Which of the following are the chemical substances that decrease anxiety?
A tranquilizer is a drug, that acts on the central nervous system and is used to calm a person and decrease anxiety, or help a person to sleep. Often called depressants because they suppress the central nervous system and slow the body down, they are used to treat mental illness as well as common anxiety and sleeplessness. Available only by prescription, they can cause dependence and certain ones can easily be abused.