Background: Since 2000, Iran has been delivering training and treatment services, including methadone therapy, to HIV positive patients through triangular clinics. This study aims to evaluate the effectiveness of these activities at the HIV Triangulation Centre in the city of Kerman, Iran, through clients’ views. Methods: Participants were recruited using a convenience sample and assessed through in-depth interviews, and observations. Data were analyzed using a thematic analysis, matrix based method. Findings: The results found problems in training and counseling which was described by the staff to be due to the effects of the economic difficulties of the clients, not being of the same sex as the consultant, and lack of utilization of a variety of training methods by the clients. Furthermore, the absorption of clients was perceived as being affected by the appearance of the center, gossip around the center, limited working hours, and interpersonal relations between clients and staff. The clients also criticized the building of the center as it failed to maintain anonymity of the patients. The need for supplementary services, such as dentistry, was perceived by many clients. Conclusion: The application of appropriate strategies such as providing adequate training and removing the obstacles of absorption should be taken into account to increase the utility and coverage of the triangular clinic. These interventions could be a range of activities, such as relocating the center to a more decent place and encouraging the staff to appear in a professional white coat to help gain the trust of clients.