My Sons 16 Yea Old Friend Came Over And Spilled

My sons 16 yea old friend came over and spilled his ADHD medicine, I four d one on the floor 50 mg vyvance, I don't know but my 2 year old grandson has been acting strange for the past few hours like very compulsive with pacifier for 2 hours hypnotized and swapping out in mouth I don't know for sure but it liiks like a teerth mark on capsule I found, what would behavior be if he took one