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A contraceptive vaginal ring is a type of hormonal insert that is placed in the vagina for the purpose of birth control. The rings themselves utilize a plastic polymer matrix that is inlaid or embedded with contraceptive drug. This drug, often one or two hormones, is absorbed directly through the bloodstream through the cells that line the vaginal wall. Some vaginal rings contain both an estrogen and a progestin. Other vaginal rings contain just progesterone. The vaginal rings work as a long acting drug delivery system for varying indications, including prevention of pregnancy, improvement of dysmenorrhea and menorrhagia, lower risks of ovarian and endometrial cancers, and reduction of risk of cysts in the ovaries. Although the vaginal rings do not provide protection for sexually transmitted diseases, the rings are being assessed as a possible drug delivery system for HIV prevention.