Toxicokinetics of naringin, a putative antitussive, after 184-day repeated oral administration in rats.

The toxicokinetic characteristics of naringin were investigated in rats that had been orally administered naringin extract, a candidate for oral treatment of cough, prepared from Citrus grandis "Tomentosa", at 50, 250, or 1250 mg/kg/day in a repeated-dose study for 1, 32, 93, or 184 days. Increased values of the mean systemic exposure were approximately proportional to increases in dose levels during all collection intervals; no saturation was observed. No significant differences in mean systemic exposure were observed between male and female rats. Results provide a reference for interpretation of toxicology findings and relevance to clinical safety issues.