Miralax is used to prevent constipation. Polyethylene glycol works by inserting water into the intestines, helping to keep the digestive system frequently. The stool becomes softer when the intestines retain water. Polyethylene glycol (MiraLAX) usually relieves constipation in 1-3 days. Polyethylene glycol 3350 compound with electrolytes will be effective and suitable for adult constipation with a specific type of intestinal syndrome that stimulates constipation (sometimes called Is IBS-C), digestive disorders that cause pain or discomfort because of changes in frequency or unity of intestinal movement. Instructions for use: Adults and children 17 years and older: Use about (17g) mixed with water, drinks (120ml-240ml) 1 time a day. Children under 16 years old consult a doctor before use. Polyethylene glycol (MiraLAX) comes as a powder, which you can dissolve in liquid and drink. You can combine with Polyethylene glycol (MiraLAX) water, juice, soft drinks, coffee, tea, and cold, hot, or room temperature. The product is not a medicine, so it is not a substitute for medicine.