"i was diagnosed with add and my doctor recommended me to take vyvanse 40mg. the first day i took it around 6:00 am and it started to work about an hour in. i was able to focus very well and was a lot more sociable. however, the good effects of the medicine only lasted for 5 hours and then everything went downhill and i felt depressed. my heart was beating faster than usual, dry mouth, and had no desire for food. the next day thinking it would be better, it didn&#039;t kick in until around 2:00pm and only lasted for a few hours. sometimes it would leave me feeling very antisocial and aggitated. today is my last day taking it because it hasn&#039;t worked for me at all today. wasn&#039;t hungry all day, felt very sweaty, nervous, aggitated, out of breathe."