FNV-23-B was the antiviral drug developed to "counteract" FNV-23, or the Gray Death, the plague that struck the planet Sedesia. This cure was also created by the Galactic Empire, and every dose contained tiny globules of FNV-23 held within a polysaccharide coating. When digested, it released a new strain of FNV-23 into the system, thereby requiring another dose of the "cure."