Mirena (Hormonal Iud)
Mirena (Hormonal Iud)
If you’re looking for a long-term birth control option, you may consider an intrauterine device (IUD). An IUD is a small, flexible, T-shaped device that’s placed in your uterus mainly to prevent pregnancy. There are two types of IUDs: a copper IUD that does not release hormones, and a plastic IUD that releases controlled doses of hormones.
Mirena is a brand-name IUD that releases the hormone levonorgestrel. Here’s what you need to know about Mirena to decide if it’s a good birth control option for you.
Mirena can be used to prevent pregnancy for up to five years. It can also be used to reduce heavy menstrual bleeding in women who also want birth control. Other brand-name IUDs that release levonorgestrel include Liletta, Skyla, and Kyleena.
Mirena contains 52 mg of levonorgestrel, a hormone that’s often used in birth control pills. The device releases roughly 20 mcg of levonorgestrel per day. Over time, the device releases smaller amounts of the hormone, so Mirena needs to be replaced after five years.
Mirena works to prevent pregnancy in several ways:
- thickening the mucus of the cervix, which helps prevent sperm from entering the cervix
- preventing sperm from surviving in the uterus
- stopping the release of an egg from your ovary
- thinning the lining of your uterus, which makes it harder for a fertilized egg to implant in the uterus (and also reduces your menstrual bleeding)
Mirena must be inserted by a healthcare provider. This should be done within seven days of the start of one of your monthly periods. Your doctor will need to check your device four to six weeks after it’s placed, and once per year after that.