Estradiol sulfate
As the sodium salt, sodium estradiol sulfate, E2S is present as a minor constituent (0.9%) of conjugated equine estrogens (CEEs), or Premarin. It effectively functions as a prodrug to estradiol in this preparation, similarly to E1S. E2S is also formed as a metabolite of estradiol, as well as of estrone and E1S. Aside from its presence in CEEs, E2S is not available as a commercial pharmaceutical drug.
Ethinylestradiol
EE has been marketed as a standalone oral drug under the brand names "Esteed", "Estinyl", "Feminone", "Lynoral", "Menolyn", "Novestrol", "Palonyl", "Spanestrin", and "Ylestrol" among others, although most or all of these formulations are now discontinued. It is marketed under a very large number of brand names throughout the world in combination with progestins for use as an oral contraceptive. In addition, EE is marketed in the in combination with norelgestromin under the brand names "Ortho Evra" and "Xulane" as a contraceptive patch, in combination with etonogestrel under the brand name "NuvaRing" as a contraceptive vaginal ring, and in combination with norethisterone acetate under the brand name "FemHRT" in oral hormone replacement therapy for the treatment of menopausal symptoms.