I have panic attacks. i have .5mg xanax (alprazolam) pills (which really help), but is there a way i can burn off the horrible residual adrenaline? a brisk walk?

Yes: Walk will help. Try yoga, drink plenty of water, listen relaxing music.

Exercise & Relax: When you get the "fight or flight" response to stressful events it is helpful to exercise or to do the "relaxation response." both of these will assist in significantly decreasing that stressed feeling that stems from adrenaline, cortisol, and increased blood pressure and heart rate. For more information on the relaxation response, see: http://www.Massgeneral.Org/bhi/basics/rr.Aspx.

Caution : Heavy exercise induces lactic acid. In some but not all patients, Lactic Acid induces panic... That is why panics and asthmatics both should exercise slowly and not heavily. Zoloft, effexor, (venlafaxine) Paxil , Imipramine and Klonopin are all effective in treating panic disorder. Have you asked your md for those?