FDA Approves New SPRYCEL(R) (Dasatinib) Product Labeling for Patients with Chronic...(hat dasatinib has the potential to prolo...)

Date:11/8/2007

hat dasatinib has the potential to prolong cardiac ventricular repolarization (QT interval). Nine patients had QTc prolongation as an adverse event. Three patients (<1%) experienced a QTcF >500 msec. SPRYCEL should be administered with caution to patients who have or may develop prolongation of QTc, including patients with hypokalemia, hypomagnesemia, or congenital long QT syndrome and patients taking anti- arrhythmic drugs, other medicinal products that lead to QT prolongation, or cumulative high-dose anthracycline therapy. Hypokalemia or hypomagnesemia should be corrected prior to SPRYCEL administration.

Drug Interactions:

Dasatinib is a CYP3A4 substrate. Drugs that may increase dasatinib concentrations are: Strong CYP3A4 inhibitors (e.g., ketoconazole, itraconazole, clarithromycin, atazanavir, indinavir, nefazodone, nelfinavir, ritonavir, saquinavir, telithromycin, voriconazole). Concomitant use of dasatinib and drugs that inhibit CYP3A4 should be avoided. If systemic administration of a potent CYP3A4 inhibitor cannot be avoided, close monitoring for toxicity and a SPRYCEL dose reduction or temporary discontinuation should be considered. Grapefruit juice may also increase plasma concentrations of dasatinib and should be avoided. Drugs that may decrease dasatinib concentrations are: Strong CYP3A4 inducers (e.g., dexamethasone, phenytoin, carbamazepine, rifampin, rifabutin, phenobarbital). Alternative agents with less enzyme induction potential should be used or a dose increase of SPRYCEL should be considered. St John's Wort may decrease dasatinib plasma concentrations unpredictably and should be avoided.

Dasatinib is a time-dependent inhibitor of CYP3A4. Drugs that may have their plasma concentration altered by dasatinib are: CYP3A4 substrates such as simvastatin. Therefore, CYP3A4 substrates with a narrow therapeutic index (e.g., alfentanil, astemizole, terfenadine, cisapride, cyclosporine, fentanyl, pimozide, quinidine, sirolimus, tacrolimus, o
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SOURCE Bristol-Myers Squibb Company Copyright©2007 PR Newswire. All rights reserved

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