Mifepristone may be the least marketed pharmaceutical product in the U.S. There aren’t any ads for it on TV. Most doctors can’t prescribe it. Pharmacists don’t know much about it, since it doesn’t sit on the shelves at CVS or Walgreens. It would be reasonable to assume this is all because mifepristone is exceptionally dangerous. But it sends fewer people to the ER than Tylenol or Viagra. It’s also highly effective when used as intended: to induce an abortion.