A drug monitoring tool comprises a data receiver and an interactive user interface. The data receiver is configured to receive a pharmacokinetic (PK) profile of a patient. The interactive user interface is configured to display, to the patient, a time-varying therapeutic plasma protein level of the patient and delineate a plurality of zones within the interactive user interface associated with the time-varying therapeutic plasma protein level. The plurality of zones includes a safe zone indicating to the patient that the time-varying therapeutic plasma protein level is within a first concentration range considered safe for physical activity and a danger zone indicating to the patient that the time-varying therapeutic plasma protein level is within a second concentration range and physical activity should be limited.