Research in The Lancet said such a change could save millions of lives around the world.
Current guidelines issued by NICE (National Institute for Health and Care Excellence) say patients should only receive medication if their levels reach 140/90 mmHg.
But experts say the study - which involved 600,000 people around the world - found using drugs "significantly reduced the risk of major cardiovascular events, stroke, heart failure, and death".
Overall, every 10 mmHg reduction in systolic blood pressure reduced the risks of major cardiovascular disease events and heart disease by about one fifth, and stroke and heart failure by about a quarter, and the risk of death from any cause by 13%.
Professor Kazem Rahimi, of the George Institute for Global Health, said: "Our findings clearly show that treating blood pressure to a lower level than currently recommended could greatly reduce the incidence of cardiovascular disease and potentially save millions of lives if the treatment was widely implemented.
"The results provide strong support for reducing systolic blood pressure to less than 130 mmHg, and blood pressure-lowering drugs should be offered to all patients at high risk of having a heart attack or stroke, whatever their reason for being at risk."
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