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contraceptive patch
A contraceptive patch is a transdermal patch applied to the skin that releases synthetic estrogen and progestin hormones to prevent pregnancy. They have been shown to be as effective as the combined oral contraceptive pill with perfect use, and the patch may be more effective in typical use.〔Contraceptive Technology, Chapter 12, Contraceptive Patch and Vaginal Contraceptive Ring, by Kavita Nanda, page 272〕
The only currently available contraceptive patches are Ortho Evra, marketed in the United States by Ortho-McNeil, and Evra, marketed in Canada by Janssen-Ortho and in the United Kingdom and other countries by Janssen-Cilag. The patches are packaged in boxes of three and are only available by prescription. The contraceptive patch is often informally referred to as "the Patch."
==Method of use==
A woman applies her first patch onto her upper outer arm, buttocks, abdomen or thigh on either the first day of her menstrual cycle (day 1) or on the first Sunday following that day, whichever she prefers. The day of application is known from that point as ''patch change day''. Seven days later, when ''patch change day'' comes again, the woman removes the patch and applies another to one of the approved locations on the body. This process is repeated again on the next ''patch change day''. On the following ''patch change day'', the patch is removed and not replaced. The woman waits 7 days without a patch in place, and on the next ''patch change day'' she applies a new patch. Extended use regimens, where patches are used for several weeks before a patch-free week, have been studied.
The patch should be applied to skin that is clean, dry, and intact. This means, if skin is red, irritated, or cut, the patch should not be placed in that area. Additionally, avoid using lotions, powder, or makeup around the area where the patch is, or will be placed.〔Mayo Clinic (2010). "Ortho Evra (Contraceptive Patch)." Retrieved from http://www.mayoclinic.com/health/ortho-evra/MY01006/DSECTION=what-you-can-expect, on February 3, 2011.〕
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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