Newly prepared N-(4-alkylphenyl)salicylamides, 3-(4-alkylphenyl)-2H-1,3-benzoxazine-2,4(3H)-diones and adequate 3-(4-alkylphenyl)-4-thioxo-2H-1,3-benzoxazine-2(3H)-ones and 3-(4-alkylphenyl)-2H-1,3-benzoxazine-2,4(3H)-dithiones were evaluated for their antimycobacterial activity