A drug newly approved for fighting a painful and fertility-threatening condition among millions of women also may help treat premenstrual syndrome, benign breast tumors and other ailments, doctors say.

The drug, Lupron Depot, was approved by the federal Food and Drug Administration this week for treating endometriosis, a sometimes painful condition that occurs when tissue lining the womb migrates to the abdomen and pelvis. If it develops in the ovaries or fallopian tubes it can cause blocking, scarring and infertility.Lupron Depot previously had been approved only for use as a prostate-cancer medicine, but doctors had for years prescribed it to women suffering from endometriosis because they knew it worked.