What is a formulary in the context of an insurance plan?

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A formulary is the insured plan’s approved list of medications, organized to favor lower-cost and typically evidence-based choices. By design, it guides patients toward generic and other preferred drugs, which usually come with lower copays or better coverage. Drugs on the formulary have been reviewed for safety, effectiveness, and value, so sticking to these options helps control overall plan costs while still aiming for good patient outcomes. Medications not on the formulary or placed in higher-cost tiers may require higher out-of-pocket costs or special authorization, which is why it isn’t simply a complete catalog of all possible medicines. It’s focused on prescription drugs and cost-efficient access, not a registry of every FDA-approved drug or a dosing guideline, and it isn’t limited to over-the-counter products.