Transport and inventories account for most of a company s logistics costs. With the advancement of technology, we began to analyze these two components together and no longer separate, as was done previously. The Inventory Routing Problem (IRP) was born from this joint analysis and seeks to find the best route for the vehicles, meeting a certain level of inventory. This work presents an IRP model with multiple vehicles and products, where there is the possibility of transshipment between existing distribution centers. The developed model was elaborated in a real case study in a company of the retail sector. After its elaboration, the model was tested with a smaller instance and compared to the current situation of the company in order to test its efficiency. It was then run with the complete company data, and the results were analyzed. In the resolution, Xpress software was used, which uses integer programming as the resolution method.