Yes, it is legal to buy Klonopin Online, ​Klonopin is a brand name for the medication clonazepam, commonly prescribed to treat anxiety, panic disorders, and seizures. In 1975, the US Food and Drug Administration (FDA) approved klonopin as an antiseizure medication. It hales to a class of benzodiazepines and is also available under the generic version of Clonazepam.