Oxadiazolyl-phenoxyalkylisoxazoles and pharmaceutically acceptable salts thereof, compositions comprising oxadiazolyl-phenoxyalkylisoxazole compounds or pharmaceutically acceptable salts thereof and methods for using oxadiazolyl-phenoxyalkylisoxzazole compounds or pharmaceutically acceptable salts thereof as anti-picornaviral agents are described herein. The methods include using pleconaril as a prodrug for conversion to anti-picornaviral compounds in vivo.