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MiraLAX is an over-the-counter osmotic laxative containing polyethylene glycol 3350. It is supplied as an unflavored powder in bottles and single-dose packets. Each labeled dose contains 17 g of polyethylene glycol 3350. MiraLAX temporarily relieves occasional constipation and usually produces a bowel movement within one to three days.
read more about miralax ...Polyethylene glycol 3350 retains water within the intestines through an osmotic effect. The additional water softens stool and helps it pass more easily. Its activity occurs primarily in the digestive tract, with minimal absorption into the bloodstream.
MiraLAX is labeled for adults and children age 17 and older experiencing occasional constipation. Children age 16 and younger require a doctor's advice before use. Patients with kidney disease should use MiraLAX only under medical supervision. Unexplained abdominal pain, nausea, vomiting, or a persistent change in bowel habits requires evaluation before starting treatment.
Adults and children age 17 and older mix 17 g of MiraLAX powder into 4 to 8 fluid ounces of a beverage and drink it once daily. The powder must dissolve completely before drinking. It should not be mixed with starch-based thickeners intended for swallowing difficulties. Current OTC directions limit use to seven days unless a doctor directs otherwise.
MiraLAX can cause loose stools, diarrhea, bloating, nausea, and abdominal cramping. Excessive diarrhea can contribute to dehydration. Rectal bleeding, worsening abdominal symptoms, or a continued need for laxatives beyond one week requires medical evaluation. People with kidney disease need medical supervision, and anyone with a known polyethylene glycol allergy must not use the product.
MiraLAX temporarily relieves occasional constipation by increasing water retention in the intestines.
Current labeling states that a bowel movement usually occurs within one to three days.
Adults and children age 17 and older take 17 g once daily, dissolved in 4 to 8 fluid ounces of a beverage.
Current OTC labeling limits use to seven days unless a doctor recommends a different treatment duration.
DailyMed - MIRALAX (polyethylene glycol 3350) powder, for solution. https://dailymed.nlm.nih.gov/dailymed/drugInfo.cfm?setid=d69ce3d4-7ca4-4fe3-b49e-6655e48d6963. Date Accessed October 14, 2026.
MiraLAX Laxative for Occasional Constipation Relief. MiraLAX. https://www.miralax.com/products/miralax. Date Accessed October 14, 2026.
Polyethylene Glycol. StatPearls. https://www.ncbi.nlm.nih.gov/books/NBK557652/. Date Accessed October 14, 2026.
Polyethylene Glycol 3350. MedlinePlus. https://medlineplus.gov/druginfo/meds/a603032.html. Date Accessed October 14, 2026.
Polyethylene Glycol Powder for Solution. Cleveland Clinic. https://my.clevelandclinic.org/health/drugs/18795-polyethylene-glycol-powder-for-solution. Date Accessed October 14, 2026.