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Quarterly Washington Preferred Drug Lists


Quarter One


 Quarter Four

Drug class updates

Below are the Therapeutic Interchange Program announcements and updates to drug classes covered under the Washington Preferred Drug List.

Drug status on the PDL

Defining a drug’s “preferred” or “non-preferred” status on the PDL:

  • A “preferred” drug on the PDL is not subject to the Therapeutic Interchange Program (TIP).
  • A “non-preferred” drug on the PDL is subject to TIP when it is included in a Drug Effectiveness Review Project (DERP) report.
  • If a drug is part of a PDL drug class, but it has not been reviewed by DERP, it is considered "non-preferred". It is not subject to TIP or dispense as written, and will be covered according to each program's benefit design.

Selection process of preferred drugs on the PDL


For archived announcements on a drug class
Leta Evaskus
Phone: 206-521-2029