psychoactive substances

**Psychoactive Substances**

Psychoactive substances are chemical compounds that, when ingested, inhaled, or otherwise introduced into the body, affect the brain’s function, resulting in alterations in perception, mood, consciousness, cognition, or behavior. These substances include a wide range of drugs, from legal medications and stimulants to recreational and illicit drugs. Common examples include caffeine, alcohol, nicotine, cannabis, and various prescription medications, as well as substances like LSD, MDMA, and opioids. Understanding psychoactive substances is crucial for discussions related to neuroscience, psychology, pharmacology, addiction, mental health, and legal regulations.