想要防止计划外妊娠的妇女将会发现没有一种方法比人口理事会推广的新方法更有效，那就是两根型左旋－18甲基炔诺酮埋植剂。这一安全、长效的避孕产品最近已被美国FDA批准（作为三年期使用）。此埋植剂的失败率在所有已注册避孕药具中是最低的：在三年多的时间内，每1000个使用 Women who want to prevent unplanned pregnancies will find that none of the methods are more effective than the new approach popularized by the Population Council, that is, two types of L-18 norepinephrine implants. This safe and long-lasting contraceptive product has recently been approved by the U.S. FDA for its three-year use. The failure rate of this implants is the lowest among all registered contraceptives: for every 1000 uses over a three-year period