Miralax when to take

MiraLAX

Generic Name: polyethylene glycol 3350 (pol ee ETH il een GLYE kol)
Brand Names: ClearLax, GaviLax, Gialax, GlycoLax, MiraLAX, PEG3350, SunMark ClearLax

Medically reviewed by Sanjai Sinha, MD Last updated on Oct 2, 2019.

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What is MiraLAX?

MiraLAX (polyethylene glycol 3350) is a laxative solution that increases the amount of water in the intestinal tract to stimulate bowel movements.

MiraLAX is used as a laxative to treat occasional constipation or irregular bowel movements.

MiraLAX may also be used for purposes not listed in this medication guide.

Important information about MiraLAX

You should not use MiraLAX if you have a bowel obstruction or intestinal blockage. If you have any of these conditions, you could have dangerous or life-threatening side effects from MiraLAX.

People with eating disorders (such as anorexia or bulimia) should not use MiraLAX without the advice of a doctor.

Before taking MiraLAX, tell your doctor if you are allergic to any drugs, or if you have ulcerative colitis, irritable bowel syndrome, kidney disease, nausea or vomiting with severe stomach pain, or if you have had a sudden change in bowel habits that has lasted 2 weeks or longer.

MiraLAX should produce a bowel movement within 1 to 3 days of using the medication. Polyethylene glycol 3350 normally causes loose or even watery stools.

Do not use MiraLAX more than once per day. Call your doctor if you are still constipated or irregular after using this medication for 7 days in a row.

Before taking this medicine

You should not use MiraLAX if you are allergic to polyethylene glycol, or if you have a bowel obstruction or intestinal blockage. If you have any of these conditions, you could have dangerous or life-threatening side effects from polyethylene glycol 3350.

People with eating disorders (such as anorexia or bulimia) should not use this medication without the advice of a doctor.

To make sure this medicine is safe for you, tell your doctor if you have:

  • nausea, vomiting, or severe stomach pain;

  • ulcerative colitis;

  • irritable bowel syndrome;

  • kidney disease; or

  • if you have had a sudden change in bowel habits that has lasted 2 weeks or longer.

FDA pregnancy category C. It is not known whether MiraLAX will harm an unborn baby. Tell your doctor if you are pregnant or plan to become pregnant while using this medication.

It is not known whether polyethylene glycol 3350 passes into breast milk or if it could harm a nursing baby. Tell your doctor if you are breast-feeding a baby.

How should I take MiraLAX?

Use MiraLAX exactly as directed on the label, or as it has been prescribed by your doctor. Do not use this medicine in larger or smaller amounts or for longer than recommended.

To use MiraLAX powder, measure your dose with the medicine cap on the bottle. This cap should contain dose marks on the inside of it. Pour the powder into 4 to 8 ounces of a cold or hot beverage such as water, juice, soda, coffee, or tea. Stir this mixture and drink it right away. Do not save for later use.

MiraLAX should produce a bowel movement within 1 to 3 days of using the medication. Polyethylene glycol 3350 normally causes loose or even watery stools.

Do not use MiraLAX more than once per day. Call your doctor if you are still constipated or irregular after using this medication for 7 days in a row.

Store at room temperature away from moisture and heat.

MiraLAX dosing information

Usual Adult Dose of MiraLAX for Constipation:

17 g (diluted in 8 fluid ounces water, juice, soda or coffee) orally once a day

Usual Pediatric Dose for Bowel Preparation:

Occasional constipation:
Children greater than 6 months of age: 0.5 to 1.5 g/kg daily (initial dose 0.5 g/kg; titrate to effect)
Maximum dose: 17 g/day
Fecal impaction:
Children greater than 3 years of age: 1 to 1.5 g/kg daily for 3 days
Maximum dose: 100 g daily
Bowel preparation:
Children greater than 2 years of age: 1.5 g/kg/day
Maximum dose: 100 g daily

Usual Pediatric Dose of MiraLAX for Constipation — Acute:

Occasional constipation:
Children greater than 6 months of age: 0.5 to 1.5 g/kg daily (initial dose 0.5 g/kg; titrate to effect)
Maximum dose: 17 g/day
Fecal impaction:
Children greater than 3 years of age: 1 to 1.5 g/kg daily for 3 days
Maximum dose: 100 g daily
Bowel preparation:
Children greater than 2 years of age: 1.5 g/kg/day
Maximum dose: 100 g daily

What happens if I miss a dose?

