Repeated oral dose toxicity study on hydrolysable tannin rich fraction isolated from fruit pericarps of Terminalia chebula Retz in Wistar albino rats

Terminalia chebula fruits are one of the richest sources of hydrolysable tannins and it is well known medicinal agent in traditional systems of medicine for treatment of various chronic ailments. In the present study, hydrolysable tannin rich fraction (HTF) was isolated from 80% hydroalcoholic extract of Tenninalia chebula fruit pericarps and it was studied for acute and repeated dose oral toxicity in Wistar albino rats. HTF did not show any toxic symptoms or mortality at single dose administration of 5000 mg/kg/p.o followed by observation for 14 days. On repeated dose 28 days oral toxicity study, administration of HTF at 1000 mg/kg showed marked reduction in body weight, food intake and water intake when compared with vehicle control. It was also observed that HTF could increase serum urea, glucose and AST level significantly when compared with vehicle control indicating mild disturbances in liver and kidney functions. On histopathological screening, HTF treatment showed a mild granulomatous inflammation in the liver and all other organs remained normal. It was concluded that following 28 days repeated dose oral administration, HTF caused mild disturbances in liver and kidney function which was indicated by reduced body weight, food and water intake, serum parameters and histological observations.