Dead at 21 (1994)

Ed would like to be a normal teenager. Unfortunately, he has been used for intelligence-enhancing research, and consequently he is extremely smart. 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, which is not happy and tries to recapture him.