Normal BP is 120/80. Good target BP 125/85.
Beta blockers are now not routine 1st choice in current guidelines and though they are potent BP drugs do not seem to improve mortality ( death rate) or morbidity ( risk of heart attack
) nearly as much as many other BP drugs. You don't mention the drug name, but the dose suggests propanolol or one of the older beta blockers. If I am right this is even more unusual because that type of beta blocker is quite old and no longer routinely given to new patients. I might be tempted to be cheeky and ask how old you doctor is.