Ortho Tri-Cyclen (Lynoral) is an estrogen and progestin combination contraceptive pill used to prevent pregnancy. It may ... be used to regulate the menstrual cycle, treat symptoms of menopause, or treat other conditions as determined by your doctor. The dosage of Ortho Tri-Cyclen, for the initial cycle of therapy is one active tablet administered daily from the 1st day through the 21st day of the menstrual cycle. Tablets are taken with-out interruption for 21 days. Then make an interruption for 7 days. After 28 days a new course is started the next day.