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Tranexamic acid (TA) administration in aneurysmal subarachnoid hemorrhage (SAH) within the first 24 hours may reduce the incidence of early aneurysmal rebleeding. However, this is also the potential for an increased risk of delayed cerebral ischemia if TA is administered for more than 72 hours following the initial aneurysmal rupture. In the ultra-early tranexamic acid after subarachnoid hemorrhage randomized controlled trial by Post ., patients were randomized to receive TA within the first 24 hours, or until start of aneurysm treatment.