Benzinga's Top Pre-Market NASDAQ Gainers

Optimer Pharmaceuticals Inc OPTR shares advanced 7.86% to $14 in the pre-market session. OPTR reported that the US Food and Drug Administration (FDA) has approved its antibacterial drug Dificid to treat Clostridium difficile. The Medicines Company MDCO shares advanced 4.24% to $19.16 in the pre-market session. MDCO will replace RehabCare Group Inc RHB in the S&P SmallCap 600 index after the close of trading on June 1, 2011. Logitech International SA LOGI climbed 4.20% to $12.64 in the pre-market session. LOGI's PEG ratio is 0.96. Biosante Pharmaceuticals Inc BPAX jumped 3.78% to $3.02 in the pre-market session. BioSante completed of enrollment in its ongoing LibiGel Phase III cardiovascular and breast cancer safety study. Read more from Benzinga's Markets.