my friend has this pill for the treatment of ADD. i searched for it on webmd.com but was unable to find anything. its a d shaped pill with a D on one side and a 10 on the other. anybody know what it is? my friend thinks his doctor said something about it being a single isomer of ritalin? he also said it starts with an f. I snorted one and a half and the high was similar to ritalin. id like to find out what it is.