Doctors typically recommend polyethylene glycol 3350 to relieve occasional constipation, notes MedlinePlus. Polyethylene glycol 3350 increases the amount of water in the stool, leading to softer bowel movements that pass easier. The medication may take up to two to four days to produce results.
Patients typically take polyethylene glycol 3350 once daily as needed for up to two weeks, according to MedlinePlus. Polyethylene glycol 3350 sometimes causes side effects such as nausea, bloating, cramping and gas. Patients should talk to a doctor about these side effects if they are severe or unrelieved. Patients who experience diarrhea or hives while taking polyethylene glycol 3350 should call their doctors right away.