鎮靜劑

Also known as nerve depressant, central depressant, Depressants, central nervous system depressant, CNS depressant, central nervous system depressants

Depressants, also known as central nervous system depressants, or colloquially known as "downers", are a class of psychoactive drugs characterised by decreasing neurotransmission levels, decreasing the electrical activity of brain cells, or reducing arousal or stimulation in various areas of the brain. Commonly used depressants include alcohol, opioids, and benzodiazepines. Some specific depressants influence mood, either positively (e.g., opioids) or negatively (e.g., alcohol), but depressants often have no clear impact on mood (e.g., most anticonvulsants). In contrast, stimulants, or "uppers