A medication risk mitigation method utilizing three interventions: a prospective intervention performed by a prescriber, a concurrent intervention performed by a pharmacist and a retroactive intervention performed by a pharmacist. At each intervention, the system of the instant invention utilizes a computer program to compare each prescribed medication to a series of intrinsic and extrinsic data sources in order to identify potential contraindications and, if necessary, modify a prescription. The system also permits secure messaging between prescribers and pharmacists, each with access to the computer program, so as to facilitate communication and reduce medication risks. The system of this invention also permits modeling for hypothetical medication modifications based on the same intrinsic and extrinsic data sources.