Washington Prescription Drug Program (WPDP)


We ensure the value of prescription drug purchasing by the state.

About us

The Washington Prescription Drug Program provides evidence-based prescription drug guidance to state agencies that purchase drugs on behalf of Washington residents. 


Our goal is to make sure Washington prescription drug consumers get safe medications with proven results at lower prices. We do this through the following methods: 

  • Our evidence-based preferred drug selection process for the Washington Preferred Drug List (WA PDL).
  • ArrayRx Solutions multistate partnership pools prescription drug purchasing power. 
  • ArrayRx prescription drug discount card available to all Washingtonians.