4-Methoxytoluene was given by gavage to 4 groups of 20 rats at dosage
levels of 0, 40, 120 or 240 mg kg(-1) body weight/day for 4 weeks. The
re was a statistically significant decrease in serum creatinine and ur
ea in the intermediate and high dose group for both sexes. Among males
, a statistically significant decrease in the packed cell volume was o
bserved in the high and intermediate dose group. A no-observed-effect
level of 40 mg kg(-1) body weightiday was determined.