A series of benztriazoles bearing Mannich bases (2 -10) were synthesized from benztriazole by aminomethylation with formaldehyde and various substituted secondary amines. Titled compounds were synthesized by Mannich reaction and they were characterized by IR and ¹HNMR spectroscopy. All these Mannich bases were screened for hepatoprotective activity on carbon tetrachloride induced liver damage in rats. Only compounds 4 (250 mg/kg) protected significantly the animals from carbon tetrachloride induced hepatotoxicity. Compound 4 N-morpholinyl methyl benztriazole exhibited significant activity comparable to that of standard drug silymarin.