Duration of Nexplanon Use
Nexplanon is FDA-approved for 3 years of use and must be removed or replaced by the end of the third year. 1
FDA-Approved Duration
- The etonogestrel implant provides contraceptive protection for 3 years from insertion, after which it should be replaced with a new implant if continued contraception is desired. 1
- All healthcare providers must understand that the approved duration is 3 years, and the implant should be removed by the end of this period. 2
Contraceptive Efficacy During Approved Period
- Nexplanon demonstrates exceptional effectiveness with a failure rate of less than 0.05% during the 3-year approved duration, making it the most effective reversible contraceptive method available. 1
- Both typical-use and perfect-use failure rates remain less than 1% throughout the approved 3-year period. 1
Extended Use Beyond FDA Approval
While not currently recommended for standard clinical practice, emerging research suggests extended efficacy:
- Fourth year data: A prospective cohort study documented zero pregnancies among 291 implant users during the fourth year of use (444.0 woman-years of follow-up), with a calculated failure rate of 0 per 100 woman-years (95% CI: 0-1.48). 3
- Fifth year data: The same study found zero pregnancies during the fifth year, with a calculated failure rate of 0 per 100 woman-years (95% CI: 0-2.65). 3
- A separate randomized trial comparing the ENG-implant to the 5-year levonorgestrel implant found 100% efficacy in years 4 and 5, with an overall 5-year cumulative pregnancy rate of 0.6 per 100 woman-years (95% CI: 0.2-1.8). 4
Pharmacokinetic Support for Extended Use
- Serum etonogestrel levels remain above the ovulation threshold of 90 pg/mL through 5 years of use across all body mass index categories. 3
- Median etonogestrel levels at 3 years are 207.7 pg/mL, declining to 166.1 pg/mL at 4 years and 153.0 pg/mL at 5 years—all well above the threshold needed to suppress ovulation. 3
- One case report documented positive serum etonogestrel levels and contraceptive effect even 6 years after insertion. 5
Important Clinical Caveats
- Despite research evidence of extended efficacy, the FDA-approved duration remains 3 years, and this is what should guide standard clinical practice. 1, 2
- Extended use beyond 3 years is not currently recommended for routine clinical care, though the evidence suggests it may be effective for women who cannot immediately access removal or replacement. 1
- Fertility returns rapidly after removal, with etonogestrel becoming undetectable within 1 week and ovulation occurring in most women within 3-4 weeks. 6