CNS depressants are a class of medications that slow down brain activity, leading to a calming effect on the central nervous system. They are commonly prescribed to treat conditions such as anxiety, insomnia, and seizures. Examples of CNS depressants include benzodiazepines, barbiturates, and alcohol. These substances work by enhancing the effects of a neurotransmitter called GABA, which inhibits brain activity. While they can be effective for short-term use, prolonged use can lead to dependence, tolerance, and withdrawal symptoms. It is important to use CNS depressants under medical supervision to minimize risks.