I’m on the mini pill as I suffer from bad migraines and there is a smaller risk for blood clots with the mini pill. Side effects are the same as the combined pill, but the effects you may experience vary for everyone. The mini pill has a shorter usage window, so it must be taken around the same time each day while the combined pill has a 24 hour usage window. It is no less effective, there is just an easier chance to take pills late and protection is lost if a pill is missed. My mini pill has no break weeks unlike the combined pill.