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Siklos
Overview
What is Siklos?
SIKLOS (hydroxyurea) is an antimetabolite that is available for oral use as 100 mg film-coated tablet and functionally triple-scored 1,000 mg film-coated tablet containing 100 and 1,000 mg of hydroxyurea, respectively. Inactive ingredients include silicified microcrystalline cellulose, sodium stearyl fumarate, and film-coating agent amino methacrylate copolymer.
Hydroxyurea is a white crystalline powder. It has a molecular weight of 76.05. Its structural formula is:
What does Siklos look like?
What are the available doses of Siklos?
Tablets: 100 mg and functionally triple-scored 1,000 mg tablet
What should I talk to my health care provider before I take Siklos?
How should I use Siklos?
SIKLOS is indicated to reduce the frequency of painful crises and to reduce the need for blood transfusions in pediatric patients, 2 years of age and older, with sickle cell anemia with recurrent moderate to severe painful crises.
The recommended SIKLOS dosing is described in Table 1.
Siklos is available in 100 mg and 1,000 mg tablets. The 1,000 mg tablets have 3 score lines and can be split into 4 parts (each 250 mg). Therefore, the two strengths can be used to deliver doses of 1,000 mg, 750 mg, 500 mg, 250 mg, 100 mg, and combinations thereof. Calculate the rounded doses to the nearest 50 mg or 100 mg strength based on clinical judgment.
Do not split the SIKLOS 100 mg tablets into smaller parts.
Patients must be able to follow directions regarding drug administration and their monitoring and care.
Fetal hemoglobin (HbF) levels may be used to evaluate the efficacy of SIKLOS in clinical use. Obtain HbF levels every three to four months. Monitor for an increase in HbF of at least two-fold over the baseline value.
What interacts with Siklos?
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What are the warnings of Siklos?
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What are the precautions of Siklos?
Sorry No Records found
What are the side effects of Siklos?
Sorry No records found
What should I look out for while using Siklos?
SIKLOS is contraindicated in:
What might happen if I take too much Siklos?
Acute mucocutaneous toxicity has been reported in patients receiving hydroxyurea at doses several times above the therapeutic dose. Soreness, violet erythema, oedema on palms and soles followed by scaling of hand and feet, severe generalized hyperpigmentation of the skin and stomatitis have been observed. In patients with sickle cell anemia, neutropenia was reported in isolated cases of hydroxyurea overdose (1.43 times and 8.57 times of the maximum recommended dose of 35 mg/kg b.w./day). Monitor blood counts weekly until recovery. Treatment of overdose consists of gastric lavage, followed by symptomatic treatment and control of bone marrow function.
How should I store and handle Siklos?
Store at 20°C to 25°C (68°F to 77°F); excursions permitted between 15°C and 30°C (59°F and 86°F) [see USP Controlled Room Temperature]. Keep tightly closed.Broken 1,000 mg tablets must be stored in the bottle and must be used within three months.Store at 20°C to 25°C (68°F to 77°F); excursions permitted between 15°C and 30°C (59°F and 86°F) [see USP Controlled Room Temperature]. Keep tightly closed.Broken 1,000 mg tablets must be stored in the bottle and must be used within three months. PNV - Omega is supplied in child-resistant bottles of 30 softgels (42192-332-30). The listed product is not a National Drug Code, but has merely been formatted to comply with standard industry practice for pharmacy and insurance computer systems.Store at 20° - 25°C (68° - 77°F) [See USP]. PNV - Omega is supplied in child-resistant bottles of 30 softgels (42192-332-30). The listed product is not a National Drug Code, but has merely been formatted to comply with standard industry practice for pharmacy and insurance computer systems.Store at 20° - 25°C (68° - 77°F) [See USP].
Clinical Information
Chemical Structure
No Image foundClinical Pharmacology
The precise mechanism by which hydroxyurea produces its cytotoxic and cytoreductive effects is not known. However, various studies support the hypothesis that hydroxyurea causes an immediate inhibition of DNA synthesis by acting as a ribonucleotide reductase inhibitor, without interfering with the synthesis of ribonucleic acid or of protein.
The mechanisms by which SIKLOS produces its beneficial effects in patients with sickle cell Anemia (SCA) are uncertain. Known pharmacologic effects of SIKLOS that may contribute to its beneficial effects include increasing hemoglobin F levels in red blood cells (RBCs), decreasing neutrophils, increasing the water content of RBCs, increasing deformability of sickled cells, and altering the adhesion of RBCs to endothelium.
Non-Clinical Toxicology
SIKLOS is contraindicated in:Because tetracyclines have been shown to depress plasma prothrombin activity, patients who are on anticoagulant therapy may require downward adjustment of their anticoagulant dosage.
Since bacteriostatic drugs may interfere with the bactericidal action of penicillin, it is advisable to avoid giving tetracyclines in conjunction with penicillin.
Absorption of tetracyclines is impaired by antacids containing aluminum, calcium, or magnesium, and iron-containing preparations.
Barbiturates, carbamazepine, and phenytoin decrease the half-life of doxycycline.
The concurrent use of tetracycline and methoxyflurane has been reported to result in fatal renal toxicity.
Concurrent use of tetracycline may render oral contraceptives less effective.
Hydroxyurea causes severe myelosuppression. Do not initiate treatment with hydroxyurea in patients if bone marrow function is markedly depressed. Bone marrow suppression may occur, and leukopenia is generally its first and most common manifestation. Thrombocytopenia and anemia occur less often, and are seldom seen without a preceding leukopenia.
Some patients, treated at the recommended initial dose of 20 mg/kg/day, have experienced severe or life-threatening myelosuppression. Due to the change in body weight requiring modification of daily dose, pediatric patients have an increased risk of myelosuppression at the time of dose adjustment.
Evaluate hematologic status prior to and during treatment with SIKLOS. Provide supportive care and modify dose or discontinue SIKLOS as needed. Recovery from myelosuppression is usually observed within 15 days when therapy is interrupted. Resume therapy after interruption at a lower dose .
Myelosuppression
Malignancies
Embryo-fetal toxicity
Vasculitic toxicities (including Leg Ulcers)
Risks with concomitant use of antiretroviral drugs
Risk with concomitant use of live virus vaccine
Macrocytosis
Reference
This information is obtained from the National Institute of Health's Standard Packaging Label drug database.
"https://dailymed.nlm.nih.gov/dailymed/"
While we update our database periodically, we cannot guarantee it is always updated to the latest version.
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