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Summary: Nucleotide/nucleoside analogs (NAs) are important compounds used in antiviral drug development. To understand the action mode of NA drugs, we present an enzymology protocol to initially evaluate the intervention mechanism of the NTP forms of NAs on a coronaviral RNA-dependent RNA polymerase (RdRP). We describe the preparation of SARS-CoV-2 RdRP proteins and RNA constructs, followed by a primer-dependent RdRP assay to assess NTP forms of NAs. Two representative NA drugs, sofosbuvir and remdesivir, are used for demonstration of this protocol.For complete details on the use and execution of this protocol, please refer to Wu et al. (2021). : Publisher’s note: Undertaking any experimental protocol requires adherence to local institutional guidelines for laboratory safety and ethics.