This contains two active ingredients- Ethinylestradiol and Drospirenone. Ethinylestradiol is a synthetic version of estrogen and Drospirenone is a synthetic form of progesterone. The hormonal components of this preparation inhibit ovulation by suppressing gonadotropin release. Secondary mechanisms, which may contribute to the effectiveness of this tablet as a contraceptive, include changes in the cervical mucus (which increase the difficulty of sperm penetration) and changes in the endometrium (which reduce the likelihood of implantation).