Tag: NTI drugs

Using expired Narrow Therapeutic Index (NTI) drugs like warfarin or lithium can be fatal. Learn why these medications have zero tolerance for potency loss and how to manage them safely.

Prior authorization for NTI drugs like levothyroxine and phenytoin often blocks brand-name versions despite safety risks. Learn why insurers require them, how state laws are changing, and what to do if your prescription is denied.