When a doctor suggests medication, why is it still such a long process of trial and error?

A medication that helps one child with autism can actually worsen symptoms for another, and scientists are finally uncovering the genetic reasons why. * The $3 billion leadership search at the National Institute of Neurological Disorders and Stroke. * A 37% drop in new research funding and its impact on medical innovation. * Screening 500 existing FDA-approved drugs using transparent zebrafish. * Shifting from "trial-and-error" prescriptions to genetic precision medicine. We explore how these tiny fish are helping scientists map a future where treatments are tailored to a child's specific DNA rather than a broad diagnosis.