The invention describes a method and pharmaceutical compositions for subcutaneous and intracutaneous injection for reduction of localized fat deposits comprising the use of (3-sn-Phosphatidyl)-cholin as a main active and supporting ingredient either on its own, diluted or in combination with compounded agents to initiate the process of lipolysis of the adipose tissue by activating the natural metabolism process in the body. The method can be used on all excess adipose tissue of the body and face, including medical conditions that result from metabolic disorders or those originating from effects from pharmaceutical agents, in addition or apart from lifestyle conditions or other known conditions that generates the growth and expansion of fat cells to accumulate excess body fat. It is the first known effective method of use of such agents in subcutaneous and intracutaneous use that allows a cosmetic reduction of adiposity without surgical intervention. The method of the invention has made it possible to achieve satisfactory cosmetic results in one to four treatment sessions.