, 8.00%
Hypothyroidism (abnormally low activity of the thyroid gland, resulting in retardation of growth and mental development): 2 people, 8.00%
Asthma: 2 people, 8.00%
Breast Cancer Metastatic: 2 people, 8.00%
Dry Eyes (lack of adequate tears): 2 people, 8.00%
Dry Mouth: 2 people, 8.00%
High Blood Cholesterol: 2 people, 8.00%
Infection: 2 people, 8.00%

* Approximation only. Some reports may have incomplete information.

Do you take Diphen and have Keratitis?

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Related studies:

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

Diphen (115,429 reports)

Keratitis treatments and more:

Keratitis (4,119 reports)

Browse all side effects of Diphen:

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 Keratitis:

Keratitis (476 drugs)

Browse all the conditions that are associated with Keratitis:

Keratitis (825 conditions)

Drugs similar to Diphen and Keratitis :

How the study uses the data?

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