When the audience has to invent excuses why the script doesn't suck, that's when you know it really does.
I'm not inventing anything. His wife says herself that getting off of the drug has pretty much the opposite extreme on your brain, you become something akin to a Heroin junkie with ADD.
There may have been holes in the script, yes, but the fact that Eddie didn't use the drug, or his knowledge, to help his ex, the other people out there on the drug, or even to go into the pharmaceutical business is not a flaw in the movie.
You tend to do this a lot Temis where you down-rate a movie simply because it didn't do what you would have done. Like with "Inception" you down-graded an excellent film because you didn't think the dreams were surreal or bizarre enough. That they should have dreamed dinosaurs or something in the final mission; ignoring the entire
point of what they were doing was to not tip-off the subject that he was in a dream.
Simply put: The reason why Eddie didn't use the drug to help his wife or others is because that wasn't the story. It was a story of HIS life and what he did while under the drug and with the "power" it gave him. I find that character vastly more interesting that watching one about a man who finds a nifty drug and then decides to become his own drug company with the altruistic purposes of helping people around the world become crazy smart.
I will say my one heavy complaint about the movie is that it jumps from the action to a "and then everyone lived happily forever, okay bye" ending. Eddie drinks the blood of the loan shark, gets the drug's powers, and thinks his way out of that situation. Then he tracks down the hit-man guy who apparently is cool now with helping Eddie and not killing him, helps him get more drugs, flash forward a year where all of Eddie's problems are solved, he's engaged and he's off the drug.
Seems there's probably 15-20 minutes of movie there.
I also wonder how he'd succeed in an election with him being a subject of a murder investigation, let go only due to lack of evidence to hold him not through an acquittal.
But, none the less, I liked the movie see Eddie as an "everyman" character who is neither bad nor good and don't have a problem with what Eddie did while on the drug -solved his own problems and improved his own life rather than the lives of others.