Vicodin is the fictionalized pain medication to which Dr. House is addicted in House, M.D.
House takes Vicodin to manage chronic pain caused by a damaged leg muscle. The medication contains hydrocodone and acetaminophen, and the series repeatedly shows how his dependence affects his judgment, relationships, and employment.
House's addiction is not merely a background detail. It becomes a continuing story about pain management, denial, medical professionalism, and the consequences of self-treatment. Other characters, especially Lisa Cuddy and James Wilson, try at different times to confront him about his use of the drug.
Vicodin is a brand name associated with hydrocodone and acetaminophen in the United States. Viewers sometimes remember the medicine simply as a symbol of House's pain, but the show specifically names Vicodin. The substance and its effects are part of the character's established biography rather than a one-time plot device.