What if your daughter took Concerta at night accidentally?

She'll be doing homework for the next 8 hours. Modification to original answer about homework for 8 hours: Actually, that depends on many factors. If it was her Concerta, and she normally took it in the morning (which is the most common, from what I have been told), at the same or a higher dose than she accidentally took at night, it might realistically have no effect. If it was her Concerta, she presumably has ADD or ADHD. If so, while Concerta might act as a "speed" for others, it would normally have the opposite effect on her - and that is exactly why she has it. So if it was somebody else's Concerta, and she does not have ADD or ADHD, she should expect to be "wired" for a time, depending on dosage and how tired she is. "Wired" might include jumpy, unable to concentrate, unable to sit still, unable to sleep, unable to think or talk about a single topic for even a moderate amount of time. Think the stereotypical over-caffeinated-but-tired employee that comedians make jokes about. Lots of Words, really fast, but not much useful communication or work. An irony of ADHD is that Concerta, when it works, makes ADHD patients more "normal", and yet it makes "normal" people much more ADHD-like. Something about brain chemistry that is way above my education. I am no MD or pharmacist, but I have been reading about Concerta and have read what appear to be relatively reliable sites saying that Concerta can actually help adults with ADD and ADHD to sleep better. I have ADHD and found Concerta completely ineffective for any purpose at the dosages prescribed. No effects, no side effects. For my mid-teens kid, it has worked as advertised, in the mid-range of recommended dosages, and has been a significant aid to functionality, especially in the classroom but also in other environments requiring concentration and extended listening. Still a teenager, though. Just one that, when motivated, can sit still and listen much more easily than before the prescription. (That motivation seems limited to locations outside the home, except when she is watching a good movie - a teenager). I am on a combination of other meds, one of which is generally considered more of a "speed" than Concerta. Together, my meds have substantially and unexpectedly increased my average hours of sleeping per night from 4 or 5 to over 7. And taking the amphetamine later in the day (I have not yet tried it "at night" - after 6 or 7 pm) has not changed this new pattern - it takes effort for me to stay up past 11, even though, before I went on the meds, I could, with any motivation, stay up past 2 or 3, and with real motivation, even until 5 or 6, and then restart at 8. So the meds, including the amphetamine, have increased my sleep. So your daughter might be fine, or she might be in for a horrible night.