When Nexplanon reaches its expiration date, the implant doesn’t suddenly stop working like a switch flipping off. The hormone level has been gradually declining for years, and by the time the device expires, it’s releasing a fraction of what it started with. You’re not immediately unprotected the day it expires, but your pregnancy risk does begin to climb, and your body may start signaling the hormonal shift with noticeable symptoms.
How Hormone Levels Change Over Time
Nexplanon works by steadily releasing a synthetic progestin into your bloodstream. In the first weeks after insertion, the implant releases about 60 to 70 micrograms per day. That rate drops considerably: by the end of year one, it’s down to roughly 35 to 45 micrograms per day. By the end of year two, it’s 30 to 40 micrograms. By year three, the original expiration point, you’re getting about 25 to 30 micrograms daily.
This gradual taper is important context. The implant doesn’t “run out” all at once. It’s more like a slow fade, which means contraceptive protection weakens over time rather than disappearing on a single date. That said, past the labeled duration, hormone output continues to drop, and there’s a point where it’s no longer enough to reliably prevent ovulation.
Does It Still Prevent Pregnancy Past 3 Years?
In 2024, the FDA extended Nexplanon’s approved duration from 3 years to 5 years, based on clinical data showing zero pregnancies during years 4 and 5 of use. The pregnancy rate across the extended period was 0.0 per 100 women-years. So if your implant was placed relatively recently and you’re in the 3-to-5-year window, the evidence suggests it’s still highly effective.
If your implant is older and was placed before this label change, your provider may have told you it expires at 3 years. The updated data applies to the same device, so the protection likely extends regardless of when it was inserted. Still, once you’re past the 5-year mark, there’s no clinical data confirming effectiveness, and the declining hormone levels mean pregnancy becomes a real possibility.
What You Might Feel as It Winds Down
As hormone output drops, some people notice changes that feel a lot like what happens when you stop any hormonal birth control. The most common shifts include:
- Irregular bleeding or spotting: Your body may start cycling again unpredictably as progestin levels fall below the threshold that was suppressing your natural cycle.
- Abdominal cramping: Menstrual-type pain can return as ovulation resumes.
- Mood changes and insomnia: Fluctuating hormones during the transition can affect sleep and emotional regulation.
- Hot flashes: Some people experience temperature regulation issues as their body adjusts.
These symptoms are typically temporary. They reflect your body recalibrating to its own hormone production after years of external progestin. Most people find them manageable and short-lived, lasting weeks rather than months.
How Quickly Fertility Returns
Ovulation can resume surprisingly fast. According to the manufacturer, pregnancy is possible as early as one week after Nexplanon is removed. When the implant simply expires in place (without removal), the timeline is less precise because the hormone decline is gradual rather than abrupt. But once levels drop low enough, your ovaries can release an egg without much delay.
If you’re not planning a pregnancy, this matters. You could ovulate before you realize the implant is no longer protecting you, especially since there’s no obvious signal that it’s “stopped working.” If you’re past the 5-year mark and sexually active, use a backup method until you either replace the implant or switch to something else.
Is It Safe to Leave an Expired Implant in Your Arm?
An expired Nexplanon isn’t dangerous to leave in place for a while. The rod itself is biocompatible, meaning your body tolerates the material without a toxic or inflammatory reaction. It won’t poison you or cause an infection just because the hormones have run low.
That said, leaving it indefinitely isn’t ideal. Over many years, tissue can grow more firmly around the implant, which can make eventual removal more difficult. The longer it stays, the harder the extraction procedure can be, sometimes requiring a deeper incision or imaging to locate the rod. If you know you’re past expiration, scheduling removal sooner rather than later keeps the process simple.
What Removal and Replacement Involve
Removal is a quick office procedure, usually taking just a few minutes. Your provider numbs the area around the implant, makes a small incision, and pulls the rod out. If you want to continue with this method, a new implant can be inserted through the same incision in the same visit.
Under the Affordable Care Act, most insurance plans cover the implant itself, including insertion and the device, with no copay. However, removal fees and other procedure-related costs may or may not be fully covered depending on your specific plan. It’s worth calling your insurer before your appointment to confirm what you’ll owe, especially if you’re replacing the implant at the same time.
The Practical Takeaway
If your Nexplanon is between 3 and 5 years old, the updated FDA data is reassuring: it’s still effective. If it’s older than 5 years, assume your pregnancy protection is unreliable and use backup contraception. The implant won’t harm you by staying in your arm, but getting it removed on time avoids both unintended pregnancy and a potentially more complicated removal down the road.