Postinor Tabs 2'sPostinor 2 also known as P2 contains the active ingredient levonorgestrel. It is commonly known as the morning after pill, used only as an emergency contraceptive. It is used to prevent pregnancy when taken within 72 hours (3 days) of unprotected intercourse sex. It is not used as a regular, long term method of contraception. It reduce the chance of pregnancy in two ways: If taken before ovulation, it may delay the release of the egg or if taken after