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Erythromycin breath tests (ERBT) were performed to determine age and racial effects on CYP3A4-mediated hepatic clearance in hypertensive men (n = 43) in the clinical setting. Older hypertensive African American men (n = 19: 71 +/- 8 years, mean +/- SD) had faster ERBT clearance compared with Caucasian (n = 20: 72 +/- 6 years) hypertensive men (at 20 minutes after dosing: 0.042 +/- 0.01 percent dose/min exhaled vs. 0.033 +/- 0.013; at 60 minutes after dosing: 0.030 +/- 0.05 vs. 0.023 +/- 0.007 percent dose/min exhaled; ANOVA, p = 0.007), while age, smoking, and reported alcohol intake did not affect ERBT. The data suggest faster hepatic CYP3A-mediated clearance in African American men compared with Caucasian men, and that race may significantly affect CYP3A-mediated hepatic clearance in patients treated for hypertension.
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