Etynodiol (INN), or ethynodiol (BAN) is a steroidal progestin related to norethisterone which was never marketed. While etynodiol is sometimes used as a synonym for etynodiol diacetate, it usually refers to etynodiol diacetate (see [DB00823]), not etynodiol.

Levonorgestrel (LNG) is a synthetic progestogen similar to [Progesterone] used in contraception and hormone therapy.[A181988,T659] Also known as Plan B, it is used as a single agent in emergency contraception, and as a hormonal contraceptive released from an …

Lynestrenol is a progestin and prodrug of [norethisterone].

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Norethisterone, also known as norethindrone, is a synthetic progestational hormone belonging to the 19-nortestosterone-derived class of progestins.[A10367] It is further classified as a second-generation progestin, along with [levonorgestrel] and its derivati…