Benadryl and Haematocrit increased - a phase IV clinical study of FDA data
Summary:
Haematocrit increased is reported as a side effect among people who take Benadryl (diphenhydramine hydrochloride), especially for people who are male, 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 Haematocrit increased 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 Haematocrit increased?
Haematocrit increased is found to be associated with 402 drugs and 748 conditions by eHealthMe. Check the latest studies of Haematocrit increased.
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 >>>.
100,139 people reported to have side effects when taking Benadryl.
Among them, 101 people (0.1%) have Haematocrit increased.

Among these 101 people:
How long have people been on Benadryl when they have Haematocrit increased? *
What is the gender of people who have Haematocrit increased when taking Benadryl? *
What is the age of people who have Haematocrit increased when taking Benadryl? *
What are other drugs people take besides Benadryl? *
What are other side effects people have besides Haematocrit increased? *
What are the existing conditions these people have? *
* Approximation only. Some reports may have incomplete information.
Do you take Benadryl and have Haematocrit increased?
- Check whether Haematocrit increased 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 (104,955 reports)
Haematocrit increased treatments and more:
- Haematocrit increased (3,120 reports)
How severe was Haematocrit increased and when was it recovered:
Expand to all the drugs that have ingredients of diphenhydramine hydrochloride:
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 zBrowse all the drugs that are associated with Haematocrit increased:
- Haematocrit increased (402 drugs)
Browse all the conditions that are associated with Haematocrit increased:
- Haematocrit increased (748 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.
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