<prompt> All of the following drugs are bactericidal exceptIsoniazidTigecyclineDaptomycinCiprofloxacin  <response>: Tigecycline is a newer drug in the class Glycylcyclines. Its mechanism of action and most propeies are similar to tetracyclines. However, it is resistant to efflux pump major mechanism of resistance against tetracyclines. Most protein synthesis inhibiting drugs including tetracyclines and tigecycline are bacteriostatic except aminoglycosides. Isoniazid, ciprofloxacin and daptomycin are bactericidal. 