Codeine is a prescription medication that belongs to a class of drugs known as opioids. It is commonly used to relieve mild to moderate pain and to reduce coughing. Codeine works by binding to specific receptors in the brain, which helps to decrease the perception of pain and suppress the cough reflex. This medication is often found in combination with other ingredients, such as acetaminophen or aspirin, to enhance its effectiveness. While codeine can be beneficial for pain relief, it also carries a risk of side effects, including drowsiness, constipation, and the potential for dependence or addiction if misused.