9-deoxy-9-methylene PGE2 is a stable, isosteric analog of PGE2. 9-deoxy-9-methylene PGE2 retains the biological profile of PGE2 with fewer side effects. In the rat 9-deoxy-9-methylene PGE2 is equipotent to PGE2 in decreasing blood pressure. It also stimulates the gerbil colon and primate uterus at the same potency as PGE2.{464}