Learn how to request a tier exception to lower your medication copays. Save hundreds a year by moving high-cost drugs to lower tiers with proper medical documentation.
Prescriber Attitudes Toward NTI Drugs and Substitution: What Doctors Really Think
Prescribers remain cautious about substituting generic drugs for narrow therapeutic index (NTI) medications due to risks of therapeutic failure or toxicity. Despite FDA assurances, many doctors prefer brand-name NTI drugs for stability, especially with warfarin, levothyroxine, and tacrolimus. State laws, communication gaps, and real-world errors fuel ongoing debate.