The invention is related to an improved method of contraception, for preventing or suppressing abnormal and/or irregular endometrial bleeding and achieving a rapid induction of amenorrhea by using an intrauterine delivery system comprising pro-gestogen or a drug having a progestogenic activity for the controlled release over a prolonged period of time and at a therapeutic level required for contraception, and a sufficient amount of one or more therapeutically active substances capable of suppressing abnormal and/or irregular endometrial bleeding.
