Implanon, also known as “the rod” or a “the contraceptive implant,” is a widely used form of long-acting reversible contraception (LARC). It is typically recommended for removal or replacement after three years, but recent peer-reviewed studies suggest that Implanon’s effectiveness may extend beyond this period. Understanding the longevity and effectiveness of Implanon is crucial for those relying on it to lower their pregnancy chance.
If you’re curious how Implanon effects your unique pregnancy chances, try our free Contraceptive Risk Calculator, it’s based on peer reviewed science!
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Understanding Implanon: How It Works
Implanon is a small, flexible rod inserted under the skin of the upper arm. It releases etonogestrel, a synthetic form of the hormone progesterone, which prevents pregnancy by inhibiting ovulation, thickening cervical mucus to block sperm, and thinning the uterine lining to prevent implantation.
Current Guidelines: Removal and Replacement
The manufacturers of Implanon and similar contraceptive implants recommend removing and replacing the implant after three years. This guideline is based on the duration for which the implant has been formally tested and approved for use.
Extended Effectiveness: What the Research Shows
Recent research challenges the need for such frequent replacement. Several studies have shown that Implanon remains highly effective for up to four or even five years after insertion. A key study published in the journal Contraception found that the failure rate of Implanon remained very low even in the fourth and fifth years of use.
A particularly important study, titled “Extended use up to 5 years of the etonogestrel-releasing subdermal contraceptive implant: comparison to levonorgestrel-releasing subdermal implant,” led by Moazzam Ali and colleagues, investigated the extended use of the etonogestrel (ENG)-releasing subdermal contraceptive implant (Implanon). This research, conducted by the WHO study group on subdermal contraceptive implants, found that the ENG implant maintained 100% efficacy in years four and five, demonstrating that the implant can be safely and effectively used for up to five years without a significant increase in the risk of pregnancy .
Why Is This Important?
Understanding the extended effectiveness of Implanon can lead to fewer unnecessary replacements, reducing the risk of complications associated with the procedure and offering more convenience for users. For those who prefer to minimize medical interventions, the knowledge that Implanon can be effective for at least three years—if not longer—can be empowering.
What This Means for You
If you are using Implanon or considering it as a contraceptive option, it’s essential to discuss the latest research with your healthcare provider. They can help you decide whether to follow the standard replacement schedule or extend the use based on your individual needs and circumstances.
In our Pregnancy Chance Calculator, Implanon and other contraceptive implants are referred to as “the rod” or “contraceptive implant.” While the calculators do not account for the exact duration of implant use, they are designed to provide estimates based on the type of contraceptive used, age, and other general factors.
Conclusion
Implanon remains one of the most effective contraceptive methods available, with emerging research suggesting that its efficacy may extend beyond the currently recommended replacement period. By staying informed about the latest scientific findings, you can make better decisions about your reproductive health and contraception.
References
- Moazzam Ali, Ayse Akin, Luis Bahamondes, et al. “Extended use up to 5 years of the etonogestrel-releasing subdermal contraceptive implant: comparison to levonorgestrel-releasing subdermal implant.” WHO Study Group on Subdermal Contraceptive Implants. Link to study