An automated drug delivery and monitoring system for use on mechanically ventilatedpatients in the intensive care unit is presented. Medication in the form of respirableparticles is transported through ventilator circuitry by a delivery unit. Multiplemedications may be delivered into the gas flow of the ventilator, with each medicationdelivered in a defined dose for a frequency and interval as specified by an operator.The particles mixed into the gas flow of the ventilator are inhaled and ingestedby the patent's lungs.