m not sure how the Toprol will react with the
Diovan, but you may see some overlap and your
blood pressure med may need adjusted. Did the doctor discuss the effect of taking both drugs?
I looked in a drug reference manual, and it doesn't say you can't take them both, but I understand your concern.
As Stella said, your blood pressure problem may resolve itself once you start taking a thyroid med like Methimazole.