Buy Klonopin Online with credit card and get up to 10% cashback on every order. It is the smaller dose of the Klonopin family. Klonopin (clonazepam) is a medication used to treat anxiety disorders, panic disorder, and seizures. The usual starting dose for adults with anxiety disorder is 0.25 mg to 0.5 mg taken two times per day. The dose may be gradually increased as needed and tolerated, with a maximum dose of 4 mg per day.