I just switched from 60 mgs of D-amphetamine salts(adderal-non time realeased) to 100 mg vyvanse. I was on my adderall for about 9 months and started at a low dose and gradually increased to 60 mgs a day. After noticing its effects almost non existent i consulted my doctor, therefor changing to vyvanse. I took 100 mgs at 1pm today, and overall it worked fine through out the day. But the negative side effects after the pill has been metabalised and starts wearing off are driving me crazy. Nausia, nervousness which is causing anxiety, upper stomach pain, and vomitting. overall just a bad feeling. Does anyone have any suggestions on how i can conteract or minimilise these side effects? or what has worked for you while you were just starting this medication?