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What Is Polyethylene Glycol 3350?

Polyethylene glycol 3350, also called PEG 3350, is an osmotic laxative used to relieve occasional constipation. It is available in over-the-counter powder products, including MiraLAX and generic equivalents. PEG 3350 helps retain water in stool, making bowel movements softer and easier to pass. It is generally taken once daily for short-term constipation relief and commonly produces a bowel movement within one to three days. PEG 3350 is also an ingredient in certain prescription bowel preparation products, but those formulations contain additional ingredients and have different dosing instructions.

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What Is Polyethylene Glycol 3350?

Polyethylene glycol 3350, also called PEG 3350, is an osmotic laxative used to relieve occasional constipation. It is available in over-the-counter powder products, including MiraLAX and generic equivalents. PEG 3350 helps retain water in stool, making bowel movements softer and easier to pass. It is generally taken once daily for short-term constipation relief and commonly produces a bowel movement within one to three days. PEG 3350 is also an ingredient in certain prescription bowel preparation products, but those formulations contain additional ingredients and have different dosing instructions.

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How Does Polyethylene Glycol 3350 Work?

Polyethylene glycol 3350 is a large, water-soluble polymer that remains primarily within the digestive tract after oral administration. It holds water in the intestinal contents through an osmotic effect, increasing stool hydration and making bowel movements easier. PEG 3350 has minimal systemic absorption and does not directly stimulate intestinal nerves in the same way as stimulant laxatives. Its effects develop gradually, generally within one to three days. It relieves constipation symptoms but does not correct every underlying cause of irregular bowel habits.

What Conditions Does Polyethylene Glycol 3350 Treat?

Over-the-counter polyethylene glycol 3350 is indicated for occasional constipation and irregular bowel movements. It can help soften hard stools and improve bowel movement frequency. Clinicians may also recommend PEG 3350 for certain chronic constipation conditions under medical supervision. Prescription bowel preparation products containing PEG 3350 and electrolytes are used to cleanse the colon before procedures such as colonoscopy. These preparations should not be confused with ordinary OTC PEG 3350 powder. Persistent constipation, rectal bleeding, unexplained abdominal pain, or major changes in bowel habits require medical evaluation.

How Should Polyethylene Glycol 3350 Be Taken?

For common over-the-counter PEG 3350 powder products, adults and children aged 17 years and older take 17 grams once daily, dissolved completely in four to eight ounces of a beverage. The powder should be measured using the product's marked cap or premeasured packet. It should not be mixed with starch-based thickeners used for swallowing difficulties. OTC treatment should not continue for more than seven days unless directed by a healthcare professional. Children aged 16 years and younger should use it only under medical advice. Prescription bowel preparation products have separate dosing and hydration instructions.

What Are the Side Effects and Warnings of Polyethylene Glycol 3350?

Possible side effects include bloating, gas, abdominal cramping, nausea, and loose stools. Excessive use can cause diarrhea and contribute to dehydration or fluid and electrolyte disturbances. Patients with kidney disease should consult a healthcare professional before using OTC PEG 3350. Individuals with unexplained abdominal pain, nausea, vomiting, or possible bowel obstruction require evaluation before laxative use. Stop treatment and seek advice if rectal bleeding or persistent diarrhea occurs. Patients should follow the labeled duration and should not increase doses to obtain faster results.

Common Questions About Polyethylene Glycol 3350

Is polyethylene glycol 3350 the same as MiraLAX?

Yes. MiraLAX is a brand name for an over-the-counter osmotic laxative containing polyethylene glycol 3350.

How long does polyethylene glycol 3350 take to work?

PEG 3350 generally produces a bowel movement within one to three days. It is not intended to cause immediate bowel evacuation.

Can polyethylene glycol 3350 be taken every day?

OTC PEG 3350 can be taken once daily for up to seven days. Longer treatment should be directed by a healthcare professional.

Is polyethylene glycol 3350 safe for children?

OTC labeling instructs caregivers to consult a doctor before giving PEG 3350 to children aged 16 years or younger. Pediatric dosing should follow medical guidance.

References

DailyMed - MIRALAX (polyethylene glycol 3350) powder, for solution. https://www.dailymed.nlm.nih.gov/dailymed/drugInfo.cfm?setid=d69ce3d4-7ca4-4fe3-b49e-6655e48d6963. Date Accessed November 2, 2026.

Polyethylene Glycol. StatPearls. https://www.ncbi.nlm.nih.gov/books/NBK557652/. Date Accessed November 2, 2026.

Polyethylene Glycol 3350. MedlinePlus. https://medlineplus.gov/druginfo/meds/a603032.html. Date Accessed November 2, 2026.

Polyethylene Glycol 3350. PubChem. https://pubchem.ncbi.nlm.nih.gov/compound/Polyethylene-Glycol-3350. Date Accessed November 2, 2026.

Polyethylene Glycol Powder for Solution. Cleveland Clinic. https://my.clevelandclinic.org/health/drugs/18795-polyethylene-glycol-powder-for-solution. Date Accessed November 2, 2026.