CrCl >50 mL/min
1.5 g (Ceftolozane 1 g/Tazobactam 0.5 g) IV infused over 1h q8h x7d
1.5 g IV q8h x4-14d + Metronidazole 500 mg IV q8h
3 g (Ceftolozane 2 g/Tazobactam 1 g) IV infused over 1h q8h x8-14d