Metronidazole:
500 mg  IV every 6 hours
7.5 mg/kg PO/IV q48h
First Dose: 7.5 mg/kg PO/IV x 1
<7 days old
7.5-15 mg/kg/day PO/IV q12-24h
First Dose: 7.5-15 mg/kg PO/IV x 1
>7 days old
15-30 mg/kg/day PO/IV q12h
First Dose: 7.5-15 mg/kg PO/IV x 1
7.5-15 mg/kg/day PO/IV q12-24h
First Dose: 7.5-15 mg/kg PO/IV x 1
15-30 mg/kg/day PO/IV q12h
First Dose: 7.5-15 mg/kg PO/IV x 1
30 mg/kg/day PO/IV q6h
First Dose: 7.5 mg/kg PO/IV x 1
Max: 4 g/day
Neuro antibiotics
ENT antibiotics
Antibiotics 
GU antibiotics
Bone and joint antibiotics
Pediatric antibiotics
Skin and soft tissue antibiotics
Analgesics and sedatives 