... would make me feel. I started on Wed 3-8-17. I took half (.25mg) for 5 days. On Friday i took the other half at night after the first one wore off. I'm assuming because the .25 isn't very strong that it isn't working very long so I've considered going ahead and taking the whole tablet as originally prescribed. I'm just wondering if there is going to be a very noticeable difference in the way it effects me? The first day i took the half dose i slept for 3 hours after, i had never taken Xanax before... If I take the full dose now, will it knock me out again or since I'm pretty use to it, will it not make me as drowsy? Thanks for any help!