Complete enema in a disposable squeeze bottle; No. 1 doctor recommended laxative brand; One-way safety valve controls flow and prevents reflux; Pre-lubricated Comfortip for ease of insertion; Protective shield prevents contaminationSize:4.5 fl oz Fleet Enema Saline 4.5 oz. Fleet Enema provides fast-acting relief from constipation. It is a saline laxative enema. It works by pulling water from the body into the bowel.