Codeine is opium that is used during the treatment of restlessness, cough, and diarrhea. And it is similar to morphine and hydrocarbons as an alcoholic anxiety-reliever and phlegm suppressant. Additionally, codeine converts a small amount of codeine into morphine throughout the body. The exact active ingredient is not recognized; However, codeine, like morphine, connects to nerves in the brain that are necessary to express the feeling of pain in the body and brain. Codeine improves tolerance for pain, reducing distress but the pain is still visible to the patient. This medicine not only reduces pain but also fainting and disturbed breathing. For a more effective and safer reliever, codeine is often combined with acetaminophen (Tylenol) or aspirin.