Nowadays, it is very important that companies understand customer needs personally. This is why Six Sigma strategy is a fundamental matter in understanding customer and market needs, using certain data to drive both strategy and action to improve the basic processes. In many organizations, Six Sigma is a measure of quality that tends to perfection, being a management methodology for process variations. The goal is to keep systematic variation of process under control to eliminate defects that it produces. Article investigates the influence that Six Sigma implementing has on the activities of pharmaceutical companies and based on the results there are underlined the benefits that both companies and customers may attain.