How far should an enema be inserted into an adult's rectum?

An enema should be inserted into an adult's rectum to a depth of 3 to 4 inches. This is considered an appropriate range that allows the enema solution to be effectively delivered into the rectum without causing discomfort or potential injury to the rectal lining. Inserting the enema tube too deeply may lead to complications such as perforation or intense discomfort, which can deter from the therapeutic effectiveness of the procedure.

This depth is sufficient for the solution to reach the sigmoid colon, where it can stimulate evacuation of the bowels. Additionally, proper insertion technique minimizes the risk of complications and enhances patient comfort, making it critical for the enema to be employed effectively.