Table 4.

Effects of flavonoids on CYP3A4 isozyme activities (x ± s, n = 3).

Concentration (μM)	Inhibition Rate (%)
	Ketoconazole	Quercetin	Kaempferol	Isoquercitrin	Astragalin
5	87.28 ± 6.55	33.18 ± 1.96	26.20 ± 1.81	16.68 ± 1.00	6.65 ± 0.41
1	76.11 ± 5.25	24.97 ± 1.77	20.00 ± 1.28	13.31 ± 0.63	2.57 ± 0.19
0.2	47.33 ± 3.08	22.41 ± 1.46	17.70 ± 0.80	13.04 ± 1.11	2.22 ± 0.14
0.1	22.95 ± 1.08	15.79 ± 1.23	14.12 ± 0.55	10.62 ± 0.62	0.51 ± 0.04
0.02	14.72 ± 0.56	15.04 ± 0.83	10.98 ± 0.87	9.03 ± 0.35	0.42 ± 0.04