diff --git a/backend/app.py b/backend/app.py
index a4da214..ab26c9a 100644
--- a/backend/app.py
+++ b/backend/app.py
@@ -9730,13 +9730,14 @@ def api_stock_daily_trend():
         cursor = conn.cursor()
         
         # 특정 약품 또는 전체 일별 입출고 집계
+        # credit=출고, debit=입고 (약국 재고 기준)
         if drug_code:
             # 특정 약품
             cursor.execute("""
                 SELECT 
                     IM_DT_appl as date,
-                    SUM(ISNULL(IM_QT_sale_credit, 0)) as inbound,
-                    SUM(ISNULL(IM_QT_sale_debit, 0)) as outbound
+                    SUM(ISNULL(IM_QT_sale_debit, 0)) as inbound,
+                    SUM(ISNULL(IM_QT_sale_credit, 0)) as outbound
                 FROM IM_date_total
                 WHERE IM_DT_appl >= ?
                   AND IM_DT_appl <= ?
@@ -9749,8 +9750,8 @@ def api_stock_daily_trend():
             cursor.execute("""
                 SELECT 
                     IM_DT_appl as date,
-                    SUM(ISNULL(IM_QT_sale_credit, 0)) as inbound,
-                    SUM(ISNULL(IM_QT_sale_debit, 0)) as outbound
+                    SUM(ISNULL(IM_QT_sale_debit, 0)) as inbound,
+                    SUM(ISNULL(IM_QT_sale_credit, 0)) as outbound
                 FROM IM_date_total
                 WHERE IM_DT_appl >= ?
                   AND IM_DT_appl <= ?
@@ -9819,14 +9820,14 @@ def api_stock_top_usage():
         
         drug_session = db_manager.get_session('PM_DRUG')
         
-        # 출고량 기준 TOP N
+        # 출고량 기준 TOP N (credit=출고, debit=입고)
         query = text("""
             SELECT TOP(:limit)
                 D.DrugCode as drug_code,
                 G.GoodsName as product_name,
                 G.SplName as supplier,
-                SUM(ISNULL(D.IM_QT_sale_debit, 0)) as total_outbound,
-                SUM(ISNULL(D.IM_QT_sale_credit, 0)) as total_inbound,
+                SUM(ISNULL(D.IM_QT_sale_credit, 0)) as total_outbound,
+                SUM(ISNULL(D.IM_QT_sale_debit, 0)) as total_inbound,
                 ISNULL(IT.IM_QT_sale_debit, 0) as current_stock
             FROM IM_date_total D
             LEFT JOIN CD_GOODS G ON D.DrugCode = G.DrugCode
@@ -9834,7 +9835,7 @@ def api_stock_top_usage():
             WHERE D.IM_DT_appl >= :start_date
               AND D.IM_DT_appl <= :end_date
             GROUP BY D.DrugCode, G.GoodsName, G.SplName, IT.IM_QT_sale_debit
-            ORDER BY SUM(ISNULL(D.IM_QT_sale_debit, 0)) DESC
+            ORDER BY SUM(ISNULL(D.IM_QT_sale_credit, 0)) DESC
         """)
         
         rows = drug_session.execute(query, {
@@ -9914,11 +9915,12 @@ def api_stock_level():
         supplier = stock_row.supplier if stock_row else ''
         
         # 일별 입출고 데이터 (역순으로 누적 계산)
+        # credit=출고, debit=입고 (약국 재고 기준)
         cursor.execute("""
             SELECT 
                 IM_DT_appl as date,
-                SUM(ISNULL(IM_QT_sale_credit, 0)) as inbound,
-                SUM(ISNULL(IM_QT_sale_debit, 0)) as outbound
+                SUM(ISNULL(IM_QT_sale_debit, 0)) as inbound,
+                SUM(ISNULL(IM_QT_sale_credit, 0)) as outbound
             FROM IM_date_total
             WHERE DrugCode = ?
               AND IM_DT_appl >= ?