Codeine is a naturally occurring opioid derived from the opium poppy, used to treat mild to moderate pain and suppress coughs. It works by binding to opioid receptors in the brain, reducing pain perception and cough reflex. A small portion converts to morphine in the body for its effects. Common forms include: Cough syrup with codeine (often combined with promethazine in promethazine codeine, a purple syrup for allergies/colds, known as "lean") Tylenol with codeine or Tylenol 3 with codeine (acetaminophen + codeine tablets for pain) Note: Yes, codeine is an opioid with risks of addiction, respiratory depression, and overdose. Hydrocodone does not contain codeine; it's a separate, stronger semisynthetic opioid. Use only as prescribed; consult a doctor