The levonorgestrel intrauterine system: Long-term contraception and therapeutic effects (PDF)
Women's Health 1(2): 171-182
Publication date: 2005
The levonorgestrel intrauterine system (Mirena®) has been developed as a long-acting method of contraception. This medicated device, inserted into the uterus, delivers a small daily dose of a progestin, levonorgestrel, into the uterine cavity. It is one of the most effective methods of contraception and is approved in more than 100 countries for 5 years of use.