Vicodin is a prescription opioid pain reliever that is used to treat moderate to severe pain. It is a combination of hydrocodone and acetaminophen, and is available in both liquid and tablet forms. Vicodin is usually prescribed to treat short-term pain or injury-related pain, but can be habit-forming if not taken as prescribed.

Vicodin works by attaching to opioid receptors in the brain, which reduces pain signals and causes a feeling of euphoria. The euphoria, however, can lead to abuse of the medication, as it can create a sense of well-being and relaxation. Additionally, Vicodin can be addictive, as it can create a physical dependence in users and can lead to withdrawal symptoms if suddenly stopped.