A patient care management system for assisting a physician in monitoring drug use by a patient. The system receives drug dispensation data for a drug, on the basis of which the system determines drug supply availability data. The drug supply availability data is indicative of periods of time during which the drug was available in non-duplicate supply, or in oversupply, or in insufficient supply. The periods of time are displayed with respect to a common time base. Each degree of supply availability is visually displayed via a graphical user interface using, e.g., a color coded scheme, so as to be distinguishable by a user. This allows a physician to rapidly assess over-consumption or compliance problems. Plural drugs may be monitored on a single display screen. The system may also be adapted to allow an prescribing physician to assess refill compliance, hospitalization periods and prescription drug costs.