well that is interesting since it is available in the 150mg. since he gave you the option of taking it twice a day I am guessing that is why he didn't give you the one pill. I was told that wellbutrin can amp you up. maybe he was worried about this side effect or some other side effect bothering you if you took the whole dose at once so he was giving you the option of taking it twice a day. I have never had this problem with it though. take care.