The 200mg tablet is the standard adult dose for three FDA-approved conditions:Narcolepsy & Sleep Apnea: Patients typically take one 200mg tablet once daily in the morning.Shift Work Disorder (SWD): For those working nights, the dose is taken one hour before the start of the work shift to ensure peak alertness during duty hours.While doctors sometimes explore dosages up to 400mg, clinical data consistently shows that 200mg provides the maximum benefit for most people, with higher doses often increasing side effects without significantly improving alertness.