Substances that come from the opium poppy, as well as any substance that dulls the senses, relieves pain, and causes deep sleep. Some, such as morphine and codeine, are helpful in dulling the pain of cancer and other ailments. Others, such as heroin, can be deadly, and all are potentially addictive.

opioid analgesics – natural or synthetic substances, which very much resemble morphine, comparing of course only their effect.

Any ingredients of the opium or chemical derivatives of these ingredients. Opiates generally refer to opium, morphine, codeine, thebaine, and heroin” ( Levinthal, 95).

A drug derived from a sap taken from a seedpod of the plant papaver somniferum . General effects of narcotic analgesics (narcotics cause drowsiness – narcosis – and relieve the sensation of pain – analgesia) include: sedation, slowed reflexes, raspy speech, sluggish movements, slowed breathing, cold skin, and possible vomiting.

Drugs derived from opium, such as heroin and morphine.

A family of depressant drugs including heroin, methadone, codeine, morphine and opium.

Narcotic drugs such as morphine and fentanyl often are used to reduce the pain from surgery. While very effective at controlling pain, these drugs may have side effects such as drowsiness, itching, constipation and nausea.

Substance derived from the opium poppy. The term opiate excludes synthetic opioids such as heroin and methadone.

A soporific or narcotic drug that is made from opium or its derivatives or by synthetic means. Sometimes called opioids.

Narcotic drugs derived from the opium poppy.

depressant drugs, derived from opium, used to relieve pain or to induce a euphoric state of consciousness. (221)

Drugs derived from opium such as morphine and codeine, together with the semi-synthetic congeners such as heroin.

Hutchinson encyclopedia Naturally produced chemical in the body that has effects similar to morphine.

A family of drugs that are derived, either naturally or synthetically, from the seeds of the oriental poppy. Opium was has been used for its euphoric and medicinal effects since 3400 b.c., leading to the development of heroin in 1874.

Opium or one of its chemical derivatives: codeine, morphine, or heroin. Central nervous system depressants that relieve pain and produce euphoria, all highly addictive (syn. narcotics). See also heroin.

Any of the psychoactive drugs that originate from the opium poppy or that have a chemical structure like the drugs derived from opium. Such drugs include opium, codeine, and morphine (derived from the plant), and hydromorphone (Dilaudid), methadone, and meperidine (Demerol), which were first synthesized by chemists.

Any of the psychoactive drugs that originate from the opium poppy or that have a chemical structure like the drugs derived from opium. Some opiates (such as opium, codeine, and morphine) are derived from the plant, while others were first synthesized by chemists.