Search by Drug Name A B C D E F G H I J K L M N O P Q R S T U V W X Y Z Clinical Trials for NUMORPHAN Clinical trials list click for details Levorphanol as a Second Line Opioid in Reducing Pain in Patients With Cancer Open Label Assessment of Long-Term Safety and Utility Open-Label Extension to Evaluate the Long-Term Safety, Tolerability and Analgesic Efficacy