The adherence to treatment regimens to Highly Active Antiretroviral Therapies (HAART) is the problem for the success of the viral infection. In this longitudinal study was to explore the relationship of IDUs between
adherence to HAART by self-efficacy, effort and control expectancy a sample of 100 HIV+ patients on a methadone maintenance program in Madrid (Spain). They were elicited using a structured, interviewer-administered questionnaire and they were followed for one year. We have split up the sample with the rigourous adhesion criteria (>85% pill intake) and we were been a analysed the relation the adherence to HAART over time with these variables. We describe the following 4 research team: the patients was continued, was refused, was started and the patients was the treatment failure. The results considering that detected significant relations
between these variables and the adherence to HAART in the start, continuation, refuse and to medical treatment failure.