Sronyx is used to prevent pregnancy. For a woman to get pregnant, an egg is released from the ovary, where it swims to the fallopian tube for fertilization. Sronyx prevents the egg from being released from the ovary. It also affects the uterine lining which makes it hard for a fertilized egg to attach and end up passing out of the body. Do not use this drug if you are already pregnant or if you have recently given birth.