What Is MiraLAX?

If you have occasional constipation, you may be considering taking MiraLAX^® (polyethylene glycol 3350). But what is MiraLAX and how does it work?

MiraLAX is a nonprescription, or over-the-counter (OTC), medication used to treat occasional constipation. As a type of osmotic laxative, it works by drawing water into the colon, making the stool soft, and increasing the number of bowel movements. The product will usually cause a bowel movement in one to three days.

Although most people tolerate this laxative well, MiraLAX can cause side effects. Some of the most common problems include nausea, diarrhea, and gas. In most cases, however, reactions to this medication are mild and easy to treat.

MiraLAX comes in the form of a powder, which is dissolved in a beverage (such as water, juice, or tea) and swallowed once a day. Do not use take this laxative for more than seven days without your healthcare provider's approval.

(For more information on what this product is and how it works, click MiraLAX. This article also discusses some safety precautions to be aware of before taking this laxative and why it may not be suitable for some people.)

List of references (click here)

Written by/reviewed by: Susan Lakey, PharmD, MPH

Last reviewed by: Kristi Monson, PharmD