US here. Once had a pharmacist not fill a script for Vyvanse because my doctor's instructions were "take half tablet daily as needed". These were chewables with

US here. Once had a pharmacist not fill a script for Vyvanse because my doctor's instructions were "take half tablet daily as needed". These were chewables with perforation marks on them, but apparently it didn't explicitly say on the Vyvanse instructions that you could split them or not. In the US, when purchasing Vyvanse with cash (most insurance won't cover it), the price is dictated by number of pills, NOT by the dosage of those pills. So, it is half the cost to get 15 pills that you take a half of daily versus a standard 30 day supply. I think the 30 day supply was somewhere in the realm of $400 by the way. Vyvanse patent expired last month, so hopefully a generic product comes out soon!