Different studies in the field of addictions have highlighted the importance of providing a good quality health care. Perceived quality as well as being an indicator of the degree of excellence achieved by an organization, is also an excellent predictor of the individual's attitude towards treatment and adherence. 931 users of public Galician health care services were interviewed in order to develop an empirical validation and a reliability study on a perceived quality scale. The SEM analysis carried out made possible to offer a simple and brief scale (only 14 items) with excellent psychometric properties (α=0,84; criterion validity=64%), to be used to assess the quality of health care in the field of drug addiction.