Shares in Israeli pharmaceutical giant Teva dropped by more than 11% in early trading on the Tel Aviv Stock Exchange on Sunday morning.As of 10:22 a.m., shares had fallen from a pre-weekend closing price of NIS 52.25 to NIS 46.45.The company is currently the subject of a massive lawsuit in the US for an alleged generic drug price-fixing scheme, filed on Friday by prosecutors from 44 US states.