Barbiturates are primarily used for what medical purposes?

Barbiturates are primarily known for their use in treating anxiety and as a method for managing insomnia. These medications work by depressing the central nervous system, which helps promote relaxation and sleep. They have sedative effects, making them effective for individuals who struggle with anxiety or require assistance to fall asleep. While they can provide significant relief in these areas, their usage has declined due to potential for dependence and the availability of safer alternatives. This is why the correct answer focuses on anxiety relief and insomnia treatment, highlighting the specific therapeutic applications of barbiturates over other uses.