Yes, stimulant medications are immediate. They work when they’re in your system and have no effect when they’re not. It will take a few days for your child to acclimate to their brain working somewhat differently, so you may see a few more changes or shifts. Sounds like a great start though.
A Patient’s Primer on the Stimulant Medications Used to Treat ADHD
Penny
ADDitude Community Moderator, Parenting ADHD Coach & Author, Mom to teen w/ ADHD, LDs, and autism