Ethanolic extract of A. baccifera was tested for its antiurolithic activity in male albino rats. Urinary stones were induced by implantation of zinc discs in the urinary bladder. The stones formed were mainly of magnesium ammonium phosphate with traces of calcium oxalate. Ethanolic extract of A. baccifera (2g/kg/day, po) was found to be effective in reducing the formation of stones as also in dissolving the pre-formed ones. There was a significant increase in the urinary excretion of calcium, magnesium and oxalate, four weeks after implantation of zinc discs. Treatment with A. baccifera has significantly reduced calcium and magnesium levels in the prophylactic group while it has reversed the levels of these ions to normal values in the curative group.