Metoprolol is medication for high blood pressure. Bromazepam treats anxiety disorders. An individual can buildup a tolerance, dependence and have withdrawl symptoms from the drug. I haven't seen that drug used to treat heart disorders, in fact it may be contraindicated for heart patients. I don't have a comment on the dosage as that would be a determination made by your father's doctor.
Thanks for your comment, and if you have any further questions or comments you are welcome to respond. Take care,
Ken