What is a common symptom of amphetamine use?

Heightened alertness is a well-known symptom of amphetamine use. Amphetamines are central nervous system stimulants that increase the release of neurotransmitters like dopamine and norepinephrine, which can lead to enhanced focus, increased energy, and greater responsiveness to stimuli. Users often report feeling more awake and alert, which can be particularly sought after for tasks requiring sustained attention.

In contrast, the other options reflect different effects or symptoms associated with other substances or conditions. Increased appetite is more commonly associated with substances that depress the central nervous system, while hallucinations can occur with severe abuse or in the context of certain mental health disorders. Slowed reaction time can be a result of fatigue or depressant use, rather than the stimulating effects of amphetamines.