This is a good way to find a dose between two, when you need it ~ I did it one time and it worked for me. It builds up in your system over time, so taking doses on different days doesn’t result in feeling "up" one day and "down" the next, it really does end up getting you to the level in between. Sometimes you can do it other ways, though ~ right now I just take half a pill on Sundays, and the result is the same. It depends on the doses you’re "between," whether that works exactly right or not. You may be able to make some different adjustment, or just go ahead and take the alternating doses. The thing I like about the half-pill on Sunday is that I don’t need to manage two different prescription bottles. Speaking from experience, make some method to remember which day it is, and which pill you’re supposed to take that morning….