Interactions Reminyl, Ebixa, Beta Blockers

Updated
Tim M Says:

Are people familiar with side effects when adding a beta blocker when patient is already on reminyl/ebixa combination. Mom (83) has taken a significant comprehension downturn, persistent diarrhea, and very sleepy.
I see that the reminyl/aricept decrease heart rate, patient has tachycardia, being treated with metoprolol.