“…Food and Drug Administration approved dinoprostone (PGE2) vaginal (Propess TM Dinoprostone vaginal delivery system, FerringIlac Sanayi, Istanbul, Turkey) in 1995 for cervical ripening, which releases 10 mg of dinoprostone over 12 hours. The effects and properties of PGE2 (dinoprostone) have been investigated and there are many studies in the literature comparing the efficacy of the different formulations available in the market [8][9][10][11][12][13][14][15][16][17][18]. Unfortunately, many of these studies were conducted without regard to parity [9,10,12].…”