Colombian Family planning programs have increased modern methods like Norplant. The Instituto Materno Infantil, had Norplantprogram from1984 to 1986 but in 1992 with the support of the PHO began a new program. Now we have 1000 patients with Norplant. Objective: To evaluate Norplant efficiency, tolerance, acceptability and side effects. Results: Most of patients had between 16-33 years old and had between 1-3 children. Norplant efficiency was 98.6%. There were seven ectopic pregnancy (50% of failure). The main side effects were irregular menstrual bleeding and headache. 17% of implants have been removed. 91.9% were satisfied and continuity rate was 94% in the first year and 78% at the end of the fourth year. Conclusion: Norplant is a safe and effective hormonal method. Counseling is necessary before Norplant use. It is necessary to improve Not-plant knowledge in physicians in order to offer better medical counseling.