Hydrocodone is an opiate (narcotic) drug that is prescribed to patients who are suffering from some form of mild to moderate to severe pain. It is available in combination with other ingredients or different combination products and prescribed for various uses. Some hydrocodone products are used just to relieve moderate to severe pain while others are just to relieve cough. Hydrocodone can relieve pain in a patient by changing the way in which the brain and nervous system normally do respond to pain. It brings immense relief and comfort to those who are suffering from pain.