Comparison of pharmacokinetics of two antituberculosis dual-drug regimens. Pharmacokinetic profiles of isoniazid, rifampin, and rifapentine were normalized to their respective MICs to generate the plots. (A) Isoniazid (900 mg) + rifapentine (600 mg). (B) Isoniazid (900 mg) + rifampin (600 mg). Symbols: isoniazid, white line; rifampin/rifapentine, black line. Source: Xilin Zhao, unpublished.