As needed medication for Panic Attacks, besides Benzo's and Vistaril?

Hi, I have a patient who is only interested in a Benzo, however, due to his extensive history of substance use, I am trying to avoid anything addicting. He's already on an SSRI but I want something that will be helpful for when he is having the panic attacks. Vistaril was of no benefit in him. I mentioned taking Buspar regularly but he does not want to take anything on a regular basis. I even talked about low dose Propanolol (has asthma). I was wondering if there is anything else you guys... As needed medication for Panic Attacks, besides Benzo's and Vistaril?
Source: Student Doctor Network - Category: Universities & Medical Training Authors: Source Type: forums