title: Why is the global CNS pharmaceutical market so under-penetrated?
authors.forename: William M
authors.initials: WM
authors.lastname: Pardridge
mesh_terms: D001812:Blood-Brain Barrier; D002491:Central Nervous System Agents / Q000627:therapeutic use; D002493:Central Nervous System Diseases / Q000188:drug therapy; D003363:Cost Control; D004345:Drug Industry / Q000191:economics / Q000639:trends*; D019981:Health Care Sector / Q000706:statistics & numerical data*
chemical_list: D002491:Central Nervous System Agents