When you use NuvaRing correctly, it’s great at preventing pregnancy. But forgetting to put a new ring in, taking certain medications, and other things may make it not work as well.
How effective is NuvaRing?
If you use it perfectly, NuvaRing is 99% effective. But people aren’t perfect and it can be easy to make a mistake — so in reality the ring is about 91% effective. That means about 9 out of 100 ring users get pregnant each year.
The better you are about putting a new ring in on time, the better it will work. But there’s a very small chance that you could still get pregnant, even if you always use the ring correctly.
If you want a method that’s even better at preventing pregnancy and more convenient, check out IUDs and the implant. They’re the best at preventing pregnancy and the easiest to use, since you don’t have to remember to do anything for it to work. But if you decide the ring is right for you, make sure you always put your new ring in on time so it works as well as possible.
What makes NuvaRing less effective?
The main thing that makes the ring not work is not using it correctly. That means you’re more likely to get pregnant if you don’t put your new ring in on time, or if the ring is out of your vagina for more than 2 days (48 hours) during the weeks when you’re supposed to be wearing it.
These medicines or supplements can also make NuvaRing not work as well:
• The antibiotics Rifampin, Rifampicin, and Rifamate (other antibiotics don’t make the ring less effective)
• The antifungal Griseofulvin (other antifungals don’t make the ring less effective)
• Certain HIV medicines
• Certain anti-seizure medicines (these are sometimes also used to treat psychiatric disorders like bipolar disorder)
• The herb St. John’s Wort
Your nurse or doctor can help you decide if there’s any reason NuvaRing won’t work well for you.