Introduction: Prescriptive authority for nurses has moved forward significantly in some countries. However this authority hasn't come about for Iranian nurses. We aimed to perform this study in order to find out factors that affecting on prescriptive authority in Iranian nurses.       Methods: A qualitative approach was used in Jahrom and Shiraz. A sample was chosen based on purposeful sampling method amongst stuff and student nurses. Sample size was dependent on the data saturation with a total 10 participants at the end. Data gathering was done using semi-structured interviews, then data were analyzed by qualitative content analysis. 

   Results: Four main themes emerged: (a) competency, (b) legal license, (c) change and (d) promotion.

 Conclusion: The results of this study revealed that prescription by Iranian nurses is possible if the law centers support and verify the prescription task. But since these conditions has not been achieved thus they are needed to more thinking planning and training