https://www.fda.gov/drugs/cder-conversations/setting-and-implementing-standards-narrow-therapeutic-index-drugs
Setting and Implementing Standards for Narrow Therapeutic Index Drugs | FDA
CDER's Narrow Therapeutic Index Drugs (NTI) working group works to resolve key NTI scientific and regulatory issues.
narrow therapeutic indexsettingimplementingstandardsdrugs
https://www.fda.gov/industry/generic-drug-user-fee-amendments/fy2016-regulatory-science-report-narrow-therapeutic-index-drugs
FY2016 Regulatory Science Report: Narrow Therapeutic Index Drugs | FDA
narrow therapeutic indexregulatory sciencefy2016reportdrugs