diff --git a/db_logic/medicament.py b/db_logic/medicament.py
index 954d87e..58a9a07 100644
--- a/db_logic/medicament.py
+++ b/db_logic/medicament.py
@@ -984,6 +984,8 @@ class BllMedicament(Repository):
         计算用量
         :return: {"is_liquid": 是否为液体, "use_volume": 液体用量, "use_quality": 固体用量, "net_weight_unit": 单位}
         """
+        if not drug.remain:
+            return 
         medicament_variety_obj = BllMedicamentVariety().findEntity(
             EntityMedicamentVariety.variety_id == drug.variety_id)
         remain_result = {