Ritonavir (EC50, 8.63 µM; CC50, 74.11 µM, SI = 8.59), saquinavir (EC50, 8.83 µM; CC50, 44.43 µM; SI = 5.03), and atazanavir (EC50, 9.36 µM; CC50 > 81 µM; SI > 8.65) suppressed SARS‐CoV‐2 at less than 10 µM.