虽然避孕药的名称没有变，发挥的作用（抑制排卵）也没有变，但是今天的避孕药已大不同于早期的避孕药。早期的避孕药含有 150微克雌激素和 10克孕酮。现在生产的口服避孕药的雌激素含量降低了 80％，孕激素（合成孕酮）降低了 90％。今天的避孕药已经不再有早年避孕药诸如增加 Although the name of the contraceptive has not changed, the role it plays (suppression of ovulation) has not changed, but today’s contraceptives are vastly different from those of earlier birth control pills. Early contraceptives contain 150 micrograms of estrogen and 10 grams of progesterone. Oral contraceptives now produced have a 80% reduction in estrogen and a 90% reduction in progestin (synthetic progesterone). Today’s contraceptives no longer have early contraceptives such as increased