What is it?
The progestogen-only pill is sometimes called the mini-pill or POP. It contains the hormone progestogen but doesn't contain oestrogen. The progestogen-only pill is taken every day within a specific three-hour period.
How does it work?
The POP thickens the mucus in the cervix, which stops sperm getting to an egg. It also thins the lining of the womb so that an egg cannot implant itself there. In some women, it stops ovulation too.
How effective is it?
If taken correctly, it is 99% effective. This means that one woman in 100 who use the POP will become pregnant in a year.
Anything else to know about?
You have to take it at the same time each day. If you take it more than three hours late (or 12 hours late if you take Cerazette), it may not be effective.
If you’re sick or have severe diarrhoea, the POP may not work. Some medicines may also affect the POP's effectiveness. Ask your doctor for details.
Your periods could also stop or become lighter, irregular or more frequent.
Temporary side effects may include spotty skin and breast tenderness. These should clear up within a few months.
If you aren't in a monogamous (faithful) relationship you should help protect yourself against sexually transmitted infections by using condoms as well as the POP.