The Dark Fields (Limitless #1)

Imagine a drug that makes your brain function with perfect efficiency, tapping into your most fundamental resources of intelligence and drive, releasing all the passive knowledge you'd ever accumulated. A drug that made you focused, charming, fast, even attractive. Eddie Spinola is on such a drug. It's called MDT-48, and it's Viagra for the brain-a designer drug that's redesigning his life. But while MDT is helping Eddie achieve the kind of success he's only dreamed about, it's also chipping away at his sanity-splitting headaches, spontaneous blackouts, violent outbursts. And now that he's hooked and his supply is running low, Eddie must venture into the drug's dark past to feed his habit. What he discovers proves that MDT, once a dream come true, has become his worst nightmare.