Even though Klonopin (clonazepam) and Xanax (alprazolam) are both benzodiazepines used for treating anxiety and panic disorders, they produce similar feelings, although the onset, duration, and intensity are different.
Xanax works more quickly, and the duration is shorter with the effects being felt within an hour or two and lasting 4 to 6 hours.
The Klonopin high begins within 1 to 4 hours and lasts up to 12 hours.
Because of the way each drug works, Xanax can be taken several times during the day, and the feeling may be more intense because it acts more quickly.
Klonopin on the other hand, is only taken once or twice a day, and the feeling is more gradual because it lasts longer.
They both treat panic disorders and anxiety, although Xanax is more common for generalized anxiety disorder and Klonopin is also used for seizure disorders.