NuvaRing is a small, flexible vaginal ring that releases two hormones to prevent pregnancy. You insert it yourself, leave it in place for three weeks, then remove it for one week. It’s one of several combination hormonal contraceptives, but instead of taking a daily pill, the ring delivers a steady, low dose of hormones directly through the vaginal lining. A generic version called EluRyng is also available.
How NuvaRing Prevents Pregnancy
The ring is made of transparent, flexible, non-biodegradable plastic and contains two synthetic hormones: a progestin (etonogestrel) and an estrogen (ethinyl estradiol). Once placed in the vagina, it releases about 0.120 mg of progestin and 0.015 mg of estrogen per day. These are very small amounts, roughly comparable to the hormone levels in a low-dose birth control pill, but delivered continuously rather than in a single daily spike.
The primary way it works is by stopping ovulation. Without an egg being released, pregnancy can’t happen. It also thickens cervical mucus, making it harder for sperm to reach the uterus, and thins the uterine lining, which makes implantation less likely. These backup mechanisms add extra protection on top of ovulation suppression.
How Effective It Is
With perfect use, meaning the ring is always inserted and removed on schedule, the failure rate is just 0.3% per year. That means fewer than 1 in 300 people using it exactly as directed would become pregnant in a given year. With typical use, which accounts for real-world slip-ups like forgetting to replace the ring on time, about 9 out of 100 people will become pregnant within the first year. The gap between those numbers reflects how much timing mistakes matter, not a flaw in the ring itself.
How to Use It
You insert the ring yourself by pinching it between your fingers and sliding it into the vagina, similar to inserting a tampon. The exact position doesn’t matter much. The vaginal walls hold it in place, and the hormones absorb through the tissue regardless of where the ring sits.
The standard schedule is straightforward: keep the ring in for three consecutive weeks (21 days), then remove it. During the ring-free week, you’ll typically get a withdrawal bleed similar to a period. After exactly seven ring-free days, you insert a new ring, even if bleeding hasn’t completely stopped. The key is removing and reinserting on the same day of the week each time.
If you insert your first ring within five days of the start of your period, it begins working immediately. If you start at any other point in your cycle, use backup contraception like condoms for the first seven days.
What If the Ring Slips Out?
The ring can occasionally slip out during tampon removal, bowel movements, or intercourse. If it’s been out for less than three hours, rinse it with cool or lukewarm water and reinsert it. Protection against pregnancy is maintained. If it’s been out for longer than three hours, reinsert it but use a backup method of contraception for seven days, since the hormone levels may have dropped enough to allow ovulation.
Common Side Effects
Because NuvaRing uses the same class of hormones as combination birth control pills, the systemic side effects overlap significantly: headaches, nausea, breast tenderness, mood changes, and changes in sex drive. Most of these are mild and tend to settle down within the first two or three months of use as your body adjusts to the hormone levels.
There are also side effects specific to the ring’s location. Some users notice increased vaginal discharge, vaginal irritation, or a feeling of pressure. Partners sometimes report feeling the ring during intercourse, though the ring can be temporarily removed for up to three hours without losing effectiveness if this is bothersome.
Serious Risks to Know About
Like all combination hormonal contraceptives, NuvaRing carries an increased risk of blood clots, including deep vein thrombosis (clots in the legs) and pulmonary embolism (clots in the lungs). This risk is small for most people but rises substantially with certain factors: smoking, being over 35, obesity, a personal or family history of clotting disorders, high blood pressure, diabetes with vascular complications, or prolonged immobilization after surgery.
The combination of smoking 15 or more cigarettes per day and being over 35 is the single biggest red flag. The FDA label carries a boxed warning about this specific combination because the cardiovascular risk becomes serious enough that the ring should not be used at all. Stroke and heart attack risk also increase in people with migraines accompanied by visual disturbances or other neurological symptoms.
NuvaRing is not appropriate for people with a history of breast cancer, active liver disease, liver tumors, or undiagnosed abnormal vaginal bleeding.
Storage and Shelf Life
Before you use it, NuvaRing should ideally be stored in a refrigerator. Pharmacies typically keep their supply refrigerated. Once you bring it home, you can store it at room temperature for up to four months. If it sits at room temperature longer than that, the hormones may degrade enough to reduce effectiveness. Don’t store it in direct sunlight or in hot environments like a car glove compartment.
How It Compares to the Pill
The biggest practical advantage over daily pills is that you only have to think about it twice a month: once to put it in, once to take it out. This reduces the chance of user error that comes with remembering a pill at the same time every day. The hormone levels also stay more consistent throughout the day compared to the peak-and-valley pattern of oral pills, which some people find reduces side effects like nausea.
The hormones themselves are nearly identical to those in many combination pills, so the overall safety profile, effectiveness, and side effects are similar. The choice between the two often comes down to personal preference. Some people prefer not having a daily routine; others prefer not having a device inside them. Neither approach is medically superior for most people.