On coumadin (warfarin) for paroximal afib/tia in the past. considering switching to palvix w/aspirin is this advisible? is there a greater risk of bleeding?

It depends on : Your stoke risk....Bleeding risk are fairly equivalent ...But given history of TIA this gives you a chads2 score at least 2 so anticoagulantsation would be the recommendation.

Don't switch : If you have had atrial fibrillation and a tia, then you are at risk of stroke. Barring a strong contraindication, you really need to be on an oral anticoagulant--either warfarin or Eliquis or xarelto or pradaxa. Plavix/aspirin do decrease your risk of stroke a little but not nearly as much as an anticoagulant. Talk to your doctor about which anticoagulant is best.