Which statement is true about psychoactive drugs?

Psychoactive drugs are substances that can change a person's mental state by affecting the way the brain functions. These alterations include changes in perceptions, moods, consciousness, and feelings. This capacity to modify how individuals experience reality is what categorizes them as psychoactive.

The statement regarding the ability of psychoactive drugs to alter perceptions and feelings captures the essence of how these substances interact with the brain's neurochemistry. For instance, drugs such as LSD or psilocybin can lead to visual and auditory changes, while substances like antidepressants can significantly impact emotional well-being.

In contrast, the other statements do not hold true in the context of psychoactive drugs. Not all psychoactive drugs have stimulative effects; they can be depressants, hallucinogens, or stimulants, which means they can vary widely in their effects. Furthermore, like any other substances, psychoactive drugs can indeed have side effects, ranging anywhere from mild to severe. They also exist in various forms, including over-the-counter medications and recreational substances, so they are not limited strictly to prescriptions.