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Starting from our previous finding of 14 known drugs as inhibitors of the main protease (M^pro) of SARS-CoV-2, the virus responsible for COVID-19, we have redesigned the weak hit perampanel to yield multiple noncovalent, nonpeptidic inhibitors with ca. 20 nM IC₅₀ values in a kinetic assay. Free-energy perturbation (FEP) calculations for M^pro-ligand complexes provided valuable guidance on beneficial modifications that rapidly delivered the potent analogues. The design efforts were confirmed and augmented by determination of high-resolution X-ray crystal structures for five analogues bound to M^pro. Results of cell-based antiviral assays further demonstrated the potential of the compounds for treatment ofmore » COVID-19. In addition to the possible therapeutic significance, the work clearly demonstrates the power of computational chemistry for drug discovery, especially FEP-guided lead optimization.« less