How many hours after taking the contraceptive pill is it effective?
May 10, 2023
Source: Cainiu Health
Dr. Lv Aiming
Introduction
The effectiveness of contraceptive pills in terms of how many hours after taking them depends on the specific type of medication, such as short-acting oral contraceptives or emergency contraceptive pills. Short-acting oral contraceptives generally need to be taken daily, with the next cycle starting after a 7-day break. Emergency contraceptive pills can be taken within 72 hours after unprotected intercourse, while mifepristone tablets should be taken within 12 hours after unprotected intercourse to achieve effective contraception.
How many hours after taking birth control pills they become effective depends on the type of medication, such as short-term oral contraceptives or emergency contraceptives. The specific analysis is as follows:
1. Short-term oral contraceptives
Commonly used medications in clinical practice include desogestrel-ethinyl estradiol tablets and norethisterone-ethinyl estradiol tablets. These are generally taken daily, with the next cycle starting after a 7-day break. They work by inhibiting ovulation and preventing implantation of the fertilized egg, thereby achieving contraceptive effects.
2. Emergency contraceptives
Commonly used drugs include levonorgestrel tablets and compound levonorgestrel tablets, which are typically effective when taken within 72 hours after unprotected intercourse. Additionally, mifepristone tablets can be taken within 12 hours after unprotected intercourse to achieve contraception.
Because birth control pills may have significant side effects, it is recommended to use them under a doctor's guidance to avoid bodily discomfort caused by self-medication.
