Klonopin is a brand name version of the drug Clonazepam. This medicine is most commonly prescribed to treat seizures, but it’s also shown effectiveness in treating panic attacks. It’s well-liked among doctors and patients because it works quickly. However, it should be noted that this medicine is not designed for long-term use. Klonopin works by changing chemicals in your brain. The result is a feeling of relaxation, both in your mental state and in your body as your muscles loosen.