The Plan participates in Express Scripts’ National Preferred Formulary. The formulary is a broad list of preferred medications used by Express Scripts clients nationwide and is subject to change from time to time. If your medication is removed from Express Scripts’ formulary, you will be notified in advance and inform you of alternative drugs available to you in the same therapeutic class. Medications not on the National Preferred Formulary are not covered by the Plan. The Plan also excludes certain types of medications, however, therapeutic alternatives within the same medication class are covered under the Plan.