Epocrates, which provides mobile drug reference tools to healthcare professionals, filed on Friday with the SEC to raise up to $75 million in an initial public offering. The San Mateo, CA-based company, which was founded in 1998 and booked $93 million in sales over the last 12 months, plans to list on the NASDAQ under the symbol EPOC. The company had previously filed for an IPO in April 2008, but shelved its offering later that year. J.P. Morgan and Piper Jaffray are the lead underwriters on the deal. No pricing terms were disclosed.