It contains a lower dose of hormones than comparable IUDs
There were mainly four IUDs on the market until now. ParaGard: for super long-term protection. It prevents pregnancy for up to 12 years. Liletta(52 milligrams levonorgestrel), and Skyla (13.5 milligrams levonorgestrel) — both stay good for three years. The fourth is Mirena (52 milligrams levonorgestrel), which prevents pregnancy for five years.
The new sensation, Kyleena contains just 19.5 milligrams of levonorgestrel. This makes it a great option for women who want the benefits of a hormonal IUD, and also want to limit their overall exposure to hormones.
It doesnot protect you from STIs
Kyleena doesn’t protect you from Sexually Transmitted Infections. In order to avoid that, you need to use a women’s condom.