Norplant 1 is expected to be effective up to:
Norplant 1 contains 6 silastic capsules of which each contains 36 microgram of levonorgestrel. It is expected to be effective for up to 5 years. Ref: Shaw's Textbook of Gynaecology, 12th Edition, Page 179.
2 years
5 years
7 years
9 years