Polyethylene Glycol 3350. Laxative. Relieves occasional constipation. Softens stool. Original prescription strength. Compare to MiraLax active ingredient (Major PEG3350 is not manufactured or distributed by Schering-Plough HealthCare Products, Inc., distributor of MiraLax). 14 once-daily doses. Major PEG3350 increases frequency of bowel movements and softens the stool. Dissolves in any beverage. Gluten free.