Conflict of interest is a real situation in which a person as a decision maker simultaneously has two positions, one in private and the other in the public. In public role he or she has to pay attention to the society`s best interests and follows his or her best ones as private role. Conflict of interest is a common challenge of health system among both real and legal persons in all courses such as education, treatment, and researches.
The most causes of conflict of interest are named as deferent goals, lack of resources, authorities malfunction, health marketing and etc.
We aimed at discussing conflict of interest and its relation to law, its management, conflict of interest in pharmacy and pharmaceutical companies and also Iranian legal system viewpoint. In conclusion it seems that conflict of interest should be included in the law and the provisions to achieve the least conflict of interests in health system should be revised.