The Food and Drug Administration (FDA) approved a new warning on Allergan Inc.’s Botox and a similar product about the possibility of life-threatening breathing and swallowing problems, according to recent reports. This follows an earlier advisement about stronger warnings. Along with signing off on a boxed warning for Botox and Myobloc, made by Solstice Neurosciences Inc., the agency said it was changing the generic names for both products to avoid medication errors. The formulations a...