Wikipedia
NuvaRing is the trade name for a combined hormonal contraceptive vaginal ring manufactured by Merck (formerly Schering-Plough, formerly Organon) that is available by prescription. It is a flexible plastic ( ethylene-vinyl acetate copolymer) ring that releases a low dose of a progestin and estrogen over three weeks. It is currently used by approximately 1.5 million women worldwide.
A recent study found that users of vaginal rings with ethinyl estradiol and etonogestrel have a 6.5 times increased risk of venous thrombosis compared to non-users. This is commensurate with the risk of thrombosis due to the use of combined oral contraceptive pills, which in studies ranged between 2.9 times to 13.7 times the risk.
A number of lawsuits have been filed alleging the companies involved concealed the health risks associated with using the NuvaRing, which are currently being settled for $100,000,000.