Repurposing amlodipine, a commonly used blood pressure medicine, could help manage attention-deficit/ hyperactivity disorder (ADHD) symptoms, according to an international study involving the University of Surrey. In a study published in Neuropsychopharmacology, researchers tested five potential drugs in rats bred to exhibit ADHD-like symptoms. Among them, only amlodipine, a common blood pressure medication, significantly reduced hyperactivity.