Mini pill vs combined pill - What is the difference?
The main difference between the mini pill and the combined pill is that the mini pill only contains progesterone. This also means that it contains a lower dose of hormones. Some women find that they experience fewer side effects while using a progesterone-only pill.
Due to the lower hormone dose, many brands of the mini pill need to be taken within a relatively small time window of three hours every day, in order to work effectively. However, some new mini pills such as Cerazette will still work if taken up to 12 hours late (just like the combined pill).
While combined pills are taken for 21 days followed by a seven day break, progesterone-only pills are taken for 28 days straight. When you finish one pack, you need to start the next one the following day without taking a break.