A Drug Interaction Study of SPD503 and Vyvanse Administered Alone and In Combination in Normal Healthy Volunteers

SPD503 extended-release 4mg orally administered tablets. There are 3 dosing periods in the study. Subjects will receive one dosing regimen (arm) as a single oral dose on the first day of each dosing period. The order in which the subjects receive each arm (regimen) is randomly assigned. There is a 7-day break between each dosing period in which no medication is taken.

VYVANSE 50mg orally administered capsules. There are 3 dosing periods in the study. Subjects will receive one dosing regimen (arm) as a single oral dose on the first day of each dosing period. The order in which the subjects receive each arm (regimen) is randomly assigned. There is a 7-day break between each dosing period in which no medication is taken.

SPD503 4mg tablets + VYVANSE 50mg capsules orally administered together. There are 3 dosing periods in the study. Subjects will receive one dosing regimen (arm) as a single oral dose on the first day of each dosing period. The order in which the subjects receive each arm (regimen) is randomly assigned. There is a 7-day break between each dosing period in which no medication is taken.