I am a 20 year old male and are prescribed Adderall IR 20 mg twice a day. Ok first off I barely can notice anything anymore with the 20 mgs., but when I do take them everything is good to go. While im on Adderall my heart rate is normal but the next day my heart rate is up some. Which makes me nervous so I dont take my Adderall that day so badically I cant get on the routine. So in short I take my Adderall one day, and heart rate stays normal, the next day my heart rate is up a little so it makes me too nervous to take it for a 2nd day in a row causing me to not be able to stay on a routine. So any thoughts on why this is? Is it cause im not use to the medication yet or what?