Patient's question:
How many hours after taking the short-term birth control pill does it start to work, and how long does the effect lastDoctor's answer:
Hello: Emergency contraception is a "emergency measure" taken after unprotected sex or when it is realized that contraception has failed (condom rupture, slippage, missed birth control pills, etc.) to prevent unintended pregnancy. There are mainly two types of emergency contraception pills. One is mifepristone tablets, marketed as "Fernier," which has the advantage of requiring only one tablet to be taken within 72 hours after sexual intercourse, with a contraceptive effectiveness of over 99%. Low-dose mifepristone was approved by the National Drug Administration in the early 21st century for emergency contraception. The other is levonorgestrel tablets, marketed as "Yuteng" and "Anteng," which features taking two tablets within 72 hours after sexual intercourse with a 12-hour interval, with a contraceptive effectiveness of over 98%. It was first used for emergency contraception in the 1990s.