Pharmaceutical companies face significant inventory management challenges, leading to issues such as lost sales and customer dissatisfaction due to low service levels and poor order fulfillment. This study proposes the implementation of Kanban and a Warehouse Management System (WMS) to enhance inventory visibility and operational efficiency. Kanban, through the use of cards displaying key product information—such as expiration date, batch number, and storage location—improves inventory visibility by 50% and reduces stock preparation time by 30%. Meanwhile, the WMS approach updates inventory data in real time, provides visual alerts for critical stock levels, and optimizes picking routes, resulting in a 30% reduction in picking time and an increase in service level from 85% to 95%. 

The study evaluates the impact of these tools using key performance indicators such as lost sales and on-time delivery rates. The results show significant improvements across these indicators, including a 25% reduction in Average Picking Time, thereby demonstrating the effectiveness of combining Kanban and WMS for inventory management.