Clinical Study

Early Therapeutic Drug Monitoring for Isoniazid and Rifampin among Diabetics with Newly Diagnosed Tuberculosis in Virginia, USA

Table 2

Distribution of estimated peak concentrations ( ) for isoniazid and rifampin.

DrugDiabetics (early TDM)Nondiabetic slow responders (standard TDM) value

Rifampin  (expected range 8–24  g/mL)
Mean    g/mL ± SD
Below expected range (%N)12 (60)4 (41)

Isoniazid (daily)  (expected range 3–6  g/mL)
Mean g/mL ± SD
Below expected range (%N)11 (65)5 (63)

Isoniazid (intermittent) (expected range 9–18  g/mL)
Mean g/mL ± SD
Below expected range (%N)3 (75)1 (17)

TDM: therapeutic drug monitoring (see Figure 1).