Antibiotic Irrigations for Intra-Abdominal Drains

Irrigate surgical drain with total amount of 5 mg in 10 ml volume twice/day for 7 days or until drain removal if less than 7 days of therapy.

Irrigate surgical drain with total amount of 12 mg in 10 ml volume once daily for 7 days or until drain removal if less than 7 days of therapy.

The placebo group will receive drain irrigation twice/day