Two generic drug manufacturers have been subpoenaed in a federal probe into price hikes. The Justice Department is seeking information from the two firms on their interactions with competitors. Generic drugs have seen a major price jump over the past year. A medication for congestive heart failure, digoxin, now costs more than $1 per pill, up from just 11 cents two years ago. The price for an antibiotic brand went from $20 per bottle last fall to over $1,800 today. Independent Senator Bernie Sanders has submitted questions to 14 pharmaceutical companies ahead of a Senate hearing on generic drug pricing next week.