NuvaRing was approved for use as in birth control October of 2001. NuvaRing is considered a third generation combination hormonal contraceptive.
There are ongoing lawsuits due to the side effects of the contraceptive which include risks of blood clots, stroke.
You should always research any medications before having them prescribed for you.
Here are a few more side effects of the NuvaRing birth control.

Deep Vein Thrombosis
Pulmonary Embolysm
Heart Attack
Death

To find more information on this type of birth control click here NuvaRing