Top of the page
Common Brand Name(s): Hydrea
This is a summary and does NOT have all possible information about this product. This information does not assure that this product is safe, effective, or appropriate for you. This information is not individual medical advice and does not substitute for the advice of your health care professional. Always ask your health care professional for complete information about this product and your specific health needs.
This medication decreases bone marrow function, an effect that may lead to a low number of blood cells such as red cells, white cells, and platelets. This effect can cause anemia, decrease your body's ability to fight an infection, or cause easy bruising/bleeding. Tell your doctor right away if you develop any of the following symptoms: signs of infection (such as sore throat that doesn't go away, cough, fever, chills), easy bruising/bleeding, pale skin, unusual tiredness.
Hydroxyurea may cause other cancers (such as secondary leukemia, skin cancer). Protect your skin from the sun. Avoid prolonged sun exposure, tanning booths, and sunlamps. Use sunscreen and wear protective clothing when outdoors. Tell your doctor right away if you notice any symptoms of cancer, such as swollen glands, sudden weight loss, night sweats, or unusual skin growths/moles.
This medication is used by people with sickle cell anemia to reduce the number of painful crises caused by the disease and to reduce the need for blood transfusions. Some brands are also used to treat certain types of cancer (such as chronic myelogenous leukemia, squamous cell carcinomas).
This section contains uses of this drug that are not listed in the approved professional labeling for the drug but that may be prescribed by your health care professional. Use this drug for a condition that is listed in this section only if it has been so prescribed by your health care professional.
This drug may also be used for polycythemia vera or thrombocythemia.
Read the Medication Guide if available from your pharmacist before you start taking hydroxyurea and each time you get a refill. If you have any questions, ask your doctor or pharmacist.
Take this medication by mouth with or without food as directed by your doctor, usually once daily. The dosage is based on your weight, medical condition, lab results, and response to treatment. Your treatment may be stopped for a short time if your blood counts are too low. Keep all medical and lab appointments.
Do not increase your dose or use this drug more often or for longer than prescribed. Your condition will not improve any faster, and your risk of serious side effects will increase.
If you are using the capsules, swallow the them whole. Do not crush, chew, or open the capsules.
If you are using the tablets, swallow your dose with a glass of water. Only split a tablet if it has a score line and your doctor has instructed you to do so. If you have trouble swallowing, you may dissolve the whole or split tablet in a small amount of water in a teaspoon and swallow it right away.
Wash hands before and after handling the medication or its container. You and/or your caregiver should wear disposable gloves when handling this medication or its container. If powder from the tablet or capsule spills, wipe it up right away with a wet paper towel and throw away in a closed container such as a plastic bag. Clean the spill area right away with soap and water. Make sure not to breathe the powder from the tablets/capsules.
Since this drug can be absorbed through the skin and lungs, women who are pregnant or who may become pregnant should not handle this medication or breathe the dust from the tablets/capsules.
Tell your doctor if your condition does not get better or if it gets worse.
See also Warning Section.
Nausea, vomiting, loss of appetite, mouth sores, diarrhea, or constipation may occur. If any of these effects persist or worsen, tell your doctor or pharmacist promptly.
People using this medication may have serious side effects. However, you have been prescribed this drug because your doctor has judged that the benefit to you is greater than the risk of side effects. Careful monitoring by your doctor may decrease your risk.
Tell your doctor right away if you have any serious side effects, including:
Get medical help right away if you have any very serious side effects, including:
A very serious allergic reaction to this drug is rare. However, get medical help right away if you notice any symptoms of a serious allergic reaction, including:
This is not a complete list of possible side effects. If you notice other effects not listed above, contact your doctor or pharmacist.
In the US -
Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088 or at www.fda.gov/medwatch.
In Canada - Call your doctor for medical advice about side effects. You may report side effects to Health Canada at 1-866-234-2345.
See also Warning section.
