What are psychoactive drugs known for?

Psychoactive drugs are known primarily for their ability to alter the user's thoughts, emotions, or behavior. This characteristic defines them as substances that, when taken, can significantly impact neurological processes and lead to changes in mood, perception, and cognitive functions. These drugs interact with the brain's neurotransmitters, which can result in various psychological effects, ranging from euphoria to anxiety, and can even influence decision-making and social interactions.

The other options do not accurately reflect the primary nature of psychoactive drugs. While some substances might purport to enhance physical health, that is not the general characteristic of psychoactive drugs, which are more focused on altering psychological states. Similarly, while certain drugs may provide increased energy, the notion of doing so without side effects is misleading; most psychoactive substances come with a range of potential adverse effects. Lastly, the assertion that these drugs only affect physical sensations is an oversimplification, as their primary influence is on cognitive and emotional domains, rather than solely on physical experiences.