Azvudine (RO-0622) hydrochloride displays strong inhibition on wild-type HIV-1IIIB and HIV-1RF with an EC50 ranging from 30 to 110 pM. The EC50 values of Azvudine hydrochloride against HIV-1KM018, HIV-1TC-1 and HIV-1WAN T69N are 6.92, 0.34 and 0.45 nM, respectively. Azvudine is sensitive to NRTIs-resistant strain HIV-174V, PIs-resistant strains HIV-1L10R/M46I/L63P/V82T/I84V and HIV-1RF V82F/184V, and FIs-resistant strain pNL4-3gp41 (36G) V38A/N42T. The EC50 values of Azvudine hydrochloride against these resistant strains are 0.11, 0.14, 0.37 and 0.36 nM respectively.