A Trial to Assess How Centanafadine Interacts With Stimulants in the Body

This study will look at how centanafadine works when taken together with stimulant medicines in healthy adults, and whether combining them affects how the body responds.

This is a single dose crossover study. Participants in each arm will receive 3 treatments in a 3 -sequence, 3-period, crossover design. In each arm, participants will be randomized to 1 of 3 treatment sequences: Sequence 1: ABC, Sequence 2: BCA, or Sequence 3: CAB. Here's what each treatment incudes: * Treatment A - centanafadine alone in both Arms 1 and 2. * Treatment B - methylphenidate alone in Arm 1 and lisdexamfetamine alone in Arm 2. * Treatment C - centanafadine combined with methylphenidate in Arm 1, and centanafadine combined with lisdexamfetamine in Arm 2. The duration of trial participation for each participant will be approximately 44 days, and the overall trial duration is expected to be approximately 3 months.