Mydayis Peak Effect Time
Mydayis reaches peak plasma concentrations approximately 7-10 hours after dosing in pediatric patients and about 8 hours in adults. 1
Pharmacokinetic Profile
According to the FDA label, following administration of Mydayis, peak plasma concentrations (Tmax) occur at approximately 7-10 hours in pediatric patients (ages 6-17 years) and about 8 hours in adults for both d-amphetamine and l-amphetamine 1. This extended time to peak effect is a defining characteristic of Mydayis's unique triple-bead delivery system.
Key Timing Considerations:
- Fasted state: Peak occurs at approximately 7-8 hours post-dose
- With high-fat meal: Tmax is significantly prolonged:
- d-amphetamine: delayed by 5 hours (from 7.0 to 12.0 hours)
- l-amphetamine: delayed by 4.5 hours (from 7.5 to 12.0 hours) 1
Formulation Design
Mydayis contains three types of drug-releasing beads designed for extended coverage:
- Immediate-release beads
- First delayed-release beads (release at pH 5.5)
- Second delayed-release beads (release at pH 7.0) 1
This tri-phasic release mechanism creates an ascending plasma concentration profile throughout the day, distinguishing it from other amphetamine formulations that typically peak within 1-3 hours 2.
Clinical Implications:
The 7-10 hour peak time means Mydayis provides sustained symptom control throughout the day rather than an early morning peak. This pharmacokinetic profile supports once-daily morning dosing with coverage extending into the evening hours, as the mean plasma elimination half-life ranges from 10-11 hours for d-amphetamine and 10-13 hours for l-amphetamine 1.
Important caveat: If patients consume Mydayis with a high-fat meal, expect the peak effect to be delayed until approximately midday (12 hours post-dose), which may result in suboptimal morning symptom control 1.