Induction of luteolysis in the human with a long-acting analog of luteinizing hormone-releasing factor.

Subcutaneous injection of 50 micrograms of a long-acting analog of luteinizing hormone-releasing factor on each of two successive days during mid-luteal phase in normally cycling women induced a short luteal phase and premature menstruation. These events were associated with luteolysis, as evidenced by the consistent and parallel premature decline of progesterone and estradiol levels compared with those in control cycles. This finding may prove to be useful in the prevention or interception of implantation.