Gram positive: most Streptococci, S. pneumoniae, viridans Streptococci

Gram negative: Most Enterobacteriaceae, H. influenzae, M catarrhalis, N. meningitidis, Pasteurella spp.

Anaerobes: Prevotella melaninogenica, Clostridium (not C. difficile), Peptostreptococci

Does not cover: Enterococci, B. fragilis, Pseudomonas and other more resistant gram negatives, ESBL or AmpC producing Enterobacteriaceae, Listeria, and not the agent of choice for staphylococcal infections.