In 35 patients receiving efavirenz 600 mg once daily, steady-state peak concentration (Cmax) was 12.9 ± 3.7 µM (29%) [mean ± standard deviation (S. D.) (coefficient of variation (%CV))], steady-state Cmin was 5.6 ± 3.2 µM (57%), and AUC was 184 ± 73 µM• h (40%).