Klonopin is a brand-name also available under the generic name Clonazepam. It is an oral prescription belonging to the benzodiazepine group of drugs that help to treat certain seizure disorders in adults and children; for the absence of seizures (Lennox-Gastaut syndrome. It is also used to treat anxiety disorder and panic disorder in children. Buy Klonopin Online. It is useful in treating, controlling, and managing seizures, anxiety, and panic disorders. This medication takes effect within 1 hour and lasts for 6 hours.