Orally, by mouth. It's hits your quicker by doing it thru your nose, but since xanax is not water soluble you don't get the full effects. Don't even try to inject it because you will have no success.
SUBOXONE is a partial opiate agonist, which means it has a ceiling effect as to how high it can get you, where as methadone is full agonist. Taking xanax with any type of opiate is dangerous...