Phenobarbital Drug Level Monitoring - Phenobarbital Serum Level Test

This test measures the serum concentration of phenobarbital, one of the oldest and most widely used barbiturates as an antiepileptic and sedative-hypnotic. Measuring its blood level is a crucial part of therapeutic drug monitoring (TDM) due to its narrow therapeutic margin (the difference between the effective and toxic dose) and numerous drug interactions.