Switching to generic medications is common, but for Narrow Therapeutic Index (NTI) drugs, it can require dose adjustments. Learn why bioequivalence doesn't always mean clinical equivalence and how doctors monitor for necessary changes.
Twenty-seven U.S. states have special rules restricting generic substitution for narrow therapeutic index drugs like warfarin, levothyroxine, and lithium. Learn which states block swaps, require consent, or allow changes - and what it means for your health.