Take the missed dose as soon as you remember. Skip the missed dose if it is almost time for your next scheduled dose. Do not take extra medicine to make up the missed dose.

What happens if I overdose?

Seek emergency medical attention or call the Poison Help line at 1-800-222-1222.

What should I avoid?

Follow your doctor’s instructions about any restrictions on food, beverages, or activity.

MiraLAX side effects

Get emergency medical help if you have any signs of an allergic reaction to MiraLAX: hives; difficult breathing; swelling of your face, lips, tongue, or throat.

Stop taking this medicine and call your doctor at once if you have:

  • severe or bloody diarrhea;

  • rectal bleeding;

  • blood in your stools; or

  • severe and worsening stomach pain.

Common MiraLAX side effects may include:

  • bloating, gas, upset stomach;

  • dizziness; or

  • increased sweating.

This is not a complete list of side effects and others may occur. Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088.

What other drugs will affect MiraLAX?

Other drugs may interact with MiraLAX, including prescription and over-the-counter medicines, vitamins, and herbal products. Tell each of your health care providers about all medicines you use now and any medicine you start or stop using.

Further information

Remember, keep this and all other medicines out of the reach of children, never share your medicines with others, and use MiraLAX only for the indication prescribed.

Always consult your healthcare provider to ensure the information displayed on this page applies to your personal circumstances.

Copyright 1996-2020 Cerner Multum, Inc. Version: 2.04.

Related questions

  • MiraLax – what is the dosage in teaspoons or tablespoons?

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MiraLAX (polyethylene glycol 3350)

You may wonder how certain products compare to MiraLAX. Below are comparisons between MiraLAX and several other treatments.

MiraLAX vs. Metamucil

MiraLAX and Metamucil are both laxatives, but they work in different ways.

MiraLAX is an osmotic laxative. That means it draws water into the colon, which softens the stool and may naturally stimulate the colon to contract. These actions help ease bowel movements.

Metamucil is a psyllium fiber supplement that works as a bulk-forming laxative. Like osmotic laxatives, Metamucil draws water into the colon and makes the stool softer. But in addition to that, its fiber content bulks up the stool, which naturally stimulates movement of the colon to pass the stool.

Uses

MiraLAX is used for short-term treatment of constipation and long-term treatment of chronic constipation. It’s also used for bowel prep before colonoscopy.

Metamucil is primarily used for preventing constipation. However, it may also be used for short-term treatment of constipation, as well as long-term treatment of chronic constipation. Metamucil is also used to help treat diarrhea, irritable bowel syndrome (IBS), diverticulosis, and high cholesterol.

Drug forms

MiraLAX comes as a powder in bottles and single-serve packets. You mix the powder with four to eight ounces of liquid and drink it once daily.

Metamucil is available as a powder and as a capsule. You mix the powder with 8 ounces of water and drink it one to three times daily. For the capsule, you typically take two to five capsules up to four times daily.

Side effects and risks

MiraLAX and Metamucil have very similar common side effects. These can include:

  • diarrhea or loose stools
  • stomach pain
  • bloating
  • gas (flatulence)
  • nausea

Some people may have more gas or bloating with Metamucil compared to MiraLAX. However, this side effect may decrease or go away with continued use of either product.

Taking Metamucil without adequate liquid can cause choking. Be sure to take Metamucil with at least 8 ounces of liquid. If you have swallowing problems, don’t take Metamucil.

Effectiveness

MiraLAX and Metamucil are both effective for treating constipation, but they have not been compared in clinical studies.

Guidelines from the American College of Gastroenterology and American Society of Colon and Rectal Surgeons recommend increasing dietary fiber or using fiber supplements such as Metamucil as a first-choice option to prevent and treat constipation, including chronic constipation.

They also recommend osmotic laxatives such as MiraLAX for treating constipation, including chronic constipation.

Both MiraLAX and Metamucil usually take one to three days to cause a bowel movement.

MiraLAX vs. Colace

MiraLAX is an osmotic laxative. That means it draws water into the colon, which softens the stool and may naturally stimulate the colon to contract. These actions help ease bowel movements.

Colace is a stool softener. It helps to draw water into the stool itself to make it softer and easier to pass. It doesn’t stimulate a bowel movement, as many laxatives do.

Uses

MiraLAX is used for short-term treatment of constipation and long-term treatment of chronic constipation. It’s also used for bowel prep before colonoscopy.

