Phosphate salts cannot be drunk all at once, and in clinical practice, it is generally divided into two drinks. There is a certain interval between the two drinks, and it should be diluted with warm water before drinking each time, and it is appropriate to drink more water after drinking.

Sodium and potassium salts in the gastrointestinal tract cannot be drunk all at once, as drinking too much at once may stimulate the gastrointestinal tract of the patient and cause harm. Drinking in two sittings helps the patient to excrete enough amount to clear the intestines. Moreover, drinking all at once can lead to a decrease in the number of defecations, thereby reducing the effect of cleaning the intestines. If it cannot be cleared clean, it is not conducive to later operations and treatments.

The intestinal cleaning before endoscopy or surgery is a hypertonic bowel cleaner. Through the osmotic effect of the drug, a large amount of water can enter the human intestines, promote the excretion of the human intestines, and thus complete the emptying of the intestines. At the same time, phosphate salts can effectively stimulate the reflex of the local nervous system of the intestinal mucosal layer, thus achieving continuous peristalsis of the intestinal wall, enhancing the intestinal motility, and promoting defecation.

However, if kidney disease occurs, limiting the diet of sodium salt should be done under the guidance of a doctor. Patients who are pregnant or still breastfeeding should use it cautiously. Phosphate salts should not be taken when suffering from congenital megacolon, renal failure, congestive heart disease, ascites, intestinal obstruction, and other diseases, and they should not be taken simultaneously with other laxatives.