Before taking hydroxyurea, tell your doctor or pharmacist if you are allergic to it; or if you have any other allergies. This product may contain inactive ingredients, which can cause allergic reactions or other problems. Talk to your pharmacist for more details.
Before using this medication, tell your doctor or pharmacist your medical history, especially of:
Hydroxyurea can make you more likely to get infections or may worsen any current infections. Avoid contact with people who have infections that may spread to others (such as chickenpox, measles, flu). Consult your doctor if you have been exposed to an infection or for more details.
Do not have immunizations/vaccinations without the consent of your doctor. Avoid contact with people who have recently received live vaccines (such as flu vaccine inhaled through the nose).
To lower the chance of getting cut, bruised, or injured, use caution with sharp objects like razors and nail cutters, and avoid activities such as contact sports.
Before having surgery, tell your doctor or dentist about all the products you use (including prescription drugs, nonprescription drugs, and herbal products).
Older adults may be more sensitive to the side effects of this drug.
It is unknown if this medication affects sperm. If you plan to father a child, discuss the risks and benefits of this medication with your doctor.
Tell your doctor if you are pregnant or plan to become pregnant. You should not become pregnant while using hydroxyurea. Hydroxyurea may harm an unborn baby. Men with female partners of childbearing age should ask about reliable forms of birth control while using this medication and for 1 year after stopping treatment. Women of childbearing age should ask about reliable forms of birth control while using this medication and for 6 months after stopping treatment. If you or your partner becomes pregnant or may be pregnant, tell your doctor right away.
Hydroxyurea passes into breast milk and may have undesirable effects on a nursing infant. Breast-feeding while using this drug is not recommended. Consult your doctor before breast-feeding.
Drug interactions may change how your medications work or increase your risk for serious side effects. This document does not contain all possible drug interactions. Keep a list of all the products you use (including prescription/nonprescription drugs and herbal products) and share it with your doctor and pharmacist. Do not start, stop, or change the dosage of any medicines without your doctor's approval.
Some products that may interact with this drug include:
This medication may interfere with certain laboratory tests, possibly causing false test results. Make sure laboratory personnel and all your doctors know you use this drug.
If someone has overdosed and has serious symptoms such as passing out or trouble breathing, call 911. Otherwise, call a poison control center right away. US residents can call their local poison control center at 1-800-222-1222. Alberta residents can call PADIS (Poison and Drug Information Service) 24 hours a day at 1-800-332-1414. Canada residents can call a provincial poison control center. Symptoms of overdose include: swelling/scaling of hands and feet.
Do not share this medication with others.
Lab and/or medical tests (such as complete blood count, kidney/liver function) must be done before you start taking this medication and while you are taking it. Keep all medical and lab appointments.
Your doctor may direct you to also take folic acid while you are taking hydroxyurea due to the risk of anemia. Ask your doctor for details.
If you miss a dose, take it as soon as you remember. If it is near the time of the next dose, skip the missed dose. Take your next dose at the regular time. Do not double the dose to catch up.
If you have questions about missing a dose or you don't have more medication, contact your healthcare provider or pharmacist.
Store at room temperature away from light and moisture. Do not store in the bathroom. Keep all medications away from children and pets.
Do not flush medications down the toilet or pour them into a drain unless instructed to do so. Properly discard this product when it is expired or no longer needed. Consult your pharmacist or local waste disposal company.
Information last revised August 2021.
Copyright(c) 2021 First Databank, Inc.
Conditions of use: The information in this database is intended to supplement, not substitute for the expertise and judgment of healthcare professionals. The information in not intend to cover all possible uses, directions, precautions, drug interactions or adverse effects nor should it be construed in indicate that use of a particular drug is safe, appropriate or effective for you or anyone else. A healthcare professional should be consulted before taking any drug, changing any diet or commencing or discontinuing any course of treatment.
Healthwise, Healthwise for every health decision, and the Healthwise logo are trademarks of Healthwise, Incorporated.