Hydrea Side Effects

Generic Name: hydroxyurea

Note: This page contains information about the side effects of hydroxyurea. Some of the dosage forms included on this document may not apply to the brand name Hydrea.

Not all side effects for Hydrea may be reported. You should always consult a doctor or healthcare professional for medical advice. Side effects can be reported to the FDA here.

For the Consumer

Applies to hydroxyurea: oral capsule, oral tablet

In addition to its needed effects, some unwanted effects may be caused by hydroxyurea (the active ingredient contained in Hydrea). In the event that any of these side effects do occur, they may require medical attention.

You should check with your doctor immediately if any of these side effects occur when taking hydroxyurea:

More common
  • Cough or hoarseness
  • fever or chills
  • lower back or side pain
  • painful or difficult urination
Less common
  • Black, tarry stools
  • blackening of the fingernails and toenails
  • blood in the urine or stools
  • pinpoint red spots on the skin
  • sores in the mouth and on the lips
  • unusual bleeding or bruising
Rare
  • Confusion
  • convulsions (seizures)
  • difficulty with urination
  • dizziness
  • headache
  • joint pain
  • seeing, hearing, or feeling things that are not there
  • swelling of the feet or lower legs
Incidence not known
  • Bleeding under the skin
  • blisters on the skin
  • bluish or pale color on the skin of the fingers or toes
  • coldness of the fingers or toes
  • crater-like lesions on the skin
  • itching skin
  • numbness or tingling of the fingers or toes
  • pain in the fingers or toes
  • unusual tiredness or weakness
  • weight loss

If any of the following symptoms of overdose occur while taking hydroxyurea, get emergency help immediately:

Symptoms of overdose
  • Scaling of the skin on the hands and feet
  • severe darkening of skin color
  • soreness
  • sores in the mouth and on the lips
  • swelling of the palms and soles of the feet
  • violet flushing of the skin

Some of the side effects that can occur with hydroxyurea may not need medical attention. As your body adjusts to the medicine during treatment these side effects may go away. Your health care professional may also be able to tell you about ways to reduce or prevent some of these side effects. If any of the following side effects continue, are bothersome or if you have any questions about them, check with your health care professional:

More common
  • Diarrhea
  • drowsiness
  • loss of appetite
  • nausea or vomiting
Less common
  • Constipation
  • redness of skin at the place of irradiation
  • skin rash and itching

For Healthcare Professionals

Applies to hydroxyurea: compounding powder, oral capsule, oral tablet

Hematologic

Hematologic side effects have been the most common reported and have included neutropenia, and very low reticulocyte and platelet levels, which required discontinuation of therapy. Elevated mean corpuscular volume of red cells have also been reported.

Hematologic recovery usually occurred within two weeks.

Gastrointestinal

Gastrointestinal side effects have included stomatitis, anorexia, nausea, vomiting, diarrhea, and constipation. Both fatal and nonfatal pancreatitis have been reported in HIV-infected patients who received hydroxyurea (the active ingredient contained in Hydrea) in combination with antiretroviral agents.

Other

Vasculitic toxicities were reported most often in patients with a history of, or currently receiving, interferon therapy.

Other side effects have included cutaneous vasculitic toxicities such as vasculitic ulcerations and gangrene, which have occurred in patients with myeloproliferative disorders during therapy with hydroxyurea.

Dermatologic

Dermatologic side effects including maculopapular rash, skin ulceration, dermatomyositis-like skin changes, peripheral erythema, squamous dysplasia, nail pigmentation, and facial erythema have been reported. In patients who have received several years of long-term daily maintenance therapy, hyperpigmentation, atrophy of skin and nails, scaling and violet papules have been reported. Alopecia has been reported very rarely. A case of transverse melanonychia has also been reported.

Oncologic

Oncologic side effects have included skin cancer. Use of hydroxyurea (the active ingredient contained in Hydrea) has been mutagenic, clastogenic, and cause cellular transformation to a tumorigenic phenotype. The drug has been reported to be unequivocally genotoxic and a presumed transspecies carcinogen, which implies a carcinogenic risk to humans.

Genitourinary

Genitourinary side effects have been reported to occasionally include a temporary impairment of renal tubular function accompanied by elevations in serum uric acid, BUN, and creatinine levels. Dysuria has been reported very rarely.

General

General side effects have included fever, chills, malaise, edema, asthenia, and moderate drowsiness following large doses.

Nervous system

Nervous system side effects including headache, dizziness, disorientation, hallucinations, and convulsions have been reported very rarely. Severe peripheral neuropathy has been reported in HIV-infected patients who received hydroxyurea (the active ingredient contained in Hydrea) in combination with antiretroviral agents.

Hepatic

Hepatic side effects have included elevation of hepatic enzymes. Both fatal and nonfatal hepatotoxicity have been reported in HIV-infected patients who received hydroxyurea (the active ingredient contained in Hydrea) in combination with 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.

Respiratory

Respiratory side effects have rarely included the development of acute pulmonary infiltrates, fever, dyspnea, and pulmonary fibrosis.

Metabolic

Metabolic side effects including two cases of tumor lysis syndrome have been reported.

Disclaimer: Every effort has been made to ensure that the information provided is accurate, up-to-date and complete, but no guarantee is made to that effect. In addition, the drug information contained herein may be time sensitive and should not be utilized as a reference resource beyond the date hereof. This material does not endorse drugs, diagnose patients, or recommend therapy. This information is a reference resource designed as supplement to, and not a substitute for, the expertise, skill , knowledge, and judgement of healthcare practitioners in patient care. The absence of a warning for a given drug or combination thereof in no way should be construed to indicate safety, effectiveness, or appropriateness for any given patient. Drugs.com does not assume any responsibility for any aspect of healthcare administered with the aid of materials provided. The information contained herein is not intended to cover all possible uses, directions, precautions, warnings, drug interactions, allergic reactions, or adverse effects. If you have questions about the substances you are taking, check with your doctor, nurse, or pharmacist.

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