Nexplanon is extremely effective without pulling out. It is the single most effective reversible contraceptive available, with a real-world pregnancy rate of roughly 0.04 per 100 users per year. That means fewer than 1 in 2,000 users get pregnant annually. You do not need withdrawal, condoms, or any backup method for Nexplanon to work at its full effectiveness.
How Effective Nexplanon Actually Is
Most contraceptives have two numbers: a “perfect use” rate and a “typical use” rate. Nexplanon is unusual because those numbers are essentially the same. Once the implant is in your arm, there’s nothing to forget, mistime, or mess up. You can’t use it wrong.
A large U.S. study tracking over 7,300 Nexplanon users (the NORA study) found only 3 pregnancies that occurred while the implant was actually in place. That translates to a Pearl Index of 0.02, meaning about 2 pregnancies per 10,000 women per year. For comparison, the pill has a typical-use failure rate of about 7 per 100 users per year, and condoms fail about 13 per 100. Nexplanon is in a completely different category.
The FDA recently extended Nexplanon’s approved duration from 3 years to 5 years, based on a clinical trial of 394 women tracked through years 4 and 5. Across nearly 7,000 at-risk menstrual cycles where participants had sex without any additional contraception, zero pregnancies occurred. The implant doesn’t fade meaningfully over time within that window.
Why Withdrawal Isn’t Necessary
Nexplanon works through three separate mechanisms. It stops ovulation, so there is no egg to fertilize. It thickens cervical mucus, making it difficult for sperm to reach the uterus. And it changes the uterine lining in ways that make implantation unlikely. These effects run continuously, 24 hours a day, for the life of the implant.
Because ovulation itself is suppressed, the question of whether sperm reaches the egg is largely moot. Pulling out adds a theoretical extra layer of protection, but it’s layering protection on top of a method that already prevents pregnancy more than 99.9% of the time. The clinical trials that produced Nexplanon’s effectiveness numbers specifically counted only cycles where women had unprotected intercourse with no backup method. The numbers you see already reflect sex without pulling out.
The Few Situations That Can Reduce Effectiveness
While Nexplanon is nearly bulletproof under normal circumstances, a few specific situations can lower its reliability.
Timing of insertion. If the implant is placed during days 1 through 5 of your menstrual period, it works immediately. If it’s inserted at any other point in your cycle, you need to use a backup method like condoms for 7 days while the hormone reaches effective levels. After that initial week, you’re fully protected.
Certain medications. Some drugs speed up how quickly your liver breaks down hormones, which can lower the amount of active hormone in your bloodstream. The main culprits are certain seizure medications, some HIV treatments, and the herbal supplement St. John’s Wort. If you take any of these regularly, the implant may not suppress ovulation as reliably. This is worth bringing up with whoever prescribes your medications.
Improper placement. In rare cases, an implant isn’t inserted correctly or migrates after placement. This is why your provider will ask you to feel the implant in your arm after insertion. If you can feel the small rod under your skin, it’s working. If you ever can’t locate it, that’s a reason to follow up.
How Nexplanon Compares to Pulling Out Alone
Withdrawal on its own has a typical-use failure rate of about 20 per 100 users per year, meaning roughly 1 in 5 couples relying solely on pulling out will experience a pregnancy within a year. Even with perfect execution every single time, the failure rate is around 4 per 100.
Nexplanon’s failure rate of 0.02 to 0.04 per 100 makes it roughly 100 to 1,000 times more effective than withdrawal, depending on how consistently someone pulls out. Adding withdrawal to Nexplanon doesn’t meaningfully change your odds. You’re already at the statistical floor for pregnancy prevention.
Protection Over Five Years
The FDA’s 2024 approval for extended use means Nexplanon now lasts up to 5 years. The trial supporting this extension was specifically designed to catch any drop in effectiveness: researchers tracked only cycles where women had unprotected sex without any other contraception. Zero pregnancies occurred across nearly 7,000 of those cycles during years 4 and 5. No new safety concerns emerged during the extended timeframe either.
If your implant has been in place for fewer than 5 years and you can feel it in your arm, it is working. You do not need to pull out, and you do not need a backup method.