Hydrea and Red blood cell count increased - a phase IV clinical study of FDA data

Summary:

Red blood cell count increased is reported as a side effect among people who take Hydrea (hydroxyurea), especially for people who are female, 60+ old, also take Jakafi, and have Polycythaemia vera.

The phase IV clinical study analyzes which people have Red blood cell count increased when taking Hydrea. It is created by eHealthMe based on reports of 8,922 people who have side effects when taking Hydrea from the FDA, and is updated regularly.

What is Hydrea?

Hydrea has active ingredients of hydroxyurea. It is often used in polycythemia vera. eHealthMe is studying from 9,083 Hydrea users. Check the latest studies of Hydrea.

What is Red blood cell count increased?

Red blood cell count increased is found to be associated with 428 drugs and 588 conditions by eHealthMe. Check the latest studies of Red blood cell count 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 >>>.

On Sep, 01, 2026

8,922 people reported to have side effects when taking Hydrea.
Among them, 22 people (0.25%) have Red blood cell count increased.

Could Hydrea cause Red blood cell count increased?

Among these 22 people:

What is the gender of people who have Red blood cell count increased when taking Hydrea? *

female: 61.54 %
male: 38.46 %

What is the age of people who have Red blood cell count increased when taking Hydrea? *

What are other drugs people take besides Hydrea? *

What are other side effects people have besides Red blood cell count increased? *

Platelet Count Increased: 13 people, 59.09%
White Blood Cell Count Increased: 10 people, 45.45%
Haematocrit Increased: 9 people, 40.91%
Haemoglobin Increased: 7 people, 31.82%
Itching: 5 people, 22.73%
Blood Lactate Dehydrogenase Increased: 3 people, 13.64%
Fever: 3 people, 13.64%
Enlarged Heart: 3 people, 13.64%
Rashes (redness): 3 people, 13.64%
Splenomegaly (enlargement of spleen): 3 people, 13.64%

What are the existing conditions these people have? *

Polycythaemia Vera (blood disorder in which the bone marrow makes too many red blood cells): 8 people, 36.36%
Thrombocytosis: 3 people, 13.64%
Primary Myelofibrosis (primary disorder of the bone marrow): 2 people, 9.09%
Lung Disorder (lung disease): 2 people, 9.09%
Hypothyroidism (abnormally low activity of the thyroid gland, resulting in retardation of growth and mental development): 2 people, 9.09%
High Blood Pressure: 2 people, 9.09%
High Blood Cholesterol: 2 people, 9.09%
Facial Paralysis (loss of function of face muscle): 2 people, 9.09%
Enlarged Prostate: 2 people, 9.09%
Diabetes: 2 people, 9.09%

* Approximation only. Some reports may have incomplete information.

Do you take Hydrea and have Red blood cell count increased?

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Related studies:

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

Hydrea (9,083 reports)

Browse all side effects of Hydrea:

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 Red blood cell count increased:

Red blood cell count increased (428 drugs)

Browse all the conditions that are associated with Red blood cell count increased:

Red blood cell count increased (588 conditions)

How the study uses the data?

The study uses data from the FDA. It is based on hydroxyurea (the active ingredients of Hydrea) and Hydrea (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.