Callistemon citrinus (C. citrinus) belongs to family Myrtaceae that has a great medicinal importance. The petroleum ether, ethyl acetate and methanol extracts of the leaves of C. citrinus were subjected to screenings for brine shrimp lethality. The methanol extract exhibited potent cytotoxic activity with LC50 of 1.67�µg/ml, while the petroleum ether and ethyl acetate extract revealed moderate cytotoxicity with the LC50 of 6.25 and 5.51�µg/ml, respectively.
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