How does Twirla (the birth control patch) work?

Twirla works the same way all combined hormonal birth control pills work. Twirla (levonorgestrel and ethinyl estradiol birth control patch) lowers the risk of becoming pregnant by preventing the release of an egg from the ovary (ovulation)and it also thickens the cervical mucus, helping to block the sperm from getting into the uterus and connecting with the egg.