Breastfeeding Mothers Needed for a Research Study

Why are we doing this research?

Cincinnati Children’s is conducting a research study, sometimes known as a clinical trial or clinical study, to find out how long the drug hydroxyurea stays in the body and how it is passed into breastmilk when given to lactating women. 

We also want to determine if the amount of hydroxyurea passed into the breastmilk is safe to infants of breastfeeding women who have sickle cell disease (SCD).

Who can participate?

Breastfeeding mothers who are 18 years and older may be eligible for participation.


  • Pregnancy
  • Healthy Babies Children and Teens
  • Healthy Adults

What will happen in the study?

If you qualify for this study and agree to participate, you will have 2 study visits. You will be in this study for 2 days.

The following is a list of procedures that may take place during the study visit:

Questions about your general medical health (initial evaluation)

  • Hydroxyurea therapy
  • Blood samples
  • Urine samples
  • Urine pregnancy test
  • Breastmilk samples

You will first have an initial evaluation. During the evaluation, study staff will ask you questions about your general health and medical history.

After the initial evaluation, you will begin the hydroxyurea therapy part of the study.

You will be given 1 dose of hydroxyurea. If this is your first ever dose of hydroxyurea, and you have not already been prescribed hydroxyurea, you will be asked to not directly breastfeed your baby and to discard all pumped breast milk for 10 hours after you receive the dose of hydroxyurea. You will feed your baby previously pumped breast milk, before the dose, or other nutrition during this time. 

Blood samples, urine samples and breastmilk samples will all be collected at various time points throughout your study visit (from before you take the dose of hydroxyurea to up to 24 hours after you take the dose of hydroxyurea).

Study staff will monitor you for the development of side effects throughout the day of your study visit and for 1 day after your visit when you return to clinic and give another sample of urine, blood, and breastmilk.

Clinical data, including the results of standard lab tests, may be collected from your medical record. Access to all identifying and clinical information will be restricted to only the study doctor of this research study and his designees. This data will be stored in a secure database at Cincinnati Children’s. 

You as a participant will be given a consent form that thoroughly explains all of the details of the study. The form covers all of the procedures, the risks, the benefits, the pay, who to contact with questions or concerns and more. A member of the study staff will review the consent form with you and will be sure that all of your questions are answered.

What are the good things that can happen from this research?

Being in this study may not help you right now. When we finish the study, we hope we will improve our understanding of how the body handles hydroxyurea when given to lactating women. This may help other mothers and children later on.

What are the bad things that can happen from this research?

A detailed list of possible side effects will be provided to those participants interested in knowing more about this study.

Will you/your child be paid to be in this research study?

Participants may receive up to $150 for their time and effort.


Contact Us.Megan Reynolds

Cincinnati Children’s Hospital Medical Center
Cancer and Blood Diseases Institute
3333 Burnet Avenue
Cincinnati, OH 45229-3039

Study Doctor

Contact Us.Russell E. Ware, MD, PhD
Marjory J. Johnson Chair of Hematology Translational Research
Director, Division of Hematology
Co-Executive Director, Cancer and Blood Diseases Institute
Associate Director, Global Health Center
Cincinnati Children’s Hospital Medical Center