Ortho Tri-Cyclen Lo® is a prescription oral contraceptive that contains both estrogen and progestin. These hormones prevent pregnancy by stopping ovulation, altering the lining of the uterus, and changing the cervical mucus. Ortho Tri-Cyclen Lo is a triphasic birth control pill that comes in three different "phases" in each pack. Side effects can include vomiting, nausea, and headaches.
(Click Ortho Tri-Cyclen Lo to read the complete eMedTV article, which includes information on how it works, who makes it, when you should take it, and what you should know before using the pill.)