Klonopin is used to treat panic disorder, anxiety disorders, seizure disorders, sleep problems, muscle spasms, alcohol withdrawal, illness anxiety disorder, and depressive disorders. Such uses must be under the guidance of a healthcare provider. Those who struggle with panic disorders are relieved of calming effects, which reduce excessive nervous activity and relieve restlessness and fear. Klonopin is a long-lasting benzodiazepine, which means it stays in your body longer than most other benzodiazepine medications. In general, it stays in your bloodstream for anywhere from 5-14 days.