P Pharmaceutical company PT XYZ produces Medicine X which is distributed by adistributor company with 25 Branch Warehouses. Currently, PT XYZ’s supplyplanning for Medicine X is based on The Single Moving Average (N=3)forecasting method. The problem that emerges is the frequent occurrence ofshortages and excess supply of Medicine X at each Branch Warehouse whichaffects the achievement of sales at PT XYZ and service level to customers. Thisresearch aims to produce a demand forecasting model for Medicine X at eachBranch Warehouse that approximates actual demand using the ARIMA method.The research methodology begins with forecasting demand using the ARIMAmethod. Periodic Review inventory policy uses the results of demand forecastingusing ARIMA Method to determine the Medicine X supply quantity and theoptimal inventory point at the Branch Warehouse. Distribution RequirementPlanning is used to the scheduled delivery of Medicine X supplies to 25 BranchWarehouses for the next 12 weeks planning period. The implementation of theARIMA forecasting method is carried out at 25 Branch Warehouses. The detailedcalculations in this research used Branch Warehouse No 15 which gave ARIMAMSE value of 30.997,21. This result is 63,21% better than the SMA3 method. Thenext step, determine the inventory policy using Periodic Review which willreview shipments every week to 25 Branch Warehouses. The Optimal inventorylevel at Branch Warehouse No 15 is 1177 bottles and each Branch Warehouse hasa different optimal level. Distribution Requirement Planning for the 25 BranchWarehouses is determined based on the results of The Periodic Review to obtainthe quantity and time of medicine delivery to each Branch Warehouse.