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2004 AUG 5 - (NewsRx.com & NewsRx.net) -- New delivery systems in contraception include vaginal rings.
"Vaginal rings, made of soft flexible silicone rubber, for delivery of contraceptive hormones are currently gaining clinical acceptance. This method provides extended release of hormones, which are implanted in the core of the ring and slowly disseminate into vaginal tissue. Although formulations and sizes vary, most rings are approximately 58 mm in diameter with a cross-section of 8.4 mm. Depending on the type of ring used, prolonged hormone release may occur from three weeks to one year," scientists in the United States report.
"Advantages of the vaginal ring method are that it is user controlled, does not interfere with intercourse, does not require daily intake of a pill, and allows continuous delivery of a low dose of steroids," said Elof D. B. Johansson and Regine Sitruk-Ware at the Population Council in New York. "The Population Council has developed a progesterone-releasing ring, which is currently on the market in Chile and Peru for contraception in breastfeeding women. This ring may be effective for progesterone therapy during in vitro fertilization as well. A contraceptive ring releasing very low doses of the potent progestin Nestorone for 6 to 12 months is also under investigation."
"The optimal ring formulations, however, contain hormone ...
Source: HighBeam Research, New delivery systems in contraception include vaginal rings.