Benzinga's Top #PreMarket Losers By: Benzinga via Benzinga September 09, 2015 at 08:19 AM EDT Tetraphase Pharmaceuticals Inc (NASDAQ: TTPH) shares fell 79.57 percent to $9.15 in pre-market trading after failing to meet the ... Read More >> Related Stocks: Aquinox Pharmaceutic Flexion Therapeutics Tetraphase Pharmaceu Yahoo