Can Eisai’s new Alzheimer’s drug fill blockbuster shoes?

Eisai and Pfizer rolled out a new set of clinical trial numbers on their long-acting version of Aricept (donepezil), with the experimental 23 milligram extended-release formulation besting the 10 milligram immediate-release drug that the Japanese company relies on for the lion's share of its U.S. revenue. In a study which enrolled 1,476 patients, researchers said that the once-daily 23 milligram therapy proved more effective in maintaining and improving brain function than the...