The 20 cm² Ortho Evra contraceptive patch contains 750 µg ethinyl estradiol (an estrogen) and 6000 µg norelgestromin (a progestin).[8] The 20 cm² Evra contraceptive patch contains 600 µg ethinyl estradiol and 6000 µg norelgestromin.[9] The Ortho Evra contraceptive patch and the Evra contraceptive patch are both intended to gradually release into the systemic circulation approximately 20 µg/day of ethinyl estradiol and 150 µg/day of norelgestromin.[8][9]