Colace is used short-term to prevent and to treat constipation. It’s not currently recommended for long-term treatment of chronic constipation. Colace is commonly used after surgical procedures to help prevent constipation.

Drug forms

MiraLAX comes as a powder in bottles and single-serve packets. You mix the powder with four to eight ounces of liquid and drink it once daily.

Colace comes as a capsule you typically take twice daily.

Side effects and risks

Common MiraLAX side effects include:

  • diarrhea or loose stools
  • stomach pain
  • bloating
  • gas (flatulence)
  • nausea

Colace doesn’t commonly cause side effects. In some cases, it causes loose stools. Diarrhea is considered a rare side effect.

Effectiveness

MiraLAX and Colace are both effective for treating constipation. However, their effectiveness hasn’t been compared in clinical studies.

Guidelines from the American College of Gastroenterology and the American Society of Colon and Rectal Surgeons recommend osmotic laxatives, including MiraLAX, for treating constipation, including chronic constipation.

Although Colace is very commonly used to treat constipation, these guidelines don’t recommend it for this use due to a lack of evidence showing benefit.

Both MiraLAX and Colace usually take one to three days to cause a bowel movement.

MiraLAX vs. Dulcolax

MiraLAX is an osmotic laxative. That means it draws water into the colon, which softens the stool and may naturally stimulate the colon to contract. These actions help ease bowel movements.

Dulocolax (bisacodyl) is a stimulant laxative. It works by irritating the intestines and causing them to contract. It also works by increasing water in the intestines. Both of these actions help cause a bowel movement.

Uses

MiraLAX is used for short-term treatment of constipation and long-term treatment of chronic constipation. It’s also used for bowel prep before colonoscopy.

Dulcolax is used for short-term treatment of constipation. It should not be used long-term. Dulcolax may also be used in combination with other laxatives (including MiraLAX) for bowel prep before colonoscopy or other procedures.

Drug forms

MiraLAX comes as a powder in bottles and single-serve packets. You mix the powder with four to eight ounces of liquid and drink it once daily.

Dulcolax comes as tablets and rectal suppositories. Both forms are used once per day.

Side effects and risks

Common side effects from both MiraLAX and Dulcolax include:

  • diarrhea or loose stools
  • bloating
  • gas (flatulence)
  • nausea

The following side effects can occur with both MiraLAX and Dulcolax, but are more common with Dulcolax:

  • stomach pain
  • cramping
  • vomiting
  • diarrhea
  • electrolyte problems such as low potassium

Stimulant laxatives, including Dulcolax, are also more likely to cause laxative dependence when used long-term. This can cause severe constipation when the medication is stopped.

Effectiveness

MiraLAX and Dulcolax are both effective for treating constipation. However, their effectiveness hasn’t been compared in clinical studies.

Guidelines from the American College of Gastroenterology and the American Society of Colon and Rectal Surgeons recommend osmotic laxatives such as MiraLAX for treating constipation, including chronic constipation.

Dulcolax is considered a second-choice option for short-term treatment of constipation. Also, it shouldn’t be used long-term.

Another difference is how long these products take to work. MiraLAX usually takes one to three days to cause a bowel movement. Dulcolax tablets, on the other hand, usually cause a bowel movement within 6 to 12 hours. And Dulcolax suppositories typically do so within 15 minutes to an hour.

MiraLAX vs. milk of magnesia

MiraLAX is an osmotic laxative. That means it draws water into the colon, which softens the stool and may naturally stimulate the colon to contract. These actions help ease bowel movements.

Milk of magnesia (Phillip’s Milk of Magnesia and others) is another name for magnesium hydroxide. It works like an osmotic laxative.

Uses

MiraLAX is used for short-term treatment of constipation and long-term treatment of chronic constipation. It’s also used for bowel prep before colonoscopy.

Milk of magnesia is used for short-term treatment of constipation. It’s not currently recommended for long-term treatment of chronic constipation.

Drug forms

MiraLAX comes as a powder in bottles and single-serve packets. You mix the powder with four to eight ounces of liquid and drink it once daily.

Milk of magnesia is the liquid form of magnesium hydroxide. Milk of magnesia products come as liquid suspensions. They’re usually taken once daily, but may be taken more often if needed.

Magnesium hydroxide products also come as oral tablets or caplets that are typically taken once daily.

