Introduced in the USA in 2001, the vaginal contraceptive
ring (NuvaRing®) is a flexible single-size
(approximately 2 inches in diameter) ring that
releases 5 mg of ethinyl estradiol and 120 mg of etonogestrel
daily.
It is worn continuously for three weeks, and then
removed for one week. The ring can also be removed
for up to three hours at a time if desired. The majority
of women in a clinical study considered insertion and
removal of the vaginal ring to be easy. The failure rate
from the study was 0.65%.
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