Klonopin (Clonazepam) is a medication used to prevent and treat seizures, panic disorder, and for the movement disorder known as akathisia. It is a type of benzodiazepine. It’s a K-shaped perforation containing 0.5 mg of Klonopin (clonazepam) and unscored tablets with a K-shaped perforation containing 1 mg or 2 mg of Klonopin (clonazepam). It begins having an effect within an hour and lasts between six and twelve hours.