Fig. 2

Drug alerting rule authoring tool. a Main page for editing drug rules. The left panel is the drug list, where user can click one to edit. On the right side is the edit area, which contains three tab pages: basic info, interactions and contraindications. Basic info tab page defines basic rules such as skin test, dosage, etc. b Tab page for editing drug–drug interactions. Users can select drugs that have interactions with the current one. c Tab page for editing contraindication rules. Left panel is the context item (e.g. lab test, symptoms, vital signs, etc.) list used to define contraindicated conditions. The right side is a table of user-selected context items, and a graphical rule composer, as well as a textual rule expression editor