Keshia Glass

31 Jan 2026

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Multiple Manufacturers: NTI Drugs and Switching Between Generics

Multiple Manufacturers: NTI Drugs and Switching Between Generics

NTI drugs like warfarin, levothyroxine, and lithium have a narrow safety margin. Switching between generic manufacturers can affect blood levels and cause serious side effects-even when FDA-approved. Learn how to protect yourself.

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