<prompt> Effective for common gram-negative anaerobesAztreonamDoxycyclineVancomycinTobramycin  <response>: Aztreonam is effective for Gram-negative anaerobes like Bacteroides, Porphyromonas, Prevotella. Reference: Textbook of Microbiology; Anathanarayan and paniker;s; 9th edition; Page no: 269 