For the millions living with high blood pressure, the choice of medication has long been guided by cardiovascular numbers alone — but a sweeping Australian study of 66,000 adults suggests the brain may have a stake in that decision too. Over nearly twelve years, those prescribed antihypertensives capable of crossing the blood-brain barrier developed dementia at a measurably lower rate than those on drugs that cannot reach brain tissue. The finding does not yet rewrite prescribing guidelines, but it quietly enlarges the question medicine has been asking: when we treat the heart, what else might