2 results about "Levonorgestrel" patented technology

Levonorgestrel is a hormonal medication which is used in a number of birth control methods. As an emergency birth control, sold under the brand name Plan B among others, it is useful within 120 hours of unprotected sex. The more time that has passed since sex, the less effective the medication becomes, and it does not work after pregnancy (implantation) has occurred. It decreases the chances of pregnancy by 57 to 93%. It is also combined with an estrogen to make combination birth control pills. In an intrauterine device (IUD), such as Mirena among others, it is effective for the long-term prevention of pregnancy. An implantable form of levonorgestrel is also available in some countries.