Can You Take Miralax And Fiber At The Same Time?

Answer

Miralax (polyethylene glycol 3350) and fiber can be used together at the same time as there is no interaction between the two. Ideally, fiber and dietary changes are the first line of treatment for constipation but Miralax can certainly be added on if needed. 

Fiber Products

There are a variety of fiber products available over the counter including Citrucel, Metamucil, and Benefiber. All are classified as soluble fiber. These fiber products are useful for bulking up the stool as well as hastening foods through our digestive tract and are typically used as a first-line option for constipation. If you take medication, fiber should be taken at least 2 hours before or 2 hours after other medications are taken by mouth. Also, be sure to drink a good amount of water with your dose and after your dose.

Miralax

Miralax is the brand name for polyethylene glycol 3350. Polyethylene glycol is known as an osmotic laxative. It increases the fluid in the GI tract by binding water and causes this water to be retained in the stool. Polyethylene glycol is not absorbed into your body, it just moves through your GI tract. In terms of side effects, it sometimes can cause diarrhea, increase how often you go to the bathroom, and flatulence. Typically, doses of 17 grams or less don't cause too many problems.

Taking Fiber With Miralax

While both fiber products and Miralax can be taken regularly, fiber is generally considered a first-line option for constipation and can be taken daily as a supplement. Miralax can be taken daily as well, but usually only for chronic constipation. In cases where both Miralax and a fiber product (such as Benefiber) are used, the Miralax is discontinued when constipation symptoms are controlled.

If constipation remains under control with fiber and diet solely, Miralax can be used simply as needed for more severe symptoms as they come up.