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

natural bases containing nitrogen found in plants

any chemical that resembles morphine or other opiates in its pharmacological effects.

an addictive narcotic extracted from seed capsules of the opium poppy

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

narcotic consisting of an alcohol solution of opium or any preparation in which opium is the main ingredient

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

an alkaloid medicine (trade name Kavrin) obtained from opium; used to relax smooth muscles; it is nonaddictive

a poisonous white crystalline alkaloid, found in opium but without opioid actions.

an addictive narcotic extracted from seed capsules of the opium poppy