Codeine is a prescription opioid used to relieve mild to moderate pain and suppress cough. It works by altering how the brain and nervous system respond to pain signals. Often combined with acetaminophen or other agents, Codeine provides short-term comfort for acute discomfort. It must be used only under medical supervision due to its potential for dependence and side effects such as drowsiness or nausea. Always follow dosing instructions and avoid alcohol or other sedatives while taking Codeine.