Postinor-2 is an emergency contraceptive pill (ECP) that is taken to prevent pregnancy within 72 hours of unprotected sex. It is a highly effective and safe form of birth control when used correctly and as directed. Postinor-2 is available in most countries around the world and is an important form of contraception for women who do not want to become pregnant and may not have access to other forms of birth control.
The active ingredient in Postinor-2 is levonorgestrel, a synthetic progestin that works by inhibiting ovulation and thickening the cervical mucus, which prevents sperm from entering the uterus. It is the most commonly used ECP and can be taken up to 72 hours (3 days) after unprotected sex.
Postinor-2 has been proven to be highly effective in preventing pregnancy when taken as directed within 72 hours of unprotected sex, with a success rate of 95%. It works best when taken as soon as possible after unprotected sex, and is more effective the sooner it is taken.
Postinor-2 is a safe and effective form of emergency contraception and should be considered an important option for women who do not want to become pregnant and may not have access to other forms of birth control. It is important to note that Postinor-2 does not protect against sexually transmitted infections and is not a substitute for regular contraception.

Postinor 2: The Complete User Guide on Emergency Medication to Prevent Conception and Pregnancy