Doctors Margaret Gary of Michigan and Donna Harrison of Virginia said the FDA's Adverse Event Reporting system recorded 607 adverse incidents resulting from bleeding or septic shock as well as unusual allergic reactions during a four-year period.
The researchers also said at least five deaths in the United States and Canada have been linked to RU-486 and questioned whether the FDA system adequately identifies risks from the drug also marketed under the brand name Mifeprex.
The doctors, who also are listed as participating physicians on the Web site of the American Association of Pro Life Obstetricians and Gynecologists, called for more research into fatal septic reactions associated with mifepristone.
The study was reported in The Annals of Pharmacotherapy Online.
Starbucks testing a latte that tastes like beer
GM recalls 221,000 Cadillacs and Impalas