Illustration depicting transdermal<unk> . Like all combined hormonal contraceptives, Ortho Evra / Evra works primarily by preventing ovulation. A secondary mechanism of action is inhibition of sperm penetration by changes in the cervical mucus. Hormonal contraceptives also have effects on the endometrium that theoretically could affect implantation; however, no scientific evidence indicates that prevention of implantation actually results from their use. The 20 cm2 Ortho Evra<unk>  contains 750 µg ethinylestradiol (an estrogen) and 6000 µg norelgestromin (a progestin). The 20 cm2 Evra<unk>  contains 600 µg ethinylestradiol and 6000 µg norelgestromin. The Ortho Evra<unk>  and the Evra<unk>  are both intended to gradually release into the systemic circulation approximately 20 µg/day of ethinylestradiol and 150 µg/day of norelgestromin.
Contraceptive patch
Contraceptive sponge
Heat-based contraception
Contraceptive implant
Vaginal microbicide
Rectal microbicide
Contraceptive vaginal ring
Antiseptic douche