Estradiol (medication)
Estradiol is available in a variety of different formulations, including oral, intranasal, transdermal/topical, vaginal, injectable, and implantable preparations. An ester may be attached to one or both of the hydroxyl groups of estradiol to improve its oral bioavailability and/or duration of action with injection. Such modifications give rise to forms such as estradiol acetate (oral and vaginal), estradiol valerate (oral and injectable), estradiol cypionate (injectable), estradiol benzoate (injectable), estradiol undecylate (injectable), and polyestradiol phosphate (injectable; a polymerized ester of estradiol), which are all prodrugs of estradiol.
Ethinylestradiol/segesterone acetate
Ethinylestradiol/segesterone acetate (EE/SGA), sold under the brand name Annovera, is a contraceptive vaginal ring and combined form of hormonal birth control which contains ethinylestradiol, an estrogen, and segesterone acetate, a progestin. It contains 17.4 mg ethinylestradiol and 103 mg segesterone acetate, releases an average of 13 μg ethinylestradiol and 0.15 mg segesterone acetate per day, and lasts for a duration of one year. The medication was developed by TherapeuticsMD and was approved for use in the United States on 10 August 2018.