PID
Patient ID number which is a unique identifier for an
individual patient.
Start_time, End_time
Start_time specifies the date and time the medicine was
administered and End_time specifies the date and time the
medicine stopped being administered (where applicable).
Drug_name, Dose, Drug_units
Drug_name specifies the name of the medicine being
administered, Dose is the dose of the medicine, and Drug_units
is the unit associated with the Dose.