The mini pill (progesterone only pill) works by thickening the mucus in the cervix, preventing sperm from getting through to fertilise the egg. In some women, it also prevents ovulation. It must be taken every day during the same 3 hour period, otherwise pregnancy may occur.. There are no inactive or sugar pills, so unlike [...]

Most women get no side effects Some women get side effects such as irregular bleeding, headaches, acne, breast tenderness or changes in mood.

If used perfectly it is more than 99% effective, though with typical or “normal” use, it is about 91% effective

Yes, it can be used when breastfeeding, as it does not affect the flow of milk (whereas the combined oral contraceptive pill may reduce breast milk supply)

The POP is not usually the first choice if a woman wants to regulate her menstrual cycle. This is because the POP has different effects in different women- some may get irregular bleeding, others may get no period at all. So, whilst it may work out well for some users, it is not predictable (unlike [...]

Whilst there is evidence that the combined oral contraceptive pill (COCP) appears to cause a slight increase in breast cancer during use and for 5-10 years after stopping, the POP has not been connected to any increase in breast cancer.

Whilst the combined oral contraceptive pill (COCP) is known to increase a woman’s risk of developing a clot, the risk of having a clot when using the POP is much lower. 

No, if you wish to become pregnant, there is little or no delay to return to fertility when you stop taking the progesterone only pill.