Pharmacodynamics. The following microorganisms are sensitive to the preparation: Gram-positive aerobes: Corinebacterium diphteriae, Enterococcus faecalis, Listeria monocytogenes, Streptococcus agalactiae, Streptococcus bovis, Streptococcus pyogenes; Gram-negative aerobes: Helicobacter pylori; anaerobes: Peptostreptococci; Other canadaonpharm.com: Borrelia.