Hydrocodone can be addictive because it changes how the brain works.Besides stopping pain, it can make some people feel very relaxed, happy, or “high.”These good feelings can make the brain want more, even when the pain is gone. If someone takes hydrocodone often, the body can get used to it, and they may feel bad or sick without it. This is called dependence and can lead to addiction. That’s why doctors give hydrocodone only when needed and for a short time.