Tag: state pharmacy regulations

NTI-specific substitution laws: which states have special rules
Gina Lizet Mar, 15 2026

NTI-specific substitution laws: which states have special rules

Twenty-seven states have special rules blocking or restricting generic substitution for Narrow Therapeutic Index (NTI) drugs like warfarin and levothyroxine. These state laws override FDA guidelines and create a patchwork of requirements - from mandatory consent to outright bans.

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