5 Foods To Avoid When Taking Miralax That Worsen Constipation

Miralax is a common over-the-counter laxative that can help treat constipation. 

Miralax is mostly used as a short-term treatment for constipation, but in some cases, doctors have prescribed it to help treat chronic constipation. 

Additionally, Miralax is sometimes prescribed by healthcare professionals to aid in colonoscopy preparation.

The medication works by drawing water from body tissues into the colon, softening the stools, and increasing bowel movements.

While Miralax can effectively relieve constipation, it may be most beneficial when combined with dietary and lifestyle modifications.

Navigating dietary choices while managing digestive issues is crucial but often overlooked. 

In this article, we will review the foods you should avoid and which ones you should prefer when taking Miralax. 

This will help you get the most out of the treatment and promote good bowel movements and digestion. 

5 Foods To Avoid While Taking Miralax

Despite Miralax’s wide usage, many patients are unaware that what they eat can influence the actions of this gentle laxative. 

Here are the foods to avoid or limit that can counteract the benefits of Miralax or worsen constipation. 

1) Processed Foods

Highly processed foods often contain little to no fiber and are packed with preservatives and artificial additives. These can often slow down your digestion and contribute to constipation. 

2) Dairy Products

While dairy can be part of a healthy diet, it can cause constipation in some people.

High-fat dairy products can be binding and are best to avoid when trying to promote regular bowel movements. 

3) High Sugary Foods

A high sugar intake can lead to an imbalance in gut health, which can negatively impact digestion and bowel movements. 

Avoid eating too many sugary foods to help maintain an environment where Miralax is the most effective. 

4) Alcohol

Alcohol won’t directly cause constipation. However, alcohol can increase the frequency of urination, which can lead to dehydration. This can, in turn, increase the risk of constipation. 

5) Carbonated Beverages

Some people may experience digestive discomfort like bloating and gas when mixing Miralax with carbonated beverages. 

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4 Healthy Foods To Eat While On Miralax

Now that we’ve seen the foods we want to avoid while taking Miralax, let’s discuss the foods that can promote good gut health and result in good bowel movements. 

1) High-Fiber Foods

Fiber is nature’s broom for your digestive system. It adds bulk to your stool and can soften it, making it easier to pass. 

Including high-fiber foods like beans, whole grains, legumes, and oats in your diet can improve the results of Miralax. 

2) Fruits And Vegetables

Fresh produce plays a crucial role in the diet when taking Miralax and trying to promote good bowel movements

Blueberries, apples, pears, and leafy greens are great sources of both soluble and insoluble fiber. 

In addition, studies show that its high antioxidant content can help reduce inflammation, resulting in better gut health. 

3) Probiotic-Rich Foods

Probiotics are the “good” bacteria that help maintain a healthy balance in the digestive tract. 

Including sources like kefir, sauerkraut, kombucha, and kimchi can be advantageous while taking Miralax, as they support digestive health. 

4) Healthy Fats

Including healthy fats in your diet, such as nuts, seeds, avocado, and olive oil, can help lubricate the intestines, promoting smoother bowel movements. 

In addition, most are high in omega-3 fatty acids, which studies show have powerful anti-inflammatory properties. 

Reducing inflammation can help promote good gut health, leading to better bowel movements. 

What Should You Not Mix With Miralax?

While Miralax is safe for most people, there are some things you want to avoid mixing this medication with. These options can increase the risk of side effects or lead to serious health problems. 

  • Other laxatives. Mixing several laxatives all at once can lead to diarrhea, dehydration, and electrolyte imbalances. Avoid mixing Miralax with senna or bisacodyl. 
  • Fiber supplements. While you want to increase your fiber intake, increasing it too much can lead to unwanted digestive issues. Make sure you speak with a health professional before adding a fiber supplement to your diet, especially if you are taking Miralax. 
  • Certain medications. Miralax may interact with some medications, especially those that affect gastrointestinal motility or electrolyte balance. Tell your doctor and pharmacist all medications you are taking. 

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How Long Should You Wait To Eat After Taking Miralax?

The timing of eating after taking Miralax varies from person to person. It all depends on individual preferences and responses to the medication. 

It’s usually recommended to take Miralax on an empty stomach. So, it’s advised to wait 30 to 60 minutes before eating solid food. 

However, people who may experience gastric discomfort when taking Miralax may want to take it with food. 

For that reason, it’s best to consult a health professional about the best time to take the medication according to your needs. 

How Soon Do You Have A Bowel Movement After Taking Movicol?

The time it takes to notice any changes in your bowel movements can vary from person to person. But generally speaking, most people see differences in their bathroom breaks one to three days after consistently taking Miralax. 

However, some people may notice results only a couple of hours after taking Miralax. 

What Happens If You Can’t Poop After Taking Laxido?

If you cannot go to the bathroom after taking Miralax for several days, it’s ideal to speak with a health professional. 

They can determine if you need any changes in your diet or water intake or if you have any underlying medication conditions, such as irritable bowel syndrome (IBS) or inflammatory bowel disease (IBD). 

Can You Put Miralax In A Smoothie?

Yes, you can mix Miralax in a smoothie. Since it has no taste, you can add it to your favorite drink. However, this only applies if you are going to drink the smoothie right after mixing it. 

What Are The Side Effects Of Macrogol?

Like any other medication, Miralax may cause mild or serious side effects. Here are some of the most common side effects. 

  • Diarrhea
  • Gas
  • Stomach cramps
  • Bloating
  • Nausea
  • Dehydration 
  • Allergic reactions 

If you experience any previous symptoms, speak with a health professional to determine if you should still be taking the medication. 

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Other Lifestyle Habits To Promote Good Bowel Movements

Besides taking Miralax or modifying your nutrition, there are other lifestyle factors that can help promote good bowel movements. Here are some to keep in mind. 

Stay hydrated

A good water intake is crucial for maintaining bowel regularity. Aim to drink plenty of water throughout the day since dehydration can increase the risk of constipation. 

Regular exercise

Engage in regular physical activity to stimulate bowel movements and promote overall digestive health. 

Establish regular bathroom habits

Try to establish a routine for your bowel movements by going to the bathroom at the same time each day. Consistency can help train your body to have regular bowel movements. 

Manage stress

Chronic stress can affect your digestion and contribute to constipation. Engage in regular stress management techniques like yoga or meditation. 

Avoid holding it in

When you feel the urge to have a bowel movement, don’t delay or ignore it. Holding in stoll can lead to constipation over time. 


  • Taking a strategic approach to your diet when using Miralax can improve its effectiveness. 
  • By consuming the right foods and avoiding those that can interfere with healthy bowel movements, you can work with Miralax to help relieve constipation and promote a happy gut. 
  • Remember, the goal is not only to relieve immediate discomfort but also to establish long-term healthy eating habits that can keep your digestive system running smoothly.

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  2. Simopoulos AP. Omega-3 fatty acids in inflammation and autoimmune diseases. J Am Coll Nutr. 2002 Dec;21(6):495-505. doi: 10.1080/07315724.2002.10719248. PMID: 12480795.
  3. Khan MA, Patel KB, Nooruddin M, Swanson G, Fogg L, Keshavarzian A, Brown M. Polyethylene Glycol-3350 (Miralax®)+1.9-L sports drink (Gatorade®)+2 tablets of bisacodyl results in inferior bowel preparation for colonoscopy compared with Polyethylene Glycol-Ascorbic Acid (MoviPrep®). Turk J Gastroenterol. 2018 Jan;29(1):67-74. doi: 10.5152/tjg.2018.17536. PMID: 29391310; PMCID: PMC6322600.

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