Hydrea (Hydroxycarbamide)

Hydrea is prescribed for specific blood disorders where controlling abnormal cell proliferation is essential. It is used in both adult and pediatric patients under medical supervision.

• Management of sickle cell disease to reduce painful crises.
• Treatment of chronic myelogenous leukemia (CML) as part of disease control.
• Therapy for polycythemia vera to lower elevated red blood cell counts.
• Management of essential thrombocythemia to decrease platelet production.
• Off‑label use in certain myeloproliferative neoplasms as determined by a specialist.

• Hydroxycarbamide inhibits the enzyme ribonucleotide reductase, which is critical for converting ribonucleotides to deoxyribonucleotides. By reducing the pool of deoxyribonucleotides, the drug limits DNA synthesis and cell replication, particularly affecting rapidly dividing hematopoietic cells. This antimetabolite action leads to decreased production of abnormal blood cells in conditions such as sickle cell disease and myeloproliferative disorders.

Hydrea may cause a range of adverse reactions, varying from mild to severe. Patients should be monitored regularly for any signs of toxicity.

Common

• Nausea or vomiting, often mild to moderate in intensity.
• Fatigue or general weakness that may affect daily activities.
• Mild hair thinning or temporary loss of scalp hair.
• Skin discoloration or hyperpigmentation, especially on the hands.

Serious

• Severe bone marrow suppression leading to anemia, neutropenia, or thrombocytopenia.
• Acute renal impairment manifested by reduced urine output.
• Pulmonary toxicity presenting as shortness of breath or cough.
• Severe gastrointestinal ulceration or bleeding.
• Life‑threatening allergic reactions such as anaphylaxis.

Before starting Hydrea, several safety considerations should be addressed to minimize risk.

• Baseline complete blood count and renal function tests are required.
• Avoid use in patients with known hypersensitivity to hydroxycarbamide.
• Monitor for signs of infection due to possible neutropenia.
• Use caution in pregnant or breastfeeding women; the safety profile is not well established.
• Adjust dose in patients with pre‑existing kidney disease.
• Regular ophthalmologic examinations are advised for long‑term therapy.

Hydrea can interact with other medications, altering its effectiveness or increasing toxicity.

Avoid

• Concurrent use with other myelosuppressive agents such as azacitidine, which may exacerbate bone marrow suppression.
• Co‑administration with high‑dose vitamin C supplements, which can increase oxidative stress.
• Use with strong CYP450 inducers that may reduce hydroxycarbamide plasma levels.

Use with caution

• Anticoagulants (e.g., warfarin) as Hydrea may affect platelet counts and bleeding risk.
• Allopurinol, which can increase the risk of hypersensitivity reactions.
• NSAIDs, which may worsen renal impairment when combined with Hydrea.