The objective of this single-dose, open-label, randomized, two-treatment, two-period crossover study was to compare the relative bioavailability of a test formulation of KADIAN (2 x 10 mg) capsules manufactured by Alpharma Inc. to an equivalent oral dose of the commercially available reference product, KADIAN (1 x 20 mg)capsules manufactured by Alpharma Branded Products Inc.. Following an overnight fast of at least 10 hours, subjects consumed a standard high-calorie, high-fat breakfast meal that began 30 minutes prior to each dose.