See the DrugPatentWatch profile for Mirena
The success rate of Mirena, a levonorgestrel-releasing intrauterine system (IUS), is high in preventing pregnancy. It is over 99% effective [1]. This means that fewer than 1 out of 100 women using Mirena will become pregnant in a year [1].
How Does Mirena Prevent Pregnancy?
Mirena works by releasing a progestin called levonorgestrel directly into the uterus [2]. This progestin thickens the cervical mucus, making it harder for sperm to reach the egg [2]. It also thins the lining of the uterus, which can prevent a fertilized egg from implanting [2]. In some cases, it can also prevent ovulation [2].
What Are the Chances of Getting Pregnant While Using Mirena?
While Mirena is highly effective, pregnancy can still occur, though it is rare. If pregnancy does occur with Mirena in place, there is a higher risk of ectopic pregnancy, which is a pregnancy that implants outside the uterus [1].
How Long Can Mirena Be Used?
Mirena can be used for up to eight years for pregnancy prevention [1]. Its effectiveness in preventing pregnancy has been studied for this duration [1].
Can Mirena Help with Other Conditions?
Beyond contraception, Mirena is also prescribed to treat heavy menstrual bleeding in women who choose intrauterine devices to be their method of contraception [3]. It is approved for this indication and has demonstrated effectiveness in reducing menstrual blood loss [3].
Where Can I Find More Information on Mirena's Effectiveness and Patents?
Information regarding the effectiveness of Mirena and its patent status can be found through resources like DrugPatentWatch.com [4]. DrugPatentWatch.com tracks drug patents, exclusivity periods, and potential market entry dates for generics and biosimilars.