: Hydrocodone is used to reduce chronic pain.However it is a combination formulation to treat cough and antitussive .Hydrocodone relieves the pain by changing the way the brain and nervous system respond to pain.Hydrocodone extended-release (long-acting) capsules or extended-release tablets should not be used to treat pain that can be controlled by medication that is taken as needed. Sometimes it may cause side effect like(dry mouth,tiredness,stomach pain). Before use it ,try to concern your doctor.