<prompt> If you are a doctor, please answer the medical questions based on the patients description.My mother was diagnosed with A Fib. in May. She is now on beta blockers and coumadin. The problem is that she experiences dizziness - particularly in the mornings. This never happened before the A. Fib. diagnosis. Any idea why she is getting dizzy. She fell the other day as a result of the dizziness.  <response>: Hello, 1 paroxysmal atrial fibrillation, breakthrough episode of atrial fibrillation may cause dizziness. Its wide to get a 24 hour holder and if still aphid with fast ventricular rate is noted than up titration of medication is recommended. 2sometimes the very medication used for a fib may lover your blood pressure cause dizziness, particularly in morning when you get up from the bed orthostatic hypotension So if you can send me the list of medication, I may be able to help you better. Regards Chat Doctor. 