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Miralax Oral

Generic Name: POLYETHYLENE GLYCOL (PEG) 3350 - ORAL
Pronounced: (paw-lee-ETH-ih-leen GLY-coll)

Miralax Oral Side Effects

Nausea, abdominal cramping, or gas may occur. If any of these effects persist or worsen, tell your doctor or pharmacist promptly.

If your doctor has directed you to use this medication, remember that he or she has judged that the benefit to you is greater than the risk of side effects. Many people using this medication do not have serious side effects.

Inform your doctor immediately if you have excessive number of bowel movements, persistent diarrhea, or rectal bleeding while using this medication.

A very serious allergic reaction to this drug is rare. However, seek immediate medical attention if you notice any symptoms of a serious allergic reaction, including:

  • rash
  • itching/swelling (especially of the face/tongue/throat)
  • severe dizziness
  • trouble breathing


This is not a complete list of possible side effects. If you notice other effects not listed above, contact your doctor or pharmacist.

In the US -

Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088.

In Canada - Call your doctor for medical advice about side effects. You may report side effects to Health Canada at 1-866-234-2345.

Miralax Oral Precautions

Before taking this medication, tell your doctor or pharmacist if you are allergic to polyethylene glycol; or if you have any other allergies. This product may contain inactive ingredients, which can cause allergic reactions or other problems. Talk to your pharmacist for more details.

This medication should not be used if you have certain medical conditions. Before using this medicine, consult your doctor or pharmacist if you have:

  • certain stomach/intestinal problems (bowel obstruction)


Before using this medication, tell your doctor or pharmacist your medical history, especially of:

  • persistent nausea/vomiting/abdominal pain
  • other stomach/intestinal problems (irritable bowel syndrome)
  • kidney disease


Caution is advised when using this drug in the elderly because they may be more sensitive to its side effects, especially diarrhea.

During pregnancy, this medication should be used only when clearly needed. Discuss the risks and benefits with your doctor.

It is not known whether this drug passes into breast milk. Consult your doctor before breast-feeding.

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