Levonorgestrel butyrate is a female hormone that is able to prevent ovulation and thus is widely used as birth control methods. In pill form, it is useful within 120 hours as emergency birth control. It becomes less effective the longer after sex and only works before pregnancy has occurred. It is also combined with an estrogen to make combined orally bioavailable birth control pill. Within an IUD, it is effective for long term prevention of pregnancy. An implantable form of levonorgestrel is also marketed in some countries.

纯度：≥98%

CAS：86679-33-6