It might knock you out in the AM. I take 40 mg in the AM and 240 mg in the PM (i don't recommend that haha. the FDA limit is 160 mg and it's always a pain to get my prescription authorized at the beginning of the year). It makes me so tired all the time. I wish I could get away with taking it 1 time a day but I get withdrawals if I don't take it twice a day. I take nuvigil to stay awake during the day. I swear when i take morning meds I could take a nap after, but my t says to stay awake all day. blah blah blah. Anyways, hope it helps. It's just kinda strong, so be careful doing things the first few days.