Bone Penetration of Cycloserine in Osteoarticular Tuberculosis Patients of China

The cycloserine concentrations in plasma and bone that were collected during operations on 28 osteoarticular tuberculosis (TB) patients treated daily with a 500-mg cycloserine-containing regimen were determined. The median concentrations in plasma and bone were 16.29 μg/mL (interquartile range [IQR], 6.47 μg/mL) and 24.33 μg/g (IQR, 14.68 μg/g), respectively. The median bone/plasma penetration ratio was 0.76 (range, 0.33 to 1.98). Cycloserine could effectively penetrate bone and acquire concentrations comparable to those in plasma, which favors its usage in osteoarticular TB treatment.