AcelRx Pharmaceuticals, Inc., a specialty pharmaceutical company, develops and commercializes therapies for the treatment of acute pain. The company’s lead product candidate is Zalviso, an investigational, pre-programmed, non-invasive, handheld system that has completed Phase III clinical trials for the treatment of moderate-to-severe acute pain in the hospital setting. The company is also developing ARX-04, a sufentanil single-dose tablet, which has been planned to initiate Phase III clinical trials for the treatment of moderate-to-severe acute pain to be administered by a healthcare professional to a patient in settings of acute pain, such as in the emergency room, hospital floor, ambulatory care facilities, or on the battlefield. In addition, its product candidate pipeline consists of ARX-02, a pain management system that has completed Phase II clinical trials for the treatment of cancer patients who suffer from breakthrough pain; and ARX-03, a single, fixed-dose, and combination drug product, which has been completed Phase II clinical trial designed to provide mild sedation, anxiety reduction, and pain relief for patients undergoing painful procedures in a physician’s office. The company was formerly known as SuRx, Inc. and changed its name to AcelRx Pharmaceuticals, Inc. in August 2006. AcelRx Pharmaceuticals, Inc. was founded in 2005 and is headquartered in Redwood City, California.