Klonopin (clonazepam) is used to treat seizures, panic attacks, and anxiety. There are many clonazepam pills available on the market. Each has a different color, shape, and font. Colors indicate Klonopin dosage. An important indicator is a label that identifies the manufacturer and the dosage. Users may find tablets labeled Teva 833 or V 2531 or something else, and it is important to know what these letters and numbers mean.