twenty-three adult patients with chronic pain due to cancer completed a double-blind , randomized , two-phase crossover trial comparing plasma morphine concentrations and analgesic efficacy of oral morphine sulfate solution ( mss ) and controlled-release morphine sulfate tablets ( ms contin [ msc ] , purdue frederick , inc. , toronto , ontario , canada ) .
C0066814
morphine sulfate
C0700786
ms contin