Abstract:
STUDY OBJECTIVES:To assess the use and safety of concurrent administration of voriconazole and sirolimus-which is contraindicated-and to determine approaches for appropriately managing patients who receive both drugs. DESIGN:Retrospective medical record review. SETTING:University-affiliated medical center. PATIENTS:Thirty-one cases in 23 inpatients who received at least one dose of voriconazole and sirolimus concomitantly within a 24-hour period. MEASUREMENTS AND MAIN RESULTS:Data on sirolimus and voriconazole indications, doses, routes, frequencies, and administration times; number of days of coadministration; and sirolimus dosage adjustments were collected. In addition, data on laboratory values, adverse events, sirolimus concentrations, and concomitant drugs, including cytochrome P450 (CYP) 3A isoenzyme and P-glycoprotein inhibitors and inducers, were collected for 7 days before, during, and for 14 days after coadministration. No cases of elevated sirolimus concentrations (>20 mg/ml) occurred in patients stabilized with voriconazole before starting low-dose sirolimus 0.5-1 mg/day, or in those stabilized with sirolimus 0.5-2 mg/day who had baseline sirolimus concentrations of 12 ng/ml or lower and whose sirolimus dose was decreased by 50% before the addition of voriconazole. In contrast, elevated sirolimus concentrations were experienced in patients receiving sirolimus doses of 4 mg/day or higher who had sirolimus concentrations of 12 ng/ml or higher and whose sirolimus dose was not decreased before addition of voriconazole. In a patient who received sirolimus with itraconazole, a strong CYP3A isoenzyme inhibitor, one case of only a minimal increase in the sirolimus concentration occurred after the addition of voriconazole. CONCLUSIONS:Sirolimus and voriconazole can be safely coadministered as long as consideration is given to which agent the patient receives first, the sirolimus dosage, sirolimus concentrations, and concurrent disease states and CYP3A isoenzyme inhibitors. Sirolimus concentrations should be closely and routinely monitored before, during, and after coadministration of voriconazole and other CYP3A isoenzyme inhibitors. Based on the results of this pilot study, a protocol on the management of this drug combination will be implemented and prospectively evaluated for efficacy and safety.
journal_name
Pharmacotherapyjournal_title
Pharmacotherapyauthors
Surowiec D,DePestel DD,Carver PLdoi
10.1592/phco.28.6.719subject
Has Abstractpub_date
2008-06-01 00:00:00pages
719-29issue
6eissn
0277-0008issn
1875-9114pii
10.1592/phco.28.6.719journal_volume
28pub_type
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