An experimental drug that relieves pain like morphine but is not addictive showed promise in a study of mice, the Los Angeles Times reports.
Stanford University researchers gave one group of mice the compound, called PZM21. A second group was given morphine. Both groups of mice were placed on a hot surface. PZM21 offered almost as much pain relief as morphine, and lasted for up to three hours—substantially longer than morphine, the researchers report in the journal Nature.