After Roseanne Barr blamed the sleep aid Ambien for a series of racist tweets that resulted in the cancellation of her show "Roseanne" by ABC, the drug maker responded with a tweet of its own: “People of all races, religions and nationalities work at Sanofi every day to improve the lives of people around the world. While all pharmaceutical treatments have side effects, racism is not a known side effect of any Sanofi medication.”