Question

Which of the following classes of antibiotics is particularly effective against anaerobes?

		Quinolones (e.g.) nalidixic acid)
		Nitroimidazole (e.g. metronidazole)
		Fluroquinolones ( e.g. ciprofloxacin, norfloxacin)
		Cephalosporins (e.g. cephazolin

Answer 1

​​​​​Nitroimidazole (eg : metronidazole) is very effective against anaerobic bacteria.

because this class of antibiotics causes the cell death of bacteria by means of destruction of protien synthesis for DNA formation of bacteria.(bactericidal action)

quinolones , fluroquinalones and ciprofloxacin are having bacteriostatic activity in their cells. That means bacteria won't die , instead these Medicines make bacteria inactivate and inhibit their replication .

so metronidazoles are effective for anaerobic bacterial infection.