THE PRESENT INVENTION PROVIDES AN FTD AND TPI-CONTAINING ORAL PHARMACEUTICAL COMPOSITION WHICH CAN BE ORALLY ADMINISTERED AND IS STABLE EVEN UNDER HIGH HUMIDITY CONDITIONS. AN ORAL PHARMACEUTICAL COMPOSITION COMPRISING a, a, a-TRIFLUOROTHYMIDINE AND 5-CHLORO-6-(2-IMINOPYRROLIDINE-L-YL)METHYL-2, 4 (1H, 3H)-PYRIMIDINE DIONE HYDROCHLORIDE AS AN ACTIVE INGREDIENT; AND BEING SUBSTANTIALLY FREE OF AN ADDITIVE COMPRISING A METAL SALT.