NTI drugs have a tiny margin between effective and toxic doses. Common examples include warfarin, digoxin, lithium, phenytoin, and tacrolimus. Even small changes in dose or brand can cause serious harm. Monitoring and careful management are essential.
Finding the right medication dose isn't one-size-fits-all. Learn how age, genetics, and kidney function affect your treatment, why some drugs need close monitoring, and how to work with your care team to avoid dangerous side effects.
Therapeutic drug monitoring helps protect patients on generic HIV drugs with narrow therapeutic indexes by measuring blood levels to prevent toxicity and treatment failure. It's essential for specific cases but not routinely used.