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Uses
Sirolimus tablets are indicated for the prophylaxis of organ rejection in patients aged 13 years or older receiving renal transplants. Therapeutic drug monitoring is recommended for all patients receiving sirolimus [see DOSAGE AND ADMINISTRATION (2.3), WARNINGS AND PRECAUTIONS (5.15)].
In patients at low- to moderate-immunologic risk, it is recommended that sirolimus tablets be used initially in a regimen with cyclosporine and corticosteroids; cyclosporine should be withdrawn 2 to 4 months after transplantation [see DOSAGE AND ADMINISTRATION (2.1)].
In patients at high-immunologic risk (defined as Black recipients and/or repeat renal transplant recipients who lost a previous allograft for immunologic reason and/or patients with high panel-reactive antibodies [PRA; peak PRA level > 80%]), it is recommended that sirolimus tablets be used in combination with cyclosporine and corticosteroids for the first year following transplantation [see DOSAGE AND ADMINISTRATION (2.2), CLINICAL STUDIES (14.3)].
Cyclosporine withdrawal has not been studied in patients with Banff Grade 3 acute rejection or vascular rejection prior to cyclosporine withdrawal, those who are dialysis-dependent, those with serum creatinine > 4.5 mg/dL, Black patients, patients of multi-organ transplants, secondary transplants, or those with high levels of panel-reactive antibodies [see CLINICAL STUDIES (14.2)].
In patients at high-immunologic risk, the safety and efficacy of sirolimus tablets used in combination with cyclosporine and corticosteroids has not been studied beyond one year; therefore after the first 12 months following transplantation, any adjustments to the immunosuppressive regimen should be considered on the basis of the clinical status of the patient [see CLINICAL STUDIES (14.3)].
In pediatric patients, the safety and efficacy of sirolimus tablets have not been established in patients < 13 years old, or in pediatric (< 18 years) renal transplant patients considered at high-immunologic risk [see ADVERSE REACTIONS (6.5), CLINICAL STUDIES (14.6)]. The safety and efficacy of de novo use of sirolimus tablets without cyclosporine have not been established in renal transplant patients [see WARNINGS AND PRECAUTIONS (5.12)].
The safety and efficacy of conversion from calcineurin inhibitors to sirolimus tablets in maintenance renal transplant patients have not been established [see CLINICAL STUDIES (14.4)].
History
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Other Information
Sirolimus is an immunosuppressive agent. Sirolimus is a macrocyclic lactone produced by Streptomyces hygroscopicus. The chemical name of sirolimus (also known as rapamycin) is (3S,6R,7E,9R,10R,12R,14S,15E,17E,19E,21S,23S,26R,27R,34aS)-9,10,12,13,14,21,22,23,24,25,26,27,32,33,34,34a-hexadecahydro-9,27-dihydroxy-3-[(1R)-2- [(1S,3R,4R)-4-hydroxy-3-methoxycyclohexyl]-1-methylethyl]-10,21-dimethoxy-6,8,12,14,20,26- hexamethyl-23,27-epoxy-3H-pyrido[2,1-c][1,4] oxaazacyclohentriacontine-1,5,11,28,29 (4H,6H,31H)-pentone. Its molecular formula is C51H79NO13 and its molecular weight is 914.2. The structural formula of sirolimus is illustrated as follows.
Sirolimus is a white to off-white powder and is insoluble in water, but freely soluble in benzyl alcohol, chloroform, acetone, and acetonitrile.
Each sirolimus tablet intended for oral administration contains 0.5 mg of sirolimus. In addition, each tablet contains the following inactive ingredients: citric acid monohydrate, crospovidone, FD&C yellow #5 Aluminium Lake, glyceryl monooleate, hypromellose, iron oxide yellow, lactose monohydrate, microcrystalline cellulose, poloxamer, polyethylene glycol, povidone, sucrose, talc, titanium dioxide and vitamin E acetate.
Sources
Bubble Gum Scented Hand Sanitizer Manufacturers
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Bubble Gum Scented Hand Sanitizer | American Health Packaging
Sirolimus tablets are to be administered orally once daily, consistently with or without food [see DOSAGE AND ADMINISTRATION (2.4), CLINICAL PHARMACOLOGY (12.3)].
Tablets should not be crushed, chewed or split. Patients unable to take the tablets should be prescribed the solution and instructed in its use.
The initial dose of sirolimus tablets should be administered as soon as possible after transplantation. It is recommended that sirolimus tablets be taken 4 hours after administration of cyclosporine oral solution (MODIFIED) and or/cyclosporine capsules (MODIFIED) [see DRUG INTERACTIONS (7.2)].
Frequent sirolimus tablets dose adjustments based on non-steady-state sirolimus concentrations can lead to overdosing or underdosing because sirolimus has a long half-life. Once sirolimus tablets maintenance dose is adjusted, patients should continue on the new maintenance dose for at least 7 to 14 days before further dosage adjustment with concentration monitoring. In most patients, dose adjustments can be based on simple proportion: new sirolimus tablets dose = current dose x (target concentration/current concentration). A loading dose should be considered in addition to a new maintenance dose when it is necessary to increase sirolimus trough concentrations: sirolimus loading dose = 3 x (new maintenance dose - current maintenance dose). The maximum sirolimus tablets dose administered on any day should not exceed 40 mg. If an estimated daily dose exceeds 40 mg due to the addition of a loading dose, the loading dose should be administered over 2 days. Sirolimus trough concentrations should be monitored at least 3 to 4 days after a loading dose(s).
