The F.D.A. has now received reports that six women in the United States died after taking RU-486, or Mifeprex. A seventh died in Canada. The two most recent deaths and two of the previous four underwent their procedures at Planned Parenthood clinics, a spokeswoman said . . . Since reporting drug side effects is voluntary in the United States, it is possible that more women have died and that their deaths have gone unreported because doctors, medical examiners and coroners are not obligated to forward such reports to the F.D.A. Doctors and local officials also may not associate a death with a pill-based abortion, especially if the death occurs weeks later. (source)