Ortho Tri-Cyclen is a combination birth control pill containing the female hormones ethinyl estradiol and norgestimate. These hormones prevent ovulation (the release of an egg from an ovary).
Ortho Tri-Cyclen also causes changes in your cervical mucus and uterine lining, making it harder for sperm to reach the uterus and harder for a fertilized egg to attach to the uterus.
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