This could be attributed to several things. When my own son first tried Concerta, after trying a few other ADHD meds, it was the worst day he’d had, and he had had many stinkers. BUT, after that first day, the Concerta worked well for him. He just needed time to adjust to his neurology working differently. That’s one possibility. The others are that this is the wrong medication or wrong type of stimulant for him, or that the dose is too high or too low.
There are two types of stimulants: amphetamine (Adderall, Vyvanse, Evekeo…) and methylphenidate (Ritalin, Concerta, Quillivant…). Almost everyone does well on one type or the other, but not both. ADHD medication takes a lot of trial and error to find the right medication and dosage for an individual. The first medication tried rarely is the right one.
ADDitude Community Moderator, Parenting ADHD Trainer & Author, Mom to teen w/ ADHD, LDs, and autism