DISCUSSION
In the present study, the results showed that the PM could produce mild skin irritation in rabbits but could not produce skin sensitization in guinea pigs. The dermal LD50 in Wistar rats was more than 2,000 mg/kg body weight. The acute dermal toxicity test is initially conducted with the aim to establish a dosage regimen in subchronic and other studies, and may provide
initial formation on the mode of the toxic action of test substance. Dosing animals with test
substance at the dose of 2,000 mg/kg body weight is generally considered high enough and
if no mortality or significant toxic signs are seen in animals receiving this dose, no higher doses are required for further study.9 In the previous studies, the toxicity of the ethanolic extract of Phlai rhizome has been reported. The oral LD50 of Phlai rhizome extract in rats was 20 g/kg body weight and there was no toxic effect when intraperitoneally (i.p.) injection of this extract at the dose of 10 g/kg body weight to the rats