Written by Julia Malacoff on April 7, 2021
Monophasic. “These have the same amount of estrogen and progestin in each active pill in the pack,” says Kecia Gaither, MD, MPH, FACOG, a double board certified physician in OB-GYN and maternal fetal medicine. Biphasic. These change the level of hormones once within the pill pack. “The first half of the cycle, the progestin/estrogen ratio is lower. During the second half of the cycle, the progestin/estrogen ratio is higher,” Gaither explains. Triphasic. Three different doses of hormones are used in triphasic birth control pills, with the dose changing every 7 days, according to Gaither.
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