The biopsy was not cultured for mycobacteria. Chemotherapy for TB was started with isoniazid 300 mg once daily, rifampin 600 mg once daily, ethambutol 1,200 mg once daily and pyrazinamide 2,000 mg ...
Serum concentrations of isoniazid reach a peak at two or three hours after a test dose of 3 or 4 mg. per kilogram of body weight, and no biologically active drug (that is, less than 0.2 microgm.
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