Quote from BlockIVstudent
If beta agonists vasodilate, then why does a beta blocker ultimately lower blood pressure (I realize this is an unlabeled use, as they are more or less for reducing contractility in the heart)?
Am I wrong in thinking that blocking vasodilation would actually elevate blood pressure?
First look up different receptor sites and where they are located (Alpha1, Alpha 2, Beta1, Beta 2). Once you have this information you should be able to figure out how they lower BP.
You are correct in by block vasodilation you would increase BP.
If you still don't understand after doing some research, come back with what you have learned and we can point you in the right direction.