<unk>  or<unk>  preparation is a medical technique to cleanse<unk>  to prepare colonoscopy or colorectal surgery.<unk>  can be performed either by the oral ingestion of medication or by enema. Polyethylene glycol and citrates are used for<unk> .
Bowel cleansing
Nutrient enema
Selective digestive decontamination
Colostomy reversal
Colostomy
Enterostomy
Enterotomy
Ileostomy