Vicodin is a prescription medication that combines two active ingredients: hydrocodone and acetaminophen. It is primarily used to relieve moderate to severe pain, often after surgery or injury. Hydrocodone is an opioid that works by altering the way the brain and nervous system respond to pain, while acetaminophen helps reduce fever and alleviate pain. Due to its opioid component, Vicodin has the potential for misuse and addiction. It is important for patients to use it only as directed by a healthcare provider. Common side effects may include dizziness, drowsiness, and constipation, and it should be taken with caution, especially in individuals with a history of substance use disorders.