The whole idea of clinical trials etc. with drugs is to determine an optimal dosing regimen, that provides efficacy and safety.
Drugs are prescribed in the manner in which they are so that these things occur.
Messing about with part doses/alternate days etc. is rubbish, may be dangerous, and is a waste of time and money.
TAKE THE DRUGS AS PRESCRIBED. That's why your taxes help pay for the education that Doctors have received!
RD.