Overview A Drug Interaction Study of SPD503 and Vyvanse Administered Alone and In Combination in Normal Healthy Volunteers Status: Completed Trial end date: 2009-07-30 Target enrollment: Participant gender: Summary Drug-drug interaction study; to examine the pharmacokinetics of SPD503 and VYVANSE (lisdexamfetamine dimesylate) when given alone, and in combination. Phase: Phase 1 Details Lead Sponsor: ShireTreatments: GuanfacineLisdexamfetamine Dimesylate