The purpose of this study is to assess the effect of multiple doses of isavuconazole on the pharmacokinetics (PK) of warfarin after single dose administration.
Subjects will receive a single dose of warfarin on Day 1 followed by a 15 day wash-out period (time from warfarin dosing to isavuconazole dosing). On Days 16 and 17, isavuconazole will be dosed three times daily (TID). TID doses will be administered 8 hours apart. On Days 18 through 28, isavuconazole will be administered once daily (QD). All subjects will be administered a single dose of warfarin on Day 20. A follow up visit will occur approximately 7 days after the last dose of isavuconazole. Blood samples for pharmacokinetics will be collected throughout the study.
Study Type
INTERVENTIONAL
Allocation
NA
Masking
NONE
Enrollment
20
oral
oral
Spaulding Clinical
West Bend, Wisconsin, United States
Composite of Pharmacokinetic (PK) variables for S-warfarin (in plasma): AUCinf, AUClast, Cmax
Area under the curve (AUC) from time 0 extrapolated to infinity (AUCinf), AUC from time of dosing to last quantifiable concentration (AUClast ), and maximum concentration (Cmax)
Time frame: Days 1 and 20, predose and at 0.5, 0.75, 1, 1.5, 2, 3, 4, 6, 8, 10, 12,16, 24, 48, 72, 96, 120, 144, 168, and 216 hours postdose
Composite of PK variables for R-warfarin (in plasma): AUCinf, AUClast, Cmax
Time frame: Days 1 and 20, predose and at 0.5, 0.75, 1, 1.5, 2, 3, 4, 6, 8, 10, 12,16, 24, 48, 72, 96, 120, 144, 168, and 216 hours postdose
Composite of Pharmacokinetic (PK) variables for S-warfarin and R-warfarin (in plasma): tmax, Vz /F, CL/F, and t1/2
Time to attain Cmax (tmax) , apparent volume of distribution (Vz /F), apparent body clearance after oral dosing (CL/F), and apparent terminal elimination half-life (t1/2)
Time frame: Days 1 and 20, predose and at 0.5, 0.75, 1, 1.5, 2, 3, 4, 6, 8, 10, 12,16, 24, 48, 72, 96, 120, 144, 168, and 216 hours postdose
PK variable for isavuconazole (in plasma): trough concentration (Ctrough)
Time frame: Days 18-20 and Days 22-27, predose and Day 28 predose and 24 hours post dose
Composite of PK variable for isavuconazole (in plasma): AUCtau , Cmax, and tmax
AUC during the time interval between consecutive dosing (AUCtau)
Time frame: Day 19 predose and at 0.5, 0.75, 1, 1.5, 2, 3, 4, 6, 8, 10, 12 and 16 hours post dose; and Day 20, predose and at 0.5, 0.75, 1, 1.5, 2, 3, 4, 6, 8, 10, 12, 16, 24, and 36 hours postdose
Pharmacodynamic Variables: MAXINR, AUCINR, MAXPT, and AUCPT
International Normalized Ratio (INR), Maximum observed change INR value (MAXINR), Area under the INR time curve from 0 to 216 hours (AUCINR), Maximum observed change in prothrombin time (PT)value (MAXPT), Area under the PT time curve from 0 to 216 hours (AUCPT)
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Time frame: Day 1 and Day 20 predose and at 6, 12, 24, 48, 72, 96, 168, and 216 hours post-warfarin-dose
Safety assessed by recording of adverse events, clinical laboratory evaluation, electrocardiograms (ECGs) physical examinations, and vital signs
Time frame: Day 1 through Day 29, Day 35 ± 2