Table 1.

Properties of antibiotics used in present study

Antibiotics	Category	Mechanism	Spectrum	Intestinal Absorption
Metronidazole	nitroimidazole	deactivation of critical enzymes	narrow spectrum; anaerobic bacteria	complete (>90%)
Ciprofloxacin	fluoroquinolone	inhibition of topoisomerase II and IV	broad spectrum; gram-positive and negative	well (>70%)
Aztreonam	β-lactam	inhibition of cell wall	narrow spectrum; gram-negative	poorly
Vancomycin	glycopeptide	inhibition of cell wall synthesis	narrow spectrum; gram-positive	poorly
Imipenem	β-lactam	inhibition of bacterial cell wall formation	broad spectrum; gram-positive and negative	poorly
Cephalothin	β-lactam	inhibition of bacterial cell wall formation	broad spectrum; gram-positive and negative	poorly
Neomycin	aminoglycosides	inhibition of protein synthesis in bacteria	broad spectrum; excellent for gram-negative	poorly