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Narrow Therapeutic Index Drugs: FDA Experience, Views, and Operations.
Mark Donnelly1, Lanyan Fang1, Rajanikanth Madabushi2
1Division of Quantitative Methods and Modeling (DQMM), Office of Research and Standards (ORS), Office of Generic Drugs (OGD), Center for Drug Evaluation and Research (CDER), U.S. Food and Drug Administration (FDA), Silver Spring, Maryland, USA.
Clinical Pharmacology and Therapeutics
|November 12, 2024
Summary
The U.S. Food and Drug Administration (FDA) is refining criteria for narrow therapeutic index (NTI) drugs to ensure generic drug safety. These efforts aim to build public trust in NTI medications.
Area of Science:
- Pharmacology
- Drug Regulation
- Pharmaceutical Science
Background:
- The U.S. Food and Drug Administration (FDA) defines narrow therapeutic index (NTI) drugs by their potential for serious adverse events or therapeutic failures due to small dose or concentration changes.
- FDA is actively working to establish clear NTI assessment criteria and foster confidence in generic NTI drug products through various initiatives.
- The NTI Drug Working Group was established in 2015 to create a standardized method for identifying NTI drugs and addressing related scientific and regulatory challenges transparently.
Purpose of the Study:
- To outline the FDA's ongoing efforts and established working group dedicated to defining and assessing narrow therapeutic index (NTI) drugs.
- To detail the characteristics and criteria used by the NTI Drug Working Group for evaluating potential NTI drug products, using theophylline as a case example.
- To highlight the current status of NTI drug designations and emphasize the importance of harmonizing definitions for regulatory consistency.
Main Methods:
- Review of FDA definitions and initiatives related to narrow therapeutic index (NTI) drugs.
- Analysis of the formation and objectives of the NTI Drug Working Group.
- Examination of the five general characteristics used for NTI drug evaluation, exemplified by theophylline.
- Compilation of data on currently designated NTI drug products and their active ingredients.
Main Results:
- As of January 5, 2024, 33 drug products, encompassing 14 distinct active ingredients, are officially designated as NTI drugs.
- Product-specific guidances (PSGs) are utilized for generic drug development concerning these NTI drugs.
- The NTI Drug Working Group employs a five-characteristic framework for evaluating potential NTI drugs.
Conclusions:
- The FDA's structured approach, including the NTI Drug Working Group, aims to enhance the safety and reliability of generic narrow therapeutic index (NTI) drugs.
- Continued collaboration and harmonization of NTI definitions across agencies are crucial for improving clarity and consistency in drug development and regulatory review.
- The ongoing efforts signify a commitment to safeguarding patient health by ensuring the therapeutic equivalence of generic NTI medications.
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