Definitions (2)
Related Terms
1. Natural or synthetic substance which (when taken into a living body) affects its functioning or structure, and is used in the diagnosis, mitigation, treatment, or prevention of a disease or relief of discomfort. Also called legal drug or medicine. A legal or medicinal drug (such as amphetamines), however, can be harmful and addictive if misused.
2. Habit forming stimulant or narcotic substance (such as alcohol, cannabis, nicotine, or a derivative of cocoa or poppy) which produces a state of arousal, contentment, or euphoria. Continued or excessive use (called drug abuse or substance abuse) of such substances causes addiction or dependence.
Thereafter any attempt to discontinue their use results in specific reactions (called withdrawal symptoms) such as sweating, vomiting, and tremors which cease when the use is resumed. Also called illegal drug where its production and/or use is prohibited.

Whether a substance is legal or illegal, however, may have nothing to do with its potential for addiction or harm: alcohol and nicotine, both addictive and harmful, are legal in most countries because they generate substantial employment or government revenue through taxes.

Use 'drug' in a Sentence

The researchers recently found out that the feeling of love is actually a chemical reaction in the brain similar to the effects of a narcotic drug.
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The newest drug antibiotic to hit the market is considered to be the next in line for worldwide distribution and could possibly reshape how doctors across the world treat various infections.
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The drug surprised it's creators because instead of curing breast cancer as it was designed, it instead turned cancer back into healthy cells.
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