This report includes the microbiological determination of Rifampicin (RMP) serum levels in 26 chronic tuberculous Egyptian patients who received the drug for the first time. RMP mean serum levels at 3 and 6 hours after its oral administration in therapeutic doses (450/600 mg daily), were 5.01 micrograms/ml (S.D. + or - 3.14) and 3.53 micrograms/ml (S.D. + or - 1.3) respectively. RMP serum levels at 3 and 6 hour samples exceeded 0.2 micrograms/ml in all patients. (Author)
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