Women who can’t tolerate estrogen often turn to progestin-only pills such as Errin. Errin prevents pregnancy by thickening the vaginal fluid and changing the uterine lining so that it’s difficult for sperm to reach the egg and a fertilized egg to attach to the uterus. About half of the women who take Errin stop ovulating.
Camila is a mini-pill that prevents pregnancy using a form of progestin known as norethindrone. This hormone thickens the vaginal fluid so that it’s more difficult for the sperm to reach the egg. It also changes the lining of the uterus so that an egg, if fertilized, would have trouble attaching to the uterus. In roughly half of the patients taking Camila, this medication will prevent eggs from being released.