Side effects and risks

Common side effects of MiraLAX include:

  • diarrhea or loose stools
  • stomach pain
  • bloating
  • gas (flatulence)
  • nausea

Milk of magnesia and other magnesium hydroxide products can cause the same side effects as MiraLAX, as well as:

  • cramping
  • vomiting
  • chalky taste

If you have kidney problems, you should not use milk of magnesia or other magnesium hydroxide products. These products can cause high magnesium levels in the body, which can cause dangerous side effects such as:

  • muscle weakness
  • low blood pressure
  • confusion
  • heart rhythm changes

Effectiveness

An analysis of studies comparing MiraLAX and milk of magnesia for constipation in children found conflicting results. Some of these studies show that MiraLAX might be slightly more effective than milk of magnesia. However, another study in the analysis found that milk of magnesia may be more effective.

Guidelines for treating constipation in children recommend MiraLAX as a first choice for short- and long-term treatment of constipation. Milk of magnesia is considered a second-choice option.

For adults, guidelines from the American College of Gastroenterology and the American Society of Colon and Rectal Surgeons recommend osmotic laxatives such as MiraLAX for treating constipation, including chronic constipation.

Even though milk of magnesia and other magnesium hydroxide products are very commonly used for treating constipation in adults, these guidelines don’t recommend them for this purpose because there’s not a lot of evidence showing benefit.

Another difference between MiraLAX and milk of magnesia is how long they take to work. MiraLAX usually takes one to three days to cause a bowel movement. Milk of magnesia, on the other hand, usually causes a bowel movement within 30 minutes to 6 hours.

MiraLAX vs. Benefiber

MiraLAX and Benefiber are both laxatives but work in different ways.

MiraLAX is an osmotic laxative. That means it draws water into the colon, which softens the stool and may naturally stimulate the colon to contract. These actions help ease bowel movements.

Benefiber is a wheat dextrin fiber supplement that works as a bulk-forming laxative. Like osmotic laxatives, Benefiber draws water into the colon and makes the stool softer. But in addition to that, its fiber content bulks up the stool, which naturally stimulates movement of the colon to pass the stool.

Uses

MiraLAX is used for short-term treatment of constipation and long-term treatment of chronic constipation. It’s also used for bowel prep before colonoscopy.

Benefiber is primarily used for preventing constipation. However, it may also be used for short-term treatment of constipation, as well as long-term treatment of chronic constipation.

Drug forms

MiraLAX comes as a powder in bottles and single-serve packets. You mix the powder with four to eight ounces of liquid and drink it once daily.

Benefiber comes as a bulk powder and in single-serving packets. The powder is mixed with 4 to 8 ounces of water or another non-carbonated beverage and taken 1 to 3 times daily. It can also be mixed into soft foods such as yogurt, pudding, or applesauce.

Side effects and risks

MiraLAX and Benefiber have very similar common side effects. These can include:

  • diarrhea or loose stools
  • stomach pain
  • bloating
  • gas (flatulence)
  • nausea

People with gluten intolerance may want to avoid using Benefiber. This is because Benefiber contains wheat dextrin. The manufacturer says that it contains less than 20 ppm of gluten.

Effectiveness

MiraLAX and Benefiber are both effective for treating constipation. However, no clinical studies have directly compared their effectiveness.

Guidelines from the American College of Gastroenterology and the American Society of Colon and Rectal Surgeons recommend increasing dietary fiber or using fiber supplements such as Benefiber as a first-choice treatment to prevent and treat constipation, including chronic constipation.

They also recommend osmotic laxatives such as MiraLAX for treating constipation, including chronic constipation.

Both MiraLAX and Benefiber usually take one to three days to cause a bowel movement.

MiraLAX vs. Lactulose

Both MiraLAX and lactulose are osmotic laxatives. They work by drawing water into the colon, which softens the stool and can naturally cause the colon to contract. These actions help ease bowel movements.

MiraLAX is available over-the-counter. Lactulose requires a prescription from your doctor.

Uses

MiraLAX is used for short-term treatment of constipation and long-term treatment of chronic constipation. It’s also used for bowel prep before colonoscopy.

Lactulose is used for short-term treatment of constipation and long-term treatment of chronic constipation. Lactulose is also used for people with severe liver disease who have a condition called hepatic encephalopathy.

Drug forms

MiraLAX comes as a powder in bottles and single-serve packets. You mix the powder with four to eight ounces of liquid and drink it once daily.

Lactulose comes as an oral solution and as a powder that you mix with water and drink. You take either form once daily.

