Dead at 21 (1994)

Ed would like to be a normal teenager. Unfortunately, Ed has been used for intelligence enhancing research, and is extremely smart as a consequence. Equally unfortunately, the chemicals used in the research are affecting his brain in such a way that he'll be dead on his 21st birthday unless he finds a cure. With this in mind, he escapes from the research facility. The research facility is none too happy about this, and tries to recapture him.