MORRISVILLE, N.C.--(BUSINESS WIRE)--BioDelivery Sciences International, Inc. (Nasdaq:BDSI) announced the results of a 12 subject, crossover study comparing the absorption of fentanyl from both single and multiple BEMATM Fentanyl discs, as well as oral and intravenous doses of fentanyl. The data demonstrates that the absolute bioavailability (i.e. the total amount absorbed from the delivery system) of fentanyl from the BEMATM disc was more than 70%, with 50% absorbed through the buccal mucosa (the inner lining of the cheek). The study further demonstrates that equal doses administered as either a single disc or multiple discs produced identical plasma concentrations (i.e. four-200 mcg discs provided the same plasma concentrations as a single-800 mcg disc).