"i was given 15 mg caplets and told to cut them in half.. 7.5 mg the 1st night. slept well but a little groggy the next day. didn&#039;t get much accomplished. 2nd night same dose and the next day was a total loss. just sat in my chair all day. no energy or drive. then i tried to further the dose by cutting 15 mg into 7.5 mg into 3.75 mg. that&#039;s next to impossible due to the shape of the half tab. one night you get decent dose and the next you get the smaller quarter and it doesn&#039;t work. too bad hey don&#039;t come in 10 mg tabs.  for me, a big guy, with lots of body mass 3.5 mg would be a good dose but it&#039;s impossible to get with any accuracy."