To provide healthcare services, a great diversity of materials and medicines is used, which makes inventory management a challenge for the hospital organization, considering the need to make available large quantities of varied products. The hospital pharmacy is responsible for the management of these items, ensuring safe and rational use, as well as responding to patients' demands. In this way, effective inventory control with reliable data results in a smooth progress of the material operating processes in the institution. This paper aims to classify hospital pharmacy drugs through the XYZ rating, to calculate management indicators (accuracy, safety stock, inventory turnover and re-fulfillment point) for the five drugs that have higher demand. Thus, the current inventory system is analyzed to propose improvements for the management control of pharmacy medicines. The present work is a case study carried out in a hospital pharmacy of the municipal hospital of Marabá-PA. The main data were collected by checking the history of drug withdrawals, conversations with employees involved in the sector and work observation. The methodology followed proved to be adequate, as it generated results compared to the proposed one for the work. It was found that the study was able to achieve its objectives, because the drugs were classified as XYZ, and of the class Z drugs, five of those that obtained the most output were selected so that the indicators were calculated. From the results of the indicators, it was observed that the service provided by the pharmacy, despite functioning, is compromised. Despite the difficulties encountered, such as gaps in historical data, which resulted in the elimination of some medicines, the work concluded its objective and is configured as another source of research for inventory management, this time in a public hospital pharmacy of great importance to the health system and good care of the population.