Ten years ago, stimulants like Ritalin and Adderall were the drugs of choice to treat behavioral issues in children. Today children as young as four years old are being prescribed more powerful anti-psychotic medications that are much less understood. The drugs can cause serious side effects and virtually nothing is known about their long-term impact. As the debate over medicating children continues to grow, FRONTLINE confronts psychiatrists, researchers, and big pharma about the risks and benefits of prescription drugs for troubled children.