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Intoxication

The WHO Lexicon of alcohol and drug terms defines intoxication as a condition that follows the administration of a psychoactive substance and results in disturbances in the level of consciousness, cognition, perception, judgement, affect, or behaviour, or other psychophysiological functions and responses. The disturbances are related to the acute pharmacological effects of, and learned responses to, the substance and resolve with time, with complete recovery, except where tissue damage or other complications have arisen. The term is most commonly used with regard to alcohol use: its equivalent in everyday speech is "drunkenness". Alcohol intoxication is manifested by such signs as facial flushing, slurred speech, unsteady gait, euphoria, increased activity, volubility, disorderly conduct, slowed reactions, impaired judgement and motor incoordination, insensibility, or stupefaction. Intoxication is highly dependent on the type and dose of drug and is influenced by an individual's level of tolerance and other factors. Frequently, a drug is taken in order to achieve a desired degree of intoxication. The behavioural expression of a given level of intoxication is strongly influenced by cultural and personal expectations about the effects of the drug.

The WHO ICD-11 has several entries for substance related intoxication:

6C40.3 Alcohol intoxication

Alcohol intoxication is a clinically significant transient condition that develops during or shortly after the consumption of alcohol that is characterised by disturbances in consciousness, cognition, perception, affect, behaviour, or coordination. These disturbances are caused by the known pharmacological effects of alcohol and their intensity is closely related to the amount of alcohol consumed. They are time-limited and abate as alcohol is cleared from the body. Presenting features may include impaired attention, inappropriate or aggressive behaviour, lability of mood and emotions, impaired judgment, poor coordination, unsteady gait, fine nystagmus and slurred speech. At more severe levels of intoxication, stupor or coma may occur. Alcohol intoxication may facilitate suicidal ideation or behaviour. 

See also,

6C43.3 Opioid intoxication

6C45.3 Cocaine intoxication

6C46.3 Stimulant intoxication

6C49.3 Hallucinogen intoxication

6C4F.3 Intoxication due to multiple specified psychoactive substances

WHO ICD-11