Klonopin (clonazepam) is a prescription medication that belongs to a class of drugs called benzodiazepines. It is primarily used to treat: Seizures: Klonopin is used to treat various types of seizures, including absence seizures, partial seizures, and tonic-clonic seizures. Anxiety disorders: Klonopin is used to treat anxiety disorders such as panic disorder, social anxiety disorder, and