Droxia and Hydrea (hydroxyurea) capsules

Detailed View: Safety Labeling Changes Approved By FDA Center for Drug Evaluation and Research (CDER)  

March 2016

Summary View


Embryo-Fetal Toxicity
  • Based on the mechanism of action and findings in animals, HYDREA/DROXIA can cause fetal harm when administered to a pregnant woman. Hydroxyurea was embryotoxic and teratogenic in rats and rabbits at doses 0.8 times and 0.3 times, respectively, the maximum recommended human daily dose on a mg/m2 basis. Advise pregnant women of the potential risk to a fetus
  • Advise females of reproductive potential to use effective contraception during and after treatment with HYDREA for at least 6 months after therapy. Advise males of reproductive potential to use effective contraception during and after treatment with HYDREA for at least 1 year after therapy.
Live Vaccinations
  • Avoid use of live vaccine in patients taking HYDREA. Concomitant use of Hydrea/Droxia with a live virus vaccine may potentiate the replication of the virus and/or may increase the adverse reaction of the vaccine because normal defense mechanisms may be suppressed by HYDREA/DROXIA. Vaccination with live vaccines in a patient receiving HYDREA/DROXIA may result in severe infection. Patient’s antibody response to vaccines may be decreased. Consider consultation with a specialist.


Postmarketing Experience

Reproductive System and Breast disorders: azoospermia, and oligospermia

  • Metabolism and Nutrition disorders: anorexia, tumor lysis syndrome

Hepatobiliary disorders: cholestasis, and hepatitis

  • Adverse reactions observed with combined hydroxyurea and irradiation therapy are similar to those reported with the use of hydroxyurea or radiation treatment alone. These effects primarily include bone marrow depression (anemia and leukopenia), gastric irritation, and mucositis. Almost all patients receiving an adequate course of combined hydroxyurea and irradiation therapy will demonstrate concurrent leukopenia. Platelet depression (<100,000 cells/mm3) has occurred in the presence of marked leukopenia. HYDREA may potentiate some adverse reactions usually seen with irradiation alone, such as gastric distress and mucositis.


January 2012

Summary View


Drug Interactions
  • Studies have shown that there is an analytical interference of hydroxyurea with the enzymes (urease, uricase, and lactate dehydrogenase) used in the determination of urea, uric acid and lactic acid, rendering falsely elevated results of these in patients treated with hydroxyurea.


May 2010

Summary View 


  • Hepatotoxicity and hepatic failure resulting in death have been reported during post-marketing surveillance in HIV-infected patients treated with hydroxyurea and other antiretroviral agents. Fatal hepatic events were reported most often in patients treated with the combination of hydroxyurea, didanosine, and stavudine. This combination should be avoided.


  • An increased risk of hepatotoxicity, which may be fatal, may occur in patients treated with hydroxyurea, and in particular, in combination with didanosine and stavudine. This combination should be avoided.


Page Last Updated: 04/15/2016
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