Patent No. 595542 Disclosed is a tablet containing (1) 6-fluoro-3-hydroxy-2-pyrazinecarboxamide or a salt thereof, (2) a low substituted hydroxypropyl cellulose or croscarmellose sodium and (3) a binder, wherein the amount of 6-fluoro-3-hydroxy-2-pyrazinecarboxamide or a salt thereof contained in therein is 50 to 95% of the mass of the tablet.