AcelRx Pharmaceuticals, Inc., a specialty pharmaceutical company, engages in the development and commercialization of therapies for the treatment of pain and other conditions. It offers NanoTab, a tablet for oral transmucosal administration. The company also provides Sufentanil NanoTab PCA system, a sublingual patient-controlled analgesia system with a drug/device combination product candidate for the management of acute post-operative pain in the hospital settings; Sufentanil NanoTab BTP management systems for the treatment option for patients with cancer pain; and Sufentanil/Triazolam NanoTab, which provides analgesia and sedation for minor outpatient procedures. It serves patients, physicians, regulators, and payers. AcelRx Pharmaceuticals, Inc. was founded in 2005 and is based in Redwood City, California.