BAREKENG: Jurnal Ilmu Matematika dan Terapan
Vol 20 No 3 (2026): BAREKENG: Journal of Mathematics and Its Application

AN INTEGRATIVE MODEL FOR DRUG INVENTORY OPTIMIZATION IN PHARMACIES USING WMA AND EOQ CONTINUOUS

Kwardiniya Andawaningtyas (Department of Mathematics, Faculty of Mathematics and Natural Sciences, Universitas Brawijaya, Indonesia)
Raqqasyi Rahmatullah Musafir (Department of Mathematics, Faculty of Mathematics and Natural Sciences, Universitas Brawijaya, Indonesia)
Nandia Primasari (Department of Mathematics, Faculty of Mathematics and Natural Sciences, Universitas Brawijaya, Indonesia)
Rina Adhista (Department of Mathematics, Faculty of Mathematics and Natural Sciences, Universitas Brawijaya, Indonesia)
Trya Rizky Adellia (Department of Mathematics, Faculty of Mathematics and Natural Sciences, Universitas Brawijaya, Indonesia)
Cornelia Yosefine Halim (Department of Mathematics, Faculty of Mathematics and Natural Sciences, Universitas Brawijaya, Indonesia)
Evi Ardiyani (Center for Applied Climate Services, Agency for Meteorology, Climatology, and Geophysics, Indonesia)



Article Info

Publish Date
08 Apr 2026

Abstract

Efficient drug inventory control is essential for pharmacies to maintain service quality, prevent stockouts, and reduce financial losses caused by excessive inventory. This study develops an integrative inventory optimization model combining ABC analysis, Weighted Moving Average (WMA) forecasting, and the Economic Order Quantity (EOQ) Continuous Review approach. ABC analysis identifies high-priority drugs requiring strict control, WMA forecasts demand for Category A items, and the EOQ model determines optimal order quantity, safety stock, and reorder point. Results show that the integration of forecasting and continuous review improves accuracy in estimating demand fluctuations and reduces total inventory costs compared with existing ordering practices. The originality of this work lies in formalizing the integration of WMA forecasting into EOQ Continuous Review, specifically for pharmaceutical inventory systems. Study limitations include the use of a single-pharmacy dataset, fixed lead-time assumptions, and reliance on only one forecasting method. This integrated approach provides a novel and more responsive solution for pharmaceutical inventory management, as the use of WMA enhances forecast accuracy by emphasizing recent demand shifts, while the EOQ Continuous Review model ensures optimal ordering decisions in real time. Together, these methods create a more adaptive framework that reduces uncertainty, improves stock availability, and minimizes overall inventory costs.

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Journal Info

Abbrev

barekeng

Publisher

Subject

Computer Science & IT Control & Systems Engineering Economics, Econometrics & Finance Energy Engineering Mathematics Mechanical Engineering Physics Transportation

Description

BAREKENG: Jurnal ilmu Matematika dan Terapan is one of the scientific publication media, which publish the article related to the result of research or study in the field of Pure Mathematics and Applied Mathematics. Focus and scope of BAREKENG: Jurnal ilmu Matematika dan Terapan, as follows: - Pure ...