Pirodavir is a broad-spectrum antipicornaviral agent. It is active against 80 typed (MICs = 0.001-14.4 μg/ml) and one untyped rhinovirus strain (MIC = 0.002 μg/ml) and is active against both group A and group B serotypes. It is also active against serotypes of coxsackievirus, poliovirus, and echovirus enteroviruses (MICs = 0.018-8.5, 0.025-0.27, and 0.019-1.3 μg/ml, respectively).