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Tag: narrow therapeutic index

NTI-specific substitution laws: which states have special rules for generic drug swaps
23 Feb 2026

NTI-specific substitution laws: which states have special rules for generic drug swaps

Twenty-seven U.S. states have special rules blocking or restricting generic substitution for narrow therapeutic index drugs like warfarin and levothyroxine. Learn which states restrict swaps, why they exist, and how they affect patients and pharmacies.

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