This combination medication is used to relieve moderate to severe pain. It contains an opioid pain reliever (hydrocodone) and a non-opioid pain reliever (acetaminophen). Hydrocodone works in the brain to change how your body feels and responds to pain. Acetaminophen can also reduce a fever. Along with its needed effects, a hydrocodone online medicine may cause some unwanted effects. Although not all of these side effects may occur, if they do occur they may need medical attention. Check wi...