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MiraLAX Warnings and Precautions

Before taking MiraLAX, let your healthcare provider know if you are breastfeeding or pregnant, or have any allergies. Other safety precautions with MiraLAX include warnings against using this medication if you have certain medical problems, such as irritable bowel syndrome, a bowel obstruction, or kidney disease. This medicine may also cause allergic reactions in rare cases.

What Should I Tell My Healthcare Provider?

You should talk with your healthcare provider prior to taking MiraLAX® (polyethylene glycol 3350) if you have:
  • Nausea, vomiting, abdominal pain (stomach pain), and abdominal swelling (distention), which may be signs of a bowel obstruction
  • A history of a bowel obstruction
  • Irritable bowel syndrome (IBS)
  • Kidney disease, such as kidney failure (renal failure)
  • Any allergies, including to foods, dyes, or preservatives.
Also, let your healthcare provider know if you are:
  • Pregnant or thinking of becoming pregnant
  • Breastfeeding.
Make sure to tell your healthcare provider about any other medications you are taking, including prescription and nonprescription medicines, vitamins, and herbal supplements.

Specific Precautions and Warnings With MiraLAX

Some warnings and precautions to be aware of prior to using this laxative include the following:
  • People with a blockage in the intestines (called a bowel obstruction) should not use this medicine. Make sure to see a healthcare provider before using MiraLAX if you have symptoms of a bowel obstruction. Also, tell your healthcare provider if you develop such symptoms while using the laxative. Symptoms may include:
    • Nausea and vomiting
    • Abdominal (stomach) distention or swelling
    • Abdominal (stomach) pain and cramping.
  • Although MiraLAX is not addictive, long-term use or overuse could result in dependence on laxatives to produce a bowel movement or an imbalance of body salts (electrolyte imbalance). Do not take this medication for longer than seven days without first talking to your healthcare provider.
  • People with certain medical problems, such as kidney disease or IBS, should only take MiraLAX under the direction of a healthcare provider. Therefore, talk to your healthcare provider about using this laxative if you have one of these conditions.
  • Rare cases of an allergic reaction have been reported in some people using MiraLAX. If you develop hives or a skin rash while using this laxative, stop using it and talk to a healthcare provider.
  • It may take up to four days for MiraLAX to produce a bowel movement. Do not increase your dose if you do not have a bowel movement right away. Also, contact your healthcare provider if you do not have a bowel movement within four days.
  • Certain lifestyle changes, such as adequate fiber and fluid intake and regular exercise, can help produce more regular bowel movements. Talk to your healthcare provider about other possible ways to avoid constipation.
  • MiraLAX is considered a pregnancy Category C medication. This means that it may not be safe for use during pregnancy, although the full risks are currently unknown. Talk to your healthcare provider about the risks and benefits of using this product when pregnant (see MiraLAX and Pregnancy).
  • It is unknown if MiraLAX passes through breast milk, although it is not thought to do so. However, if you are breastfeeding or plan to start, discuss this with your healthcare provider prior to taking the drug (see MiraLAX and Breastfeeding).

MiraLAX Medication Information

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