Benadryl and Nitrite urine present - a phase IV clinical study of FDA data

Summary:

Nitrite urine present is reported as a side effect among people who take Benadryl (diphenhydramine hydrochloride), especially for people who are female, 30-39 old, have been taking the drug for < 1 month also take Gravol, and have Relapsing-remitting multiple sclerosis.

The phase IV clinical study analyzes which people have Nitrite urine present 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 Nitrite urine present?

Nitrite urine present (nitrite in urine) is found to be associated with 85 drugs and 204 conditions by eHealthMe. Check the latest studies of Nitrite urine present.

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 Sep, 02, 2026

100,139 people reported to have side effects when taking Benadryl.
Among them, 72 people (0.07%) have Nitrite urine present.

Could Benadryl cause Nitrite urine present?

Among these 72 people:

How long have people been on Benadryl when they have Nitrite urine present? *

What is the gender of people who have Nitrite urine present when taking Benadryl? *

female: 93.85 %
male: 6.15 %

What is the age of people who have Nitrite urine present when taking Benadryl? *

What are other drugs people take besides Benadryl? *

Gravol: 45 people, 62.50%
Cimetidine: 29 people, 40.28%
Tylenol: 25 people, 34.72%
Acyclovir: 17 people, 23.61%
Ativan: 16 people, 22.22%
Paracetamol: 16 people, 22.22%
Acetaminophen: 16 people, 22.22%
Methylprednisolone Sodium Succinate: 14 people, 19.44%
Cyanocobalamin: 13 people, 18.06%
Lemtrada: 10 people, 13.89%

What are other side effects people have besides Nitrite urine present? *

Lymphocyte Count Decreased: 64 people, 88.89%
Urine Abnormality: 62 people, 86.11%
Headache (pain in head): 55 people, 76.39%
Blood Urine Present: 50 people, 69.44%
Fatigue (feeling of tiredness): 46 people, 63.89%
Urinary Tract Infection: 42 people, 58.33%
Protein Urine Present: 40 people, 55.56%
Culture Urine Positive: 37 people, 51.39%
White Blood Cells Urine Positive: 36 people, 50.00%
Nausea (feeling of having an urge to vomit): 35 people, 48.61%

What are the existing conditions these people have? *

Relapsing-Remitting Multiple Sclerosis (reoccurrence of an inflammatory disease in which the insulating covers of nerve cells in the brain and spinal cord are damaged): 62 people, 86.11%
Sleep Disorder: 24 people, 33.33%
Fatigue (feeling of tiredness): 13 people, 18.06%
Vasculitis (inflammation of a blood vessel or blood vessels): 5 people, 6.94%
Muscle Spasms (muscle contraction): 5 people, 6.94%
Birth Control: 5 people, 6.94%
Microscopic Polyangiitis (inflammation involving multiple blood or lymph small-vessel): 5 people, 6.94%
Pain: 4 people, 5.56%
Diabetes: 4 people, 5.56%
Pain In Extremity: 3 people, 4.17%

* Approximation only. Some reports may have incomplete information.

Do you take Benadryl and have Nitrite urine present?

- Check whether Nitrite urine present is associated with a drug or a condition
- Predict drug outcomes for up to one year with AI
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Related studies:

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

Benadryl (104,956 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 Nitrite urine present:

Nitrite urine present (85 drugs)

Browse all the conditions that are associated with Nitrite urine present:

Nitrite urine present (204 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.