Apparently the official Concerta version has some trademarked time-release technology, so it's a series of small evenly-spaced doses.
I don't know what about it is trademarked but it makes it very hard to compete with.
Well there's your problem. You only need 1 medicine. If you eat more than they fight each other in your system and don't work because they die in battle. 4 or 5 is like a world War.
They likely tried them one after the other... Makes more sense before you assume they just down 4 different meds at the same time. Still possible of course.