See also Warning section. This combination medication is used to help relieve moderate to severe pain. It contains an opioid pain reliever (dihydrocodeine), a non-opioid pain reliever (acetaminophen), and caffeine. Dihydrocodeine works in the brain to change how your body feels and responds to pain. Acetaminophen can also reduce a fever. Caffeine increases pain relief, especially for certain types of headaches.