Which of the following is a common indicator of stimulant use?

Restlessness is a well-documented sign of stimulant use. Stimulants, such as amphetamines and cocaine, increase the levels of certain neurotransmitters in the brain, leading to heightened arousal and energy. As a result, individuals who have used stimulants often exhibit behaviors such as fidgeting, an inability to sit still, and general restlessness. This increased activity contrasts sharply with the effects of depressants, which tend to promote relaxation and calmness.

While improved focus may sometimes be perceived as a benefit of stimulant use, it is not as universally recognized as a common indicator of use compared to restlessness. Similarly, while calmness may be associated with the effects of certain drugs, it is not a characteristic of stimulants. Lastly, decreased heart rate does not occur with stimulant use; in fact, stimulants often lead to an increased heart rate. Thus, restlessness stands out as a clear and recognizable indicator of stimulant use.