Implementation of The Fuzzy Inference System to Determine The Amount of Purchase of Supplement Drug Products Based on Inventory and Sales Data at XYZ Pharmacy

Abstract

The Health Service Industry is one of the important and crucial industries to be maintained in order to support the welfare of the community. XYZ Pharmacy, which is located in the Jakarta area, is one of the industrial companies engaged in Health Services and focuses on the skin and genital area. The need for planning the number of purchases of medicinal products for Inventory at XYZ Pharmacy is very important. It was found that there were problems with the company, namely experiencing a very large amount of stock and decreasing stock in supplement products so that many products expired and lost customer trust. The purpose of this study was to determine the number of drug purchases at XYZ Pharmacy to reduce decreasing or excess drug stock. The method used in this study is the Fuzzy Sugeno and Fuzzy Mamdani method. The application of the Fuzzy Sugeno and Fuzzy Mamdani methods uses three variables, namely: the number of inventories, the number of sales, and the number of drug purchases with the help of MATLAB software. Determination of safety stock and reorder points conducted by XYZ Pharmacy is carried out to minimize inventory running out which has an impact on customer satisfaction levels. The results of this study are In Fuzzy Mamdani's calculation, the Enervon C Tab Strip 4S/25 STRP product has a fulfilled presentation result of 79%. In Fuzzy Sugeno's calculation, the Enervon C Tab Strip 4S/25 STRP product has a fulfilled presentation result of 31%. It can be concluded that the application of Fuzzy Mamdani is better than the Fuzzy Sugeno method for calculating the inventory of Enervon C Tab Strip 4S/25 STRP products. In the calculation of the Safety Stock of the Enervon C Tab Strip 4S/25 STRP product, the results are 75 packs per month with reorder points of 80 packs per month for Calcium Carbonat + Vitamin D3 400 of 61 packs per month with reorder points of 65 packs per month.