Buy Hydrocodone | Hydrocodone | Hydrocodone belongs in a group of drugs called narcotic pain relievers and is typically prescribed to treat moderate to severe pain. Hydrocodone functions in relieving pain by binding to opioid receptors in the brain and spinal cord, thus blocking pain reception.nnFirst synthesized in Germany in 1920, Hydrocodone was approved by the Food and Drug Administration (FDA) for sale in the United States in 1943.