Hydrocodone is a generic medicine that has been buy hydrocodone online approved by the FDA and is sold under the brand names Norco and Vicodin. It is an opioid medication that is used to treat moderate to severe pain in humans. It contains an opioid called Hydrocodone as well as a non-opioid called Acetaminophen. Hydrocodone acts on the brain and spinal cord by blocking pain signals, whereas acetaminophen reduces fever.