<prompt> Norplant 1 is expected to be effective up to:2 years5 years7 years9 years  <response>: 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: Shaws Textbook of Gynaecology, 12th Edition, Page 179. 