Which of the following is a general indicator of CNS stimulant influence?

CNS stimulants, such as amphetamines and cocaine, typically enhance certain brain functions and produce various physiological and psychological effects. One of the hallmark indicators of CNS stimulant influence is the presence of euphoria and anxiety. These substances stimulate the release of neurotransmitters like dopamine, which can lead to feelings of intense pleasure (euphoria), alongside symptoms of increased alertness and energy. However, they can also induce anxiety and agitation as a side effect, particularly at higher doses.

In contrast, slow reaction time, sleepiness, and loss of consciousness are generally associated with CNS depressants, which slow down brain activity, leading to diminished cognitive function and physical responsiveness. Therefore, identifying euphoria and anxiety as a general indicator of CNS stimulant influence aligns with the expected effects of this class of drugs, showcasing their stimulating properties.