Side effects and risks

MiraLAX and lactulose have very similar common side effects. These can include:

  • diarrhea or loose stools
  • stomach pain
  • bloating
  • gas (flatulence)
  • nausea

These side effects may be more common with lactulose. Lactulose may also be more likely to cause electrolyte imbalances as a result of diarrhea. Decreasing the dosage of lactulose may reduce these side effects.

Effectiveness

MiraLAX and lactulose are both effective for treating constipation. Both usually take one to three days to cause a bowel movement.

Guidelines from the American College of Gastroenterology and the American Society of Colon and Rectal Surgeons recommend osmotic laxatives such as these products for treating constipation, including chronic constipation, in adults.

An analysis of studies in children with constipation found that MiraLAX may be more effective than lactulose for increasing bowel movements.

Guidelines for treating constipation in children recommend MiraLAX as a first-choice option for short- and long-term treatment of constipation. Lactulose is considered a second-choice option.

MiraLAX vs. GoLytely

MiraLAX and GoLytely are both osmotic laxatives. That means they draw water into the colon, which softens the stool and may naturally stimulate the colon to contract. These actions help ease bowel movements.

MiraLAX and GoLytely also contain the same main ingredient, polyethylene glycol. In addition, GoLytely contains the electrolytes potassium and sodium.

MiraLAX is an over-the-counter, brand-name product. GoLytely requires a prescription from your doctor.

Uses

MiraLAX is used for short-term treatment of constipation and long-term treatment of chronic constipation. It’s also used for bowel prep before colonoscopy.

GoLytely is only used for bowel prep before colonoscopy or other procedures.

Drug forms

MiraLAX comes as a powder in bottles and single-serve packets. You mix the powder with four to eight ounces of liquid and drink it once daily when used for constipation. When used for bowel prep, larger doses are taken over a period of two days.

GoLytely comes as a powder in a large 4-liter jug. You need to add water to the jug, and then drink the solution as part of a bowel preparation procedure.

Side effects and risks

MiraLAX and GoLytely share some similar side effects, but GoLytely also has additional effects.

More common side effects

Using MiraLAX and GoLytely for bowel prep before colonoscopy or other procedures can cause similar common side effects, such as:

  • bloating
  • stomach pain
  • nausea
  • thirst

Loose stools and diarrhea are expected to occur with bowel prep procedures.

Serious side effects

Although uncommon, some serious side effects have happened in people using GoLytely bowel preparation, such as:

  • electrolyte imbalances, resulting in seizures or heart arrhythmias
  • fluid retention
  • dehydration
  • kidney problems
  • ischemic colitis (inflammation of the colon)

Other considerations

If you have certain health problems, your doctor may do special tests before prescribing GoLytely. Or, they may recommend other products. These health problems include:

  • heart arrhythmia
  • heart failure
  • seizures
  • kidney problems
  • ulcerative colitis
  • blockage in the intestine

Effectiveness

MiraLAX and GoLytely have been directly compared in clinical studies. In one study, GoLytely was more effective than MiraLAX mixed with Gatorade for bowel cleansing before colonoscopy.

In another study, a combination of MiraLAX in Gatorade plus Dulcolax worked as well as GoLytely for bowel cleansing before colonoscopy.

MiraLAX vs. Citrucel

MiraLAX and Citrucel are both laxatives but work in different ways.

MiraLAX is an osmotic laxative. That means it draws water into the colon, which softens the stool and may naturally stimulate the colon to contract. These actions help ease bowel movements.

Citrucel is a methylcellulose fiber supplement that works as a bulk-forming laxative. Like osmotic laxatives, Citrucel draws water into the colon and makes the stool softer. But in addition to that, its fiber content bulks up the stool, which naturally stimulates movement of the colon to pass the stool.

Uses

MiraLAX is used for short-term treatment of constipation and long-term treatment of chronic constipation. It’s also used for bowel prep before colonoscopy.

Citrucel is primarily used for preventing constipation. However, it may also be used for short-term treatment of constipation, as well as long-term treatment of chronic constipation.

Drug forms

MiraLAX comes as a powder in bottles and single-serve packets. You mix the powder with four to eight ounces of liquid and drink it once daily.

Citrucel is available as a bulk powder and in caplets (coated oval tablets). You mix the powder with eight ounces of liquid and drink it one to three times daily. You take the caplet one to six times daily.

