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The generic Concerta does not have the same time-release mechanism as brand. The brand is much more evenly disbursed in our experience. When switched to generic, it was almost like my son wasn’t taking any meds at all. You can ask that the doctor write the script for brand only.
Rebound is also common when meds wear off in the afternoon:
Of course, it could be that he needs a higher dose, or that Concerta or methylphenidates are the right medication for him. 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.
ADDitude Community Moderator, Parenting ADHD Trainer & Author, Mom to teen w/ ADHD, LDs, and autism