<prompt> All of the following are ture regarding cephalosporins except -Bactericidal agentsActive against only gram negative bacteriaIIIrd generation are resistant to beta-lactamases from gram negative bacteriaCeftriaxone is administered parenterally  <response>: Ans. is b i.e., Active against olny gram negative bacteria Cephalosporins are active against gram positive as well as gram negative bacteria, and are bactericidal. o Ceftriaxone is a parentral cephalosporin. o Third generation cephalosporins are highly resistant to beta-lactamases from gram negative bacteria. 