Hydrocodone belongs to the narcotics class of drug; it acts on the central nervous system of the human brain and spinal cord and helps to numb the pain receptors. In this way, it acts as a powerful analgesic (pain reliever). Hydrocodone is given in intense pain, such as severe pain where opioid treatment is required.But the problem with hydrocodone is that it is a habit-forming drug, which means that with the prolonged use of this medication, the patient will get used to it.