Effective October 15, 2016, all prescribers are required to check MassPAT each time you prescribe a Schedule II-III opioid and when prescribing a benzodiazepine or DPH-designated Schedule IV-VI drug for the first time. The MassPAT shows a patient’s prescription history for the prior 12 months. Data is reported into the MassPAT by all Massachusetts pharmacies and out-of-state pharmacies delivering to people in Massachusetts. The prescription history data informs clinical decision-making to help prevent or stop harm from duplicate drug therapy, prescription drug misuse, abuse, and diversion. This new system replaces the PMP Virtual system.