This document discusses how to build powerful pharmaceutical brands. It outlines five key measures of a brand's power: clarity, distinctiveness, leadership, awareness, and familiarity. A powerful brand forms an emotional bond with doctors by coming to mind as a friend that can be relied on to help patients. While rational attributes like efficacy matter, emotional relationships where the brand is close to doctors' hearts drive prescribing. The document also categorizes different types of pharmaceutical brands and explains why some brands fail to meet their potential, such as by not generating enough awareness or having an inconsistent image.