Objectives Sulfamethoxazole-trimethoprim (SMX-TMP) is one of the most frequently used antibiotics. SMX is metabolized by N -acetyltransferase (NAT) and cytochrome P450 2C9 (CYP2C9) to nontoxic or toxic intermediates. Little is known about the association between genetic variations of these enzymes and SMX-TMP-induced liver injury (SILI). The aim of this study was to explore the genetic polymorphisms of NAT2 and CYP2C9 and the susceptibility to SILI in a Han Chinese population. Methods A total of 158 patients with SILI and 145 controls were recruited in this study. PCR-based genotyping with matrix-assisted laser desorption ionization-time of flight was used to assay the major NAT2 and CYP2C9 genotypes including NAT2 rs1495741, rs1041983, rs1801280, CYP2C9 rs1799853, rs1057910 and rs4918758. Results The SILI group had a higher frequency of the NAT2 rs1495741 variant AA genotype and rs1041983 variant TT genotype than the controls (42.4 vs. 25.5%; P ?=?0.008, and 40.5 vs. 25.5%; P ?=?0.022, respectively). The SILI group had more slow acetylators than the controls (43.7 vs. 25.5%; P ?=?0.001). There were no significant differences in the genetic variations of CYP2C9 between the SILI and control groups. After adjusting for confounding factors, the NAT2 slow acetylators still had an increased risk of SILI (adjusted OR: 2.49; 95% confidence interval: 1.46–4.24; P ?=?0.001), especially in those with hepatocellular and mixed type SILI. Conclusions NAT2 slow acetylators are associated with a higher risk of SILI in the Han Chinese population. However, CYP2C9 genetic polymorphisms are not associated with the susceptibility to SILI.
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