“…Some low-molecular-weight inducers, such as tilorone hydrochloride (18), quinacrine (10), BL-20803 (24), CP-20961 (12), and cycloheximide (30), were also examined for their antiviral effects, with unencouraging results. Tilorone hydrochloride (18), an orally active inducer in mice, and CP-20961, which has a high therapeutic index (300) in the infection model of vesicular stomatitis virus, showed little, if any, protective activity against influenza virus infection in mice (12). Cycloheximide induced circulating interferon only at the level at which it coincidentally inhibited protein synthesis in animals (30).…”