Yesterday morning a tall, lanky 16-year-old boy in a red polo shirt stood at a podium in front of a roomful of doctors, scientists, and regulators and told them about how a drug they were considering for approval had changed his life. “I had seizures for 10 years,” he said. “My parents tell me there were times I had seizures 100 times a day.” Now, he said, he has been seizure free for nearly two and a half years. “I can understand what goes on at school,” he said.