Levonorgestrel IUD: What It Is, How It Works, and What You Need to Know

When you hear levonorgestrel IUD, a small, T-shaped device placed in the uterus that slowly releases the hormone levonorgestrel to prevent pregnancy. Also known as a hormonal IUD, it’s one of the most effective forms of birth control available — more than 99% effective, last up to five or eight years, and doesn’t require daily action. Unlike the copper IUD, which works by creating a hostile environment for sperm, the levonorgestrel IUD changes the uterine lining and thickens cervical mucus, making it harder for sperm to reach an egg. It’s not an abortion pill. It doesn’t stop ovulation in most people, but it makes pregnancy extremely unlikely.

Many people choose the levonorgestrel IUD because it’s low-maintenance. Once it’s in, you don’t have to think about it until it’s time to replace it. But it’s not just about birth control. For those with heavy periods, painful cramps, or endometriosis, this device often brings relief. Studies show that after six months, most users have lighter bleeding or stop getting periods altogether — which isn’t dangerous, just a side effect of the hormone. It’s also used off-label for managing conditions like adenomyosis and recurrent miscarriage, though that’s not its primary purpose. The device is made of plastic and contains no estrogen, so it’s safe for people who can’t take estrogen-based pills. It’s also one of the few birth control options that doesn’t interfere with breastfeeding, making it a top pick for new moms.

But it’s not perfect. Some users report spotting in the first few months, cramping during insertion, or mood changes. Others feel fine with no side effects at all. It’s not for everyone — especially if you have certain infections, uterine abnormalities, or a history of breast cancer. And while it’s highly effective, it doesn’t protect against STIs. That’s why it’s often paired with condoms in non-monogamous relationships. The key is knowing your body and your goals. If you want long-term, hassle-free contraception with extra benefits for your cycle, the levonorgestrel IUD is worth serious consideration.

Below, you’ll find real-world guides from people who’ve used it, doctors who’ve placed it, and experts who’ve studied its long-term effects. You’ll learn how it compares to other IUDs, what to expect during insertion, how to spot trouble signs, and why some users switch away — and why others never want to take it out.