codeine - derivative of opium; used as an antitussive (to relieve coughing) and an analgesic (to relive pain)

Fentanyl, Sublimaze - trade names of a narcotic analgesic that can be inhaled and that acts on the central nervous system and may become addictive; used as a veterinary anesthetic and with other drugs before, during, and after surgery; also used as a nonlethal gas to incapacitate people in hostage situations; also abused as a recreational drug

diacetylmorphine, heroin - a narcotic that is considered a hard drug; a highly addictive morphine derivative; intravenous injection provides the fastest and most intense rush

laudanum, tincture of opium - narcotic consisting of a tincture of opium or any preparation in which opium is the main ingredient

morphia, morphine - an alkaloid narcotic drug extracted from opium; a powerful, habit-forming narcotic used to relieve pain

narcotic - a drug that produces numbness or stupor; often taken for pleasure or to reduce pain; extensive use can lead to addiction

opium - an addictive narcotic extracted from seed capsules of the opium poppy