ATC code : G03AB08 and G03FA15 (as combinations) On May 6th 2010, the FDA approved Dienogest, as a component of the oral contraceptive drug Natazia (tradename: Natazia , tradename: Qlaira ). Dienogest (research code:STS-557) is a progestin is a synthetic analog of the natural product progesterone . Dienogest is one of two active components within Natazia, the other being the 17ß-estradiol prodrug - estrogen valerate; Natazia is therefore a Combination Oral Contraceptive (or COC ). Natazia is the first four-phase combined oral contraceptive marketed in the United States - the four phases refering to the differential dosing of the estrogen/progestin throughout the menstrual cycle . Each monthly pack of Natazia contains pills to be taken in a specific order: 2 dark yellow tablets each containing 3 mg estradiol valerate; then 5 medium red tablets each containing 2 mg estradiol valerate and 2 mg dienogest; then 17 light yellow tablets each containing 2 mg estradiol valerate and...
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