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Pharmacological Study of Cuscuta campestris Yuncker

The dried ethanol extract of the whole plant of Cuscuta campestris Yuncker was studied for its analgesic, antipyretic, antiinflammatory as well as CNS‐depressant activities. The extract was given orally at doses of 50 and 100 mg/kg. A significant protection against the p‐benzoquinone‐induced writhing response in mice was observed. A marked lowering of the body temperature of both hyperthermic as well as normothermic mice was produced. Therefore, the extract possesses a hypothermic rather than an antipyretic effect. A marked inhibition of the carrageenan‐induced rat hind paw oedema was also obtained. Regarding its CNS action, the extract produced a decrease in the motor activity of mice placed on a rotarod. In the conditioned avoidance reaction test the percentage of failure to avoid electric shock was shown to be increased after administration of the extract without any effect on the escape behaviour of the trained rats. Therefore, the CNS‐depressant activity of the extract seems to be due to a tranquillizing effect. It could be concluded that the extract possesses analgesic, hypothermic, antiinflammatory as well as CNS‐depressant activities.