Which type of drugs are classified as depressants or sedative-hypnotics?

The correct choice identifies central nervous system depressants as the category of drugs classified as depressants or sedative-hypnotics. These drugs function by slowing down brain activity, which in turn can lead to a calming effect on the mind and body. They are commonly used in medical settings to treat conditions such as anxiety, insomnia, and certain types of seizures. Their action promotes relaxation and can induce sleep, which is characteristic of sedative-hypnotics.

Drugs in this category include substances like benzodiazepines and barbiturates. Understanding the nature and effects of central nervous system depressants is essential for professionals in the field, as these drugs require careful monitoring due to the potential for dependence and overdose.