What are the effects of amphetamine-like substances?

Amphetamine-like substances are primarily known for their stimulant effects on the central nervous system. These substances increase the level of certain neurotransmitters in the brain, such as dopamine and norepinephrine, which can lead to increased alertness, improved focus, heightened energy levels, and elevated mood.

The stimulant properties make them useful in certain medical contexts, such as the treatment of attention deficit hyperactivity disorder (ADHD) and narcolepsy. However, they can also lead to side effects, including increased heart rate, heightened anxiety, and potential for dependency when misused.

Understanding the stimulant nature of these substances is crucial, especially in distinguishing them from sedatives or tranquilizers, which have an entirely different effect on the body, such as promoting relaxation or sedation. It is these stimulant effects that characterize amphetamines and similar compounds, confirming the correctness of the selected answer.