What is a characteristic sign of depressant intoxication?

Drowsiness is indeed a characteristic sign of depressant intoxication. Depressants, such as alcohol, benzodiazepines, and barbiturates, work by slowing down the central nervous system. This effect often manifests as significant sedation, leading to drowsiness and a decreased level of alertness. Individuals under the influence of these substances may appear lethargic and have difficulty concentrating, which is consistent with the sedative effects produced by depressants.

In contrast, impulsive behavior is more commonly associated with stimulants or other substances that heighten arousal and reduce inhibitions. Hallucinations can occur with hallucinogens or severe intoxication with certain substances, but they are not typical for general depressants. Increased hunger might be seen in some context but is not a defining feature of depressant intoxication, as it is more often related to stimulants or specific mood-related changes rather than the calming effects of depressants. Thus, the primary and most recognizable symptom in the context of depressant intoxication is indeed drowsiness.