The objective of this single-dose, open-label, randomized, two-period crossover study was to compare the rate of absorption and oral bioavailability of a test formulation of morphine sulfate 200 mg sustained-release capsules manufactured by Alpharma Branded Products Division Inc. to an equivalent oral dose of the commercially available reference product, KADIAN 2 x 100 mg capsules manufactured by Alpharma Branded Products Division Inc. when administered under fed conditions.