Similar term(s): opiates.
Class of drugs (e.g., heroin, codeine, methadone) that are derived from the
opium poppy plant, contain opium, or are produced synthetically and have
opium-like effects. Opioid drugs relieve pain, dull the senses, and induce
Source: San Francisco AIDS Foundation
Effects of prolonged use of Opioids include long-term changes in certain brain
receptors, and changes in learning and in the response to stress.
Opioids make up one of the four groups of psychoactive drugs, next to
depressants, stimulants, and hallucinogens.
Alcohol - Hallucinogen - Nervous system - Opioids - Stimulants
To read about this term in context:
GreenFacts Summary on Psychoactive Drugs Tobacco, Alcohol, and Illicit Substances: