EFdA-TP tetrasodium is a potent nucleoside reverse transcriptase (RT) inhibitor. EFdA-TP tetrasodium inhibits RT-catalyzed DNA synthesis as an effective immediate or delayed chain terminator (ICT or DCT). EFdA-TP tetrasodium inhibits HIV-1 RT with multiple mechanisms. EFdA-TP (tetrasodium) is a click chemistry reagent, it contains an Alkyne group and can undergo copper-catalyzed azide-alkyne cycloaddition (CuAAc) with molecules containing Azide groups.