2.1 Patients at Low- to Moderate-Immunologic RiskSirolimus and Cyclosporine Combination Therapy
For de novo renal transplant patients, it is recommended that sirolimus tablets be used initially in a regimen with cyclosporine and corticosteroids. A loading dose of sirolimus equivalent to 3 times the maintenance dose should be given, i.e. a daily maintenance dose of 2 mg should be preceded with a loading dose of 6 mg. Therapeutic drug monitoring should be used to maintain sirolimus drug concentrations within the target-range [see DOSAGE AND ADMINISTRATION (2.3)].
Sirolimus Following Cyclosporine Withdrawal
At 2 to 4 months following transplantation, cyclosporine should be progressively discontinued over 4 to 8 weeks, and the sirolimus dose should be adjusted to obtain sirolimus whole blood trough concentrations within the target-range [see DOSAGE AND ADMINISTRATION (2.3)]. Because cyclosporine inhibits the metabolism and transport of sirolimus, sirolimus concentrations may decrease when cyclosporine is discontinued, unless the sirolimus dose is increased [see CLINICAL PHARMACOLOGY (12.3)].
2.2 Patients at High-Immunologic RiskIn patients with high-immunologic risk, it is recommended that sirolimus be used in combination with cyclosporine and corticosteroids for the first 12 months following transplantation [see CLINICAL STUDIES (14.3)]. The safety and efficacy of this combination in high-immunologic risk patients has not been studied beyond the first 12 months. Therefore, after the first 12 months following transplantation, any adjustments to the immunosuppressive regimen should be considered on the basis of the clinical status of the patient.
For patients receiving sirolimus with cyclosporine, sirolimus therapy should be initiated with a loading dose of up to 15 mg on day 1 post-transplantation. Beginning on day 2, an initial maintenance dose of 5 mg/day should be given. A trough level should be obtained between days 5 and 7, and the daily dose of sirolimus should thereafter be adjusted [see DOSAGE AND ADMINISTRATION (2.3)].
The starting dose of cyclosporine should be up to 7 mg/kg/day in divided doses and the dose should subsequently be adjusted to achieve target whole blood trough concentrations [see DOSAGE AND ADMINISTRATION (2.3)]. Prednisone should be administered at a minimum of 5 mg/day.
Antibody induction therapy may be used.
2.3 Therapeutic Drug MonitoringMonitoring of sirolimus trough concentrations is recommended for all patients, especially in those patients likely to have altered drug metabolism, in patients ≥ 13 years who weigh less than 40 kg, in patients with hepatic impairment, when a change in the sirolimus dosage form is made, and during concurrent administration of strong CYP3A4 inducers and inhibitors [see DRUG INTERACTIONS (7)].
Therapeutic drug monitoring should not be the sole basis for adjusting sirolimus therapy. Careful attention should be made to clinical signs/symptoms, tissue biopsy findings, and laboratory parameters.
When used in combination with cyclosporine, sirolimus trough concentrations should be maintained within the target-range [see CLINICAL STUDIES (14), CLINICAL PHARMACOLOGY (12.3)]. Following cyclosporine withdrawal in transplant patients at low- to moderate-immunologic risk, the target sirolimus trough concentrations should be 16 to 24 ng/mL for the first year following transplantation. Thereafter, the target sirolimus concentrations should be 12 to 20 ng/mL.
The above recommended 24 hour trough concentration ranges for sirolimus are based on chromatographic methods. Currently in clinical practice, sirolimus whole blood concentrations are being measured by both chromatographic and immunoassay methodologies. Because the measured sirolimus whole blood concentrations depend on the type of assay used, the concentrations obtained by these different methodologies are not interchangeable [see WARNINGS AND PRECAUTIONS (5.15), CLINICAL PHARMACOLOGY (12.3)]. Adjustments to the targeted range should be made according to the assay utilized to determine sirolimus trough concentrations. Since results are assay and laboratory dependent, and the results may change over time, adjustments to the targeted therapeutic range must be made with a detailed knowledge of the site-specific assay used. Therefore, communication should be maintained with the laboratory performing the assay. A discussion of different assay methods is contained in Clinical Therapeutics, Volume 22, Supplement B, April 2000 [see REFERENCES (15)].
2.4 Patients with Low Body WeightThe initial dosage in patients ≥ 13 years who weigh less than 40 kg should be adjusted, based on body surface area, to 1 mg/m2/day. The loading dose should be 3 mg/m2.
2.5 Patients with Hepatic ImpairmentIt is recommended that the maintenance dose of sirolimus be reduced by approximately one third in patients with mild or moderate hepatic impairment and by approximately one half in patients with severe hepatic impairment. It is not necessary to modify the sirolimus loading dose [see CLINICAL PHARMACOLOGY (12.3)].
2.6 Patients with Renal ImpairmentDosage adjustment is not needed in patients with impaired renal function [see USE IN SPECIFIC POPULATIONS (8.7)].
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