Katya is a medication that contains the active ingredient desogestrel, a synthetic hormone that prevents ovulation and changes the cervical mucus and uterine lining to make it harder for sperm to reach the uterus and for a fertilized egg to attach to the uterus. This contraceptive pill is suitable for women who want to prevent pregnancy by inhibiting ovulation and altering the cervical mucus consistency, making it more difficult for sperm to reach the egg.