Central inhibitory activity of the aqueous extract of Crinum giganteum.

The aqueous extract of Crinum giganteum given intraperitoneally at doses of 6.25, 12.5 and 25 mg/kg in rats prolonged the duration of pentobarbital sleeping time and in mice reduced spontaneous motor activity, decreased the exploratory activity and attenuated amphetamine-induced stereotype behavior. The intraperitoneal and oral preliminary LD(50) in mice were found to be 627 and 1468 mg/kg, respectively. The data obtained suggest that the aqueous extract of C. giganteum contains some biologically active principles with sedative activity.