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Additional information about the drug Hydroxyurea


Hydroxycarbamide, also known as hydroxyurea, is a medication used in sickle-cell disease, chronic myelogenous leukemia, cervical cancer, and polycythemia vera.
Common side effects include bone marrow suppression, fevers, loss of appetite, psychiatric problems, shortness of breath, and headaches.
Hydroxycarbamide was approved for medical use in the United States in 1967.
Contents
1 Medical uses
2 Side effects
3 Mechanism of action
4 Names
5 Natural occurrence
6 Chemistry
7 Pharmacology
8 References
Medical uses
Hydroxycarbamide is used for the following indications:
Myeloproliferative disease (primarily polycythemia vera and essential thrombocythemia ). It has been found to be superior to anagrelide for the control of ET.
Sickle-cell disease (increases production of fetal hemoglobin that then reduces the tendency of sickle cells to sickle, as well as reducing white blood cells that contribute to the general inflammatory state in sickle cell patients.)
Second line treatment for psoriasis (slows down the rapid division of skin cells)
Psoriasis
Systemic mastocytosis
Chronic myelogenous leukemia (largely replaced by imatinib, but still in use for its cost-effectiveness)
Side effects
Reported side-effects are: drowsiness, nausea, vomiting and diarrhea, constipation, mucositis, anorexia, stomatitis, bone marrow toxicity (dose-limiting toxicity; may take 7–21 days to recover after the drug has been discontinued), alopecia (hair loss), skin changes, abnormal liver enzymes, creatinine and blood urea nitrogen.
Due to its negative effect on the bone marrow, regular monitoring of the full blood count is vital, as well as early response to possible infections. In addition, renal function, uric acid and electrolytes, as well as liver enzymes, are commonly checked. Moreover, because of this, severe anemia and neutropenia are contraindicated.
Hydroxycarbamide has been used primarily for the treatment of myeloproliferative diseases, which has an inherent risk of transforming to acute myeloid leukemia. There has been a longstanding concern that hydroxycarbamide itself carries a leukemia risk, but large studies have shown that the risk is either absent or very small. Nevertheless, it has been a barrier for its wider use in patients with sickle-cell disease.
Mechanism of action
Hydroxycarbamide decreases the production of deoxyribonucleotides
In the treatment of sickle-cell disease, hydroxycarbamide increases the concentration of fetal hemoglobin. The precise mechanism of action is not yet clear, but it appears that hydroxycarbamide increases nitric oxide levels, causing soluble guanylyl cyclase activation with a resultant rise in cyclic GMP, and the activation of gamma globin gene expression and subsequent gamma chain synthesis necessary for fetal hemoglobin (HbF) production (which does not polymerize and deform red blood cells like the mutated HbS, responsible for sickle cell disease). Adult red cells containing more than 1% HbF are termed F cells. These cells are progeny of a small pool of immature committed erythroid precursors (BFU-e) that retain the ability to produce HbF. Hydroxyurea also suppresses the production of granulocytes in the bone marrow which has a mild immunosuppressive effect particularly at vascular sites where sickle cells have occluded blood flow.
Names
Brand names include: Hydrea, Litalir, Droxia, and Siklos
Natural occurrence
Hydroxyurea has been reported as endogenous in human blood plasma at concentrations of approximately 30 to 200 ng/ml.
Chemistry
Hydroxyurea has been prepared in many different ways since its initial synthesis in 1869. Due to its chemical properties hydroxyurea was explored as an antisickling agent in the treatment of hematological conditions.
One common mechanism for synthesizing hydroxyurea is by the reaction of calcium cyanate with hydroxylamine nitrate in absolute ethanol and by the reaction of salt (i.e. sodium or potassium) cyanates and hydroxylamine hydrochloride in aqueous solution.
Pharmacology
Hydroxyurea is a monohydroxyl-substituted urea (hydroxycarbamate) antimetabolite. Similar to other antimetabolite anti-cancer drugs, it acts by disrupting the DNA replication process of dividing cancer cells in the body. Hydroxyurea selectively inhibits ribonucleoside diphosphate reductase, an enzyme required to convert ribonucleoside diphosphates into deoxyribonucleoside diphosphates, thereby preventing cells from leaving the G1/S phase of the cell cycle. This agent also exhibits radiosensitizing activity by maintaining cells in the radiation-sensitive G1 phase and interfering with DNA repair.
Biochemical research has explored its role as a DNA replication inhibitor
Hydroxyurea has many pharmacological applications under the Medical Subject Headings classification system:
Antineoplastic Agents – Substances that inhibit or prevent the proliferation of neoplasms.
Antisickling Agents – Agents used to prevent or reverse the pathological events leading to sickling of erythrocytes in sickle cell conditions.
Nucleic Acid Synthesis Inhibitors – Compounds that inhibit cell production of DNA or RNA.
Enzyme Inhibitors – Compounds or agents that combine with an enzyme in such a manner as to prevent the normal substrate-enzyme combination and the catalytic reaction.
Cytochrome P-450 CYP2D6 Inhibitors – Acts as an inhibitor to one of the most important enzymes involved in the metabolism of xenobiotics in the body, CYP2D6 a member of the cytochrome P450 mixed oxidase system.

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