San Mateo-based Epocrates, a provider of drug reference information via mobile phones, has re-filed for an IPO. The firm said it is looking to raise up to $75M on the NASDAQ Global Market under the symbol "EPOC". The IPO is being underwritten by J.P. Morgan, Piper Jaffray, William Blair & Company, and JMP Securities. The firm is backed by Sprout Capital, Goldman Sachs, InterWest Partners, Draper Fisher Jurvetson, Three Arch partners, and Bay City Capital.