Buy Klonopin Online (Clonazepam) is used to prevent fits (seizures) and panic attacks. It is an antiepileptic drug that belongs to the class of medications referred to as benzodiazepines. Klonopin is a medicine used to help control seizures and anxiety. Klonopin works by modulating the effects of chemicals in the brain that cause seizures. It comes in pill form and may be taken with or without food.