Birth control pills (oral contraceptives) are prescription medications that prevent pregnancy. Three combinations of birth control pills that contain progestin and estrogen are 1) monophasic, 2) biphasic, and 3) triphasic. Birth control pills may also be prescribed to reduce menstrual cramps or prevent anemia.
Oral contraceptives are hormonal preparations that may contain combinations of the hormones estrogen and progestin or progestin alone. Combinations of estrogen and progestin prevent pregnancy by inhibiting the release of the hormones luteinizing hormone and follicle stimulating hormone from the pituitary glandLH and FSH play key roles in the development of the egg and preparation of the lining of the uterus for implantation of the embryo.
For birth control pills that use consecutive numbers, the first tablet is taken on the first day of the menstrual period . Tablet #2 is taken on the second day and so on. For the 28-day units, tablets containing medication are taken for 21 consecutive days, followed by a seven-day period during which placebo tablets are taken.
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