Take this medication by mouth usually once daily, or as directed by your doctor or the directions on the product package.

If you are prescribed the individual packets, mix the powder as directed by your doctor or pharmacist. If you are using the bulk bottle, use the provided cap to measure the prescribed dose. Mix the powder with a glass (4-8 ounces/120-240 milliliters) of liquid such as water, juice, soda, coffee, or tea. Before drinking the solution, stir the powder well until it completely dissolves. If you have any questions, ask your pharmacist.

This medication may cause certain liquid thickeners (starch-based products) to not work well, which may increase the risk of choking. If you are using liquid thickeners with this medication, talk to your pharmacist to select a liquid thickener which will not interact with this medication.

It may take 2 to 4 days after you have started this medication to have a bowel movement. Do not increase your dose or take it more often than prescribed. Also, do not use this medication for more than 2 weeks unless directed by your doctor. Tell your doctor if your condition lasts or gets worse. Extended use or overuse may result in dependence on laxatives and chronic constipation. Overuse may cause diarrhea, dehydration, and mineral imbalance (such as low sodium).

If you are using nonprescription polyethylene glycol for self-treatment of occasional constipation and this treatment has not worked after 7 days, talk to your doctor for additional treatment advice.