1. According to Hodge and Sterner's classification for oral administration to rats, Tabex belongs to the group of strongly toxic drugs with a good absorption index.
2. When given orally to rats for 30 and 90 days, Tabex shows no toxic changes in the hemopoiesis and internal organs of the experimental animals.
3. When applied orally to mice for 45 days and to rats and dogs for 180 days, Tabex does not cause any toxic changes in the hemopoiesis and in the internal organs, except different degrees of dystrophic changes in the liver.