I dont want to start with a high does, will 10mg work ? I used to take phentermine 37.5 I cut the pill into 4 pices, one piece in morning, another piece around 12pm when i first started out with it until i worked up to 1/2 in the am 1/2 in the early afternoon. Anyhow is Vyvanse like phen? Should i start on the lowest dose? Also as for taking my muti vitamins, how long should i wait after taking my vits before i take the Vyvanse?