"i first took vyvanse about a year ago, was up to 50mg a day. i found it extremely helpful, but by late afternoon i was angry at everything and everyone. i decided to stop. i then tried a few other medicines (strattera and concerta). strattera didn&#039;t really work as well as a stimulant and had very negative effects on my sex life, and concerta didn&#039;t really work at all. i was ready to give up, but decided to give vyvanse another try. this time i lowered the does to 30mg, and only took it during the work week. wow - it made a huge difference. i&#039;m not seeing the same side effects that i did first time. so it is clear to me that i was over medicating. anyways, just thought i would share."