Background
The study aimed to assess the effect of oral prophylactic antibiotics (OAB) with mechanical bowel preparation (MBP) on the serial measurement of postoperative inflammatory markers and clinical outcomes of the patients undergoing laparoscopic colorectal cancer resection surgery.

Methods
A retrospective and prospective data collection was carried out from January 2019 to March 2020 for the patients undergoing laparoscopic colorectal cancer resection. Daily measurements of inflammatory markers were obtained up to 7 days following surgery. The measurements of inflammatory markers were compared between patients who received a 1 week course of OAB along with MBP to those who only received MBP.

Results
There were a total of 110 patients that were divided into 2 groups: patients who received OAB and MBP (n = 44, 40%) and those who had MBP only (n = 66, 60%). There was no significant difference between the patient characteristics and preoperative staging of the cancer between the 2 groups. The overall length of stay was significantly lower in the patients who received OAB (9.09 days [SD 7.94] vs. 6.63 days [SD 4.96], P 0.02). The patients with OAB and MAP had persistently and significantly low levels of white blood cell count, CRP, and neutrophil count throughout the postoperative period as compared to those who only had MBP.

Conclusion
The study demonstrated reduction in serial measurement of inflammatory markers throughout postoperative stay for the patients receiving preoperative OAB. The use of OAB helps in physiological recovery of the patient by reducing the inflammatory process postoperatively.