I'm currently taking Xanax (alprazolam) for PTS and anxiety. My doc prescribed a beta blocker for rapid HR due to mitral valve profusion. Contraindications?

You can. Take the two together without any concerning issues. You might feel fatigued with the mixture of the two. But you may also get better anxiety control as betablockers can help with anxiety too.

Related Questions

Is it okay to take medications like Xanax (alprazolam) or Zoloft if you had heart surgery. Mitral valve repair? Will these effect in any way?

Should be safe. With the okay of your cardiologist or your cardiothoracic surgeon and being followed by a psychiatrist, these medications should be safe. Read more...
Should be OK. It is not unusual to take these medications after heart surgery. It is important, however, to make sure your doctors know what medicines you are taking. Read more...