Metronidazole
Anaerobic gram negative rod.
If cefinase positive, resistant to penicillin and amoxicillin. Need to use metronidazole or beta-lactam/beta-lactamase inhibitor combination (like amoxicillin-clavulanate).
Normal oral/gastrointestinal/vaginal flora.
Oral/dental infections
Other head/neck infections
Aspiration pneumonia
Intra-abdominal abscess
Diabetic foot infection
Bacteremia
Tubo-ovarian abscess/amnionitis