612 women had the benefit of contraceptive implants in the Maternity Hospital of La Rabta in Tunis over a period of 5 years (1988-1992). This study aimed at analysing the tolerance of this method by studying a group of 508 normal women and 104 women at risk (58 women were heart-diseased, 22 nursing, 13 diabetic, 11 hypertensive). The typical woman in this group is thirty years old, having 3 children, and weighing 61 kg. The implants were most of the cases withdrawn because of problems related to the menstrual cycle that were observed in 37% of the cases, equally distributed among both groups of the series. Contraceptive implants failed in 1.79% of the cases.