Excerpt from the full fact sheet:

Mifepristone (RU 486) has been proven safe.  Approximately 650,000 women in the United States have used mifepristone since its FDA approval. The adverse drug event rate for mifepristone is just 0.26 percent. In other words, fewer than three out of every 1,000 women who use mifepristone have any adverse event.

Despite the proven safety of mifepristone, anti-choice activists and lawmakers who believe that abortion should be outlawed entirely are trying to remove mifepristone from the market.

Download the fact sheet (PDF)