美《节制生育》第19卷第6期(1979年6月)报道:对101例妇女试用了含孕酮或左旋18-甲基炔诺酮的硅橡胶植入物,作为长期避孕试验。接触植入物整3年,经2,998个妇女月之后,未发生妊娠。在使用至12个月时,连续率为87％,24个月时为79％,36个月时为66％。在第一年中,主要副作用是出血过多或不规则。除用维生素及铁剂或改变方法外,对 Volume 19, Number 6, June 1979 (June 1979) reported that 101 women with silicone rubber implants containing progesterone or levonorgestrel 18-norgestrel were used as long-term contraceptives. After 3 months of contact with the implant, no pregnancies occurred after 2,998 women’s months. At 12 months, the continuation rate was 87%, 79% at 24 months and 66% at 36 months. In the first year, the main side effect is bleeding or irregularities. In addition to using vitamins and iron or change the method, right