BioDelivery Sciences International, Inc., a specialty pharmaceutical company, engages in the development and commercialization of pharmaceutical products for chronic conditions in the United States and internationally. The company provides its products based on its patented BioErodible MucoAdhesive drug-delivery technology, a small erodible polymer film for application to the buccal mucosa, as well as other drug delivery technologies. It offers BELBUCA, a buprenorphine buccal film for the treatment of chronic pain; and Symproic, a peripherally acting mu-opioid receptor antagonist for the treatment of opioid-induced constipation in adult patients with chronic non-cancer pain, including patients with chronic pain related to prior cancer or its treatment who do not require frequent opioid dosage escalation.