Erin Magner, February 7, 2019
“There are four kinds of hormonal IUDs, whose names read like the cast of a Disney Channel movie: Mirena, Skyla, Liletta, and Kyleena. They all contain a synthetic hormone called progestin, which is similar to the progesterone our bodies produce, says Kecia Gaither, MD, MPH, FACOG—a doctor who’s double board-certified in OB/GYN and maternal fetal medicine. The difference between each option is the amount of progestin it contains and the length of time it remains effective (up to seven years, says Dr. Gaither). “They work by making cervical mucus thicker and preventing ovulation—so, in essence, sperm can’t get through the thick mucus, nor does ovulation occur,” she says.”
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