[Neither a hero nor a villain: elements of medical practice in primary care].

This article describes the elements present in medical practice that contribute to understand its acknowledged low adhesion to the guidelines set forth by the Brazilian Primary Health Care (PHC) Policy. The empirical material produced by the two investigations of a qualitative nature led by the research team were put into use. In the first, in interviews involving managers and social control in cities the State of São Paulo, Brazil, physicians (acknowledged as central professionals for the construction of the Brazilian Unified Health System - SUS), are referred to as important assets to explain the difficulties to form a qualified primary health care service: the so-called "villain physicians.