Hydrocodone is a prescription opioid medication used to relieve moderate to severe pain and, in some formulations, to suppress cough. It works by binding to opioid receptors in the brain and nervous system, reducing the perception of pain and producing a calming effect. Hydrocodone is often combined with other medications such as acetaminophen or ibuprofen to enhance pain relief. Because it is an opioid, hydrocodone can cause side effects like drowsiness, dizziness, nausea, constipation, and slowed breathing. It also carries a risk of dependence, misuse, and addiction, especially with long-term use or higher doses. For these reasons, it is classified as a controlled substance and should be used only as prescribed by a healthcare provider.