Verubecestat
Verubecestat is under investigation for the treatment of Alzheimer's Disease, Prodromal Alzheimer's disease, and Amnestic Mild Cognitive Impairment.   Verubecestat is Merck’s investigational oral β-site amyloid precursor protein cleaving enzyme (BACE1 or β secretase) inhibitor. In July 2013, Merck announced positive results for Phase Ib trials of Verubecestat. In the study, administration of Verubecestat at doses of 12, 40 and 60 mg resulted in a dose-dependent and sustained reduction in the levels of Ab40, a measure of BACE1 activity, in CSF from baseline of 57, 79 and 84 percent, respectively.