The present invention concerns compositions comprising at least one
niclosamide compound, such as
niclosamide or a pharmaceutically acceptable salt thereof, and at least one permeability
enhancer, such as
glycerol or dimethylpalmityl-ammonio propanesulfonate (PPS), and their use of such compositions as
niclosamide agents. Advantageously, the niclosamide compound is capable of being transported across a Caco-2
cell membrane by at least 150% relative to the amount capable of being transported across the Caco-2
cell membrane in the absence of the permeability
enhancer. Compositions, including oral dosage forms, and methods for delivering niclosamide compounds, such as for treatment or prevention of
human coronavirus infections, are also provided.