How low you should go with blood pressure and cholesterol? from the Harvard Heart Letter
High blood pressure (also known as hypertension) slowly damages arteries. It is a key contributor to heart attack and stroke. Low blood pressure is harmful in more immediate ways. It can cause blurry vision, confusion, dizziness, fainting, and falls. Among healthy people, a good blood pressure is under 120/80. For people with hypertension, lowering blood pressure to 120/80 may be a good goal, but is usually more trouble than it's worth. That's why most people with hypertension aim for a target under 140/90.
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