Klonopin is a medication that is commonly used to prevent and control seizures. It is classified as a benzodiazepine, which is a type of drug that acts as a central nervous system depressant. Benzodiazepines are some of the most commonly prescribed drugs in the United States, and they are also some of the most commonly abused drugs. While they can be effective when used as directed, they can also be extremely dangerous.​