The efficiency of pharmaceutical inventory is aimed not only at cost reduction but also at ensuring the continuity of patient care. To achieve pharmaceutical inventory efficiency, pharmaceutical inventory control, hospital formulary addendums, and physician adherence are required. The objective of this study is to analyze the effect of hospital formulary addendums and physician adherence to formulary-based prescribing on pharmaceutical inventory efficiency, with inventory control as an intervening variable.This research is confirmatory in nature and uses a quantitative approach. The sample consists of secondary data derived from observations of patient prescriptions at BSH Hospital over a 28-month period, from January 2022 to April 2024. The F-test concluded that hospital formulary addendums, physician adherence to prescribing, and pharmaceutical inventory control simultaneously influence pharmaceutical inventory efficiency. Using SEM-PLS analysis, it was found that pharmaceutical inventory control has a significant effect on pharmaceutical inventory efficiency. Furthermore, SEM analysis via JASP (Jeffrey's Amazing Statistics Program) showed that physician adherence to formulary-based prescribing has a direct influence on pharmaceutical inventory efficiency and also an indirect influence through inventory control. In contrast, hospital formulary addendums in this study were not proven to have either a direct or indirect effect on pharmaceutical inventory efficiency through inventory control.

Non-formulary drug utilization in Harapan Kita Children’s and Mother’s Hospital presents a substantial challenge in healthcare cost management, especially for patients enrolled in the BPJS health insurance program. Given its status as a national referral hospital, Harapan Kita Children’s and Mother’s Hospital encounters a high prevalence of complex maternal and child health cases requiring the use of medications beyond the scope of the national formulary. This research endeavor seeks to examine the patterns and consequences of non-formulary drug use within this context. This study adopted a quasi-experimental design, incorporating both quantitative and qualitative methods, to evaluate the impact of an sosialisation intervention and audit clinic on physician compliance with formulary drug use. A pre-test and post-test design was employed to measure changes in non-formulary drug utilization. Findings indicated a statistically significant decrease in non-formulary drug use from 18% to 13% post-intervention. The integration of a clinical pathway and tailored physician training was instrumental in achieving improved formulary adherence. Given these results, it is recommended to broaden training and surveillance programs, strengthen technological support through the implementation of formulary information systems, and undertake longitudinal research to assess the long-term sustainability of the intervention's effects..