CYP3A4 and COVID-19: Jingyin granules and Qingfei Paidu decoction, have been recommended for treating the H1N1 influenza A virus infection and COVID-19 in China, and have exhibited an inhibitory effect on CYP1A, CYP2A6, CYP2C8, CYP2C9, CYP2D6, CYP2E1, CYP2C19 and CYP3A (Zhang et al., 2021b; Zhang et al., 2021c).