Side effects and risks

MiraLAX and Citrucel have very similar common side effects. These can include:

  • diarrhea or loose stools
  • stomach pain or bloating
  • gas or flatulence
  • nausea

These side effects may decrease or go away with continued use of the products.

Taking Citrucel without adequate liquid can cause choking. Be sure to take Citrucel with at least eight ounces of liquid. If you have swallowing problems, don’t take Citrucel.

Effectiveness

MiraLAX and Citrucel are both effective for constipation. Both products usually take one to three days to cause a bowel movement.

Guidelines from the American College of Gastroenterology and the American Society of Colon and Rectal Surgeons recommend increasing dietary fiber or using fiber supplements such as Citrucel as a first-choice option to prevent and treat constipation, including chronic constipation.

The guidelines also recommend osmotic laxatives such as MiraLAX for treating constipation, including chronic constipation.

MiraLAX vs. PediaLax

MiraLAX is an osmotic laxative. That means it draws water into the colon, which softens the stool and may naturally stimulate the colon to contract. These actions help ease bowel movements.

PediaLax (magnesium hydroxide) reduces acid levels in the stomach. It also works like an osmotic laxative. It draws water into the colon, which softens the stool and can naturally stimulate the colon to contract. These effects help produce a bowel movement. (This comparison addresses only the chewable tablet form of PediaLax.)

Uses

MiraLAX is used for short-term treatment of constipation and long-term treatment of chronic constipation. It’s also used for bowel prep before colonoscopy.

MiraLAX is approved for over-the-counter use in adults and children aged 17 years and older. When recommended or prescribed by a doctor, it may also be used in younger children with ages ranging from under 2 years to 16 years.

PediaLax is used for short-term treatment of constipation. It’s not recommended for long-term treatment of chronic constipation.

PediaLax is approved for over-the-counter use in children ages 2 to 11 years.

Drug forms

MiraLAX comes as a powder in bottles and single-serve packets. You mix the powder with four to eight ounces of liquid and drink it once daily.

PediaLax comes as a chewable tablet that may be taken one to six times daily, depending on the child’s age.

Side effects and risks

Common side effects of MiraLAX include:

  • diarrhea or loose stools
  • stomach pain or bloating
  • gas or flatulence
  • nausea

PediaLax can cause the same side effects as MiraLAX, as well as:

  • cramping
  • vomiting
  • chalky taste

If your child has kidney problems, they should not use PediaLax. This product can cause high magnesium levels in the body, which can cause dangerous side effects such as:

  • muscle weakness
  • low blood pressure
  • confusion
  • heart rhythm changes

Effectiveness

MiraLAX and PediaLax are both effective for treating constipation in children. According to the North American Society of Pediatric Gastroenterology, MiraLAX is a first-choice medication for treating and preventing constipation in children.

Products that contain magnesium hydroxide, such as PediaLax, are recommended as second-choice options.

Another difference between the two products is how long they take to work. MiraLAX usually takes one to three days to cause a bowel movement. PediaLax, on the other hand, usually causes a bowel movement within 30 minutes to 6 hours.

Before giving MiraLAX or PediaLax to your child, talk with your child’s doctor. They may want to evaluate your child to determine the cause of constipation. Depending on the cause, other treatments may be needed.

Medical Editor: John P. Cunha, DO, FACOEP

Last reviewed on RxList 4/10/2019

MiraLAX (polyethylene glycol 3350) is used as a laxative to treat occasional constipation or irregular bowel movements. MiraLAX is available over-the-counter and in generic form. Common side effects of MiraLAX include:

  • nausea,
  • abdominal cramping,
  • bloating,
  • upset stomach,
  • gas,
  • dizziness, or
  • increased sweating.

Tell your doctor if you experience serious side effects of MiraLAX including severe or bloody diarrhea, bleeding from your rectum, blood in your stools, or severe and worsening stomach pain, cramping, or bloating.

The usual dose of MiraLAX is 17 grams (about 1 heaping tablespoon) of powder per day (or as directed by physician) in 4 to 8 ounces of water. Other drugs may interact with MiraLAX. Tell your doctor all prescription and over-the-counter medications and supplements you use. During pregnancy, MiraLAX should be used only when prescribed. It is not known if this drug passes into breast milk. Consult your doctor before breast-feeding.

Our MiraLAX (polyethylene glycol 3350) Side Effects Drug Center provides a comprehensive view of available drug information on the potential side effects when taking this medication.

This is not a complete list of side effects and others may occur. Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088.

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