Morphine may make pain last longer
Rat study suggests further drawback to opioids
![OxyContin](https://i0.wp.com/www.sciencenews.org/wp-content/uploads/2016/05/052716_ls_opioid_free.jpg?fit=860%2C460&ssl=1)
PAIN PILLS Morphine treatment extended the duration of nerve pain in rats, a result that raises questions about the effects of other opioid-based painkillers, such as OxyContin.
ZUMA Press Inc./Alamy