Etonogestrel levels undetectable within one week. >90 percent of subjects ovulated within one month of post-removal; 44 of 47 women who were studied with ultrasound and hormone levels.
Data from: Davies GC, Feng LX, Newton JR, et al. Release characteristics, ovarian activity and menstrual bleeding pattern with a single contraceptive implant releasing 3-ketodesogestrel. Contraception 1993; 47:251 and Croxatto HB, Makarainen L. The pharmacodynamics and efficacy of Implanon®: An overview of the data. Contraception 1998; 58:91S.
