Estradiol tablets are not contraceptives, but are part of the estrogen class of drugs, while drospirenone tablets are part of the progestin class of drugs. For example, if a woman’s menstrual flow is low and the ultrasound reveals that the endometrium is too thin, she can take estradiol tablets to promote the proliferation of the endometrium, which will result in more menstrual flow. In addition, women with irregular periods can also be treated with estradiol tablets. Dydrogesterone tablets are a kind of progestin drug, which can be taken during pregnancy to protect the fetus, and usually women can take dydrogesterone tablets to replenish the progesterone in their body.