[A subacute oral toxicity study of T-2588 in juvenile rats].

A subacute toxicity study on T-2588 was carried out in juvenile rats (6 days-old 48 males and 48 females) by oral administrations at dose levels of 250, 500 and 1,000 mg/kg/day for 1 month. The results obtained were summarized below. During the study, there were no clinical signs considered to be related to the treatment. There were no T-2588-related abnormalities in urinalysis, hematological examinations, biochemical examinations and ophthalmological examinations. Slight increases in relative liver and kidney weights were observed in the 1,000 mg/kg-treated group and slight increases in relative kidney weight were detected in the 500 mg/kg-treated female group. Histologically, however, T-2588-related abnormality was not observed. The maximum safety dose of T-2588 was estimated to be 250 mg/kg/day. In addition to the above examinations, male reproductive performance was examined in the group administered with a dose level of 1,000 mg/kg/day. No adverse effects were observed in male fertility and F1 generation.