This rule will summarize the total amount of acetaminophen administered to a patient in the last 24 hours. If the total is less than 4000 mg, a pop-up will display the total. If the current administration will cause the total to exceed 4000 mg, a pop-up will appear allowing the user to erase or override. If the total is already over 4000 mg, the current administration must be erased. The rule utilizes a custom keyword to calculate the running total and generates appropriate messages and responses based on the total and whether it will exceed 4000 mg with the current administration.