Formularies

Express Scripts develops formularies based on the following principles:
1. Our primary concern is clinical appropriateness, not drug cost.
2. The final decision for a patient’s drug therapy always rests with the physician.
3. We rely on objective evaluations from independent physicians.
To learn about how Express Scripts develops its national formularies, download our white paper: Formulary Development at Express Scripts.

National Preferred Formulary (NPF)
Since 2014, the NPF – which now includes about 600 brand-name drugs and 99% of all generics – has excluded medications that don’t provide greater clinical value than lower-cost alternatives. Most exclusions have more affordable options and we work with physicians to prescribe those drugs for members. As we’re not owned by any drug manufacturer, our partners and patients can be sure medication decisions are based on clinical quality and cost-effectiveness. To learn about how the NPF generates significant savings, download our value report.

National Preferred Flex Formulary
The National Preferred Flex Formulary creates a pathway to a more sustainable drug-pricing model. By giving plans and members access to authorized alternative products, Express Scripts is helping to lower out-of-pocket costs for members and reduce reliance on brand rebates.

How the Flex Formulary works
When a manufacturer introduces an authorized, lower-cost alternative to a brand-name drug, Express Scripts evaluates it for placement on the National Preferred Flex Formulary. If appropriate, the more affordable alternative is added to the formulary and enrolled members gain immediate access to it. The more costly brand-name drug and potentially other drugs in the therapy class are then excluded from coverage.