The Hormone Releasing Intrauterine Device (IUD) also known as Mirena is one type of IUD available for use as a contraceptive. It is also referred to as the levonorgestrel IUD or LNG-IUD because it contains levonorgestrel, a synthetic progesterone.

The LNG IUD is a 32mm long T shaped plastic device with a monofilament thread attached to a loop on the bottom of the stem which is inserted into the uterus. It contains 52mg of levonorgestrel which is released at a rate of 20 micrograms per day which acts to prevent penetration of sperm through the cervix hence preventing pregnancy. The LNG IUD must be replaced after 5 years.

The hormone releasing IUD also has many other uses apart from its role as a contraceptive. This IUD is also useful alternative to hysterectomy for the treatment of menorrhagia, dysfunctional uterine bleeding and leiomyomas. However, unlike the copper IUD it cannot be used as an emergency contraceptive.

For more information see Intrauterine Device (IUD)

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