My bp is usually in the 115-125/65-75 range. i was wondering how low can my bp go before causing an issue?

Blood pressure: Your listed numbers are normal. Blood pressure can be asymptomatic down to 80 systolic sometimes more as the pressure drops however perfusion pressure to the organs especially heart and brain can drop to inadequate levels and then symptoms and physiologic loss are produced, usually this is under 80 systolic but a single number is hard to give. Certainly a systolic of 60mmhg is virtually always bad.