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Dizziness (39)
Potassium (27)
Am Experiencing Hair Loss (22)
Back Pain (20)
Smelly Gas (14)
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Miralax Side Effects and Adverse Effects reported to US Food and Drug Administration (FDA)

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  Showing 176-200 of 424 

Rectal Haemorrhage (6782494-X)
on Jun 03, 2010 Female from UNITED STATES , 86 years of age, was diagnosed with
  • constipation
and was treated with Miralax. Directly after, patient experienced the unwanted or unexpected Miralax side effects: rectal haemorrhage. Miralax dosage: Po.
Associated medications used:
  • Warfarin Sodium
  • Pantoprazole Sodium
  • Lexapro
  • Synthroid


Faeces Discoloured (6782471-9)
Patient was taking Miralax. Patient felt the following Miralax side effects: faeces discoloured on Jun 10, 2010 from UNITED STATES Additional patient health information: Female , 74 years of age, . Miralax dosage: 17 Gm;qd;po.
Multiple prescriptions taken:
  • Amitiza
  • Ativan
  • Norvasc
  • Micardis


Blood Pressure Systolic Increased, Dizziness, Hyponatraemia (6761807-9)
Adverse event was reported on May 26, 2010 by a Female taking Miralax (Dosage: Po) was diagnosed with
  • colonoscopy
  • hypertension
and. Location: UNITED STATES , 55 years of age, After Miralax was administered, patient encountered several Miralax side effects: blood pressure systolic increased, dizziness, hyponatraemia.
Multiple concurrent drugs taken:
  • Coreg Cr (40 Mg;qd;po)
  • Dulcolax
  • Celexa
  • Irbesartan
  • Aspirin
  • Magnesium Citrate
Patient was hospitalized.

Convulsion (6761805-5)
on May 28, 2010 Male from UNITED STATES , child 10 years of age, was treated with Miralax. Directly after, patient experienced the unwanted or unexpected Miralax side effects: convulsion. Miralax dosage: Po.


Dehydration, Vomiting Projectile (6761803-1)
on Jun 01, 2010 Female from UNITED STATES , 59 years of age, was treated with Miralax. Patient felt the following Miralax side effects: dehydration, vomiting projectile. Miralax dosage: Once;po.
Multiple prescriptions taken:
  • Plavix
  • Milk Of Magnesia Tab (Po)
Patient was hospitalized.

Contusion, Convulsion (6736360-6)
Patient was taking Miralax. After Miralax was administered, patient encountered several Miralax side effects: contusion, convulsion on May 20, 2010 from UNITED STATES Additional patient health information: Male , weighting 21.00 lb, was diagnosed with
  • constipation
and. Miralax dosage: N/A.

Grand Mal Convulsion, Respiratory Arrest, Therapeutic Agent Toxicity (6720634-9)
Adverse event was reported on May 04, 2010 by a Female taking Miralax (Dosage: Po) . Location: UNITED STATES , child 5 years of age, Directly after, patient experienced the unwanted or unexpected Miralax side effects: grand mal convulsion, respiratory arrest, therapeutic agent toxicity.

Rectal Haemorrhage (6693077-4)
on Apr 12, 2010 Female from UNITED STATES , 86 years of age, was diagnosed with
  • constipation
and was treated with Miralax. Patient felt the following Miralax side effects: rectal haemorrhage. Miralax dosage: Po.
Multiple prescriptions taken:
  • Pantoprazole Sodium
  • Lexapro
  • Warfarin Sodium
  • Synthroid


Abnormal Behaviour, Anaphylactic Reaction, Bronchospasm, Convulsion, Dental Caries, Disturbance In Attention, Dry Skin, Emotional Disorder (6681659-5)
on Apr 13, 2010 Male from UNITED STATES , child 4 years of age, weighting 34.00 lb, was diagnosed with
  • constipation
  • rectal prolapse
and was treated with Miralax. After Miralax was administered, patient encountered several Miralax side effects: abnormal behaviour, anaphylactic reaction, bronchospasm, convulsion, dental caries, disturbance in attention, dry skin, emotional disorder. Miralax dosage: 17 G 1 Time Day Po; 17g 2 Time Day Po.

Abdominal Distension, Faeces Discoloured, Muscle Spasms, Unevaluable Event (6665590-7)
Patient was taking Miralax. Directly after, patient experienced the unwanted or unexpected Miralax side effects: abdominal distension, faeces discoloured, muscle spasms, unevaluable event on Mar 10, 2010 from UNITED STATES Additional patient health information: Patient , 90 years of age, . Miralax dosage: Qd; Po.

Asthenia, Barrett's Oesophagus, Cholelithiasis, Dyschezia, Hepatic Function Abnormal, Influenza Like Illness, Lung Neoplasm, Myocardial Infarction (6618955-3)
Adverse event was reported on Feb 18, 2010 by a Female taking Miralax (Dosage: Qd; Po) was diagnosed with
  • constipation
and. Location: UNITED STATES , 56 years of age, Patient felt the following Miralax side effects: asthenia, barrett's oesophagus, cholelithiasis, dyschezia, hepatic function abnormal, influenza like illness, lung neoplasm, myocardial infarction.
Multiple prescriptions taken:
  • Oxycontin
  • Lisinopril


Abnormal Dreams, Asthenia, Autoimmune Thyroiditis, Dreamy State, Emotional Disorder, Feeling Abnormal, Hashimoto's Encephalopathy, Heart Rate Decreased, Hemiparesis (6613143-9)
on Feb 10, 2010 Female from UNITED STATES , 57 years of age, weighting 195.0 lb, was diagnosed with
  • constipation
and was treated with Miralax. After Miralax was administered, patient encountered several Miralax side effects: abnormal dreams, asthenia, autoimmune thyroiditis, dreamy state, emotional disorder, feeling abnormal, hashimoto's encephalopathy, heart rate decreased, hemiparesis. Miralax dosage: 17 Gm; Qd; Po.

Abdominal Pain, Anaemia, Anxiety, Asthenia, Bone Scan Abnormal, Confusional State, Constipation, Escherichia Urinary Tract Infection, Gait Disturbance (6589649-8)
on Feb 01, 2010 Female from UNITED STATES , 76 years of age, was treated with Miralax. Directly after, patient experienced the unwanted or unexpected Miralax side effects: abdominal pain, anaemia, anxiety, asthenia, bone scan abnormal, confusional state, constipation, escherichia urinary tract infection, gait disturbance. Miralax dosage: Po.
Associated medications used:
  • Dasatinib (70 Mg; Qd; Po, 100 Mg; Qd; Po)
  • Dasatinib (70 Mg; Qd; Po, 100 Mg; Qd; Po)
  • Oxycodone
  • Alprazolam
  • Effexor
  • Synthroid
  • Ambien
  • Protonix
Patient was hospitalized.

Diarrhoea, Faeces Discoloured (6553039-4)
Patient was taking Miralax. Patient felt the following Miralax side effects: diarrhoea, faeces discoloured on Jan 15, 2010 from UNITED STATES Additional patient health information: Female , 89 years of age, . Miralax dosage: 8.5 Gm; Po; 17 Gm; Po.

Back Pain, Faeces Discoloured, Muscle Spasms (6536842-6)
Adverse event was reported on Jan 05, 2010 by a Female taking Miralax (Dosage: 17 Gm; Once; Po) was diagnosed with
  • constipation
and. Location: UNITED STATES , 80 years of age, After Miralax was administered, patient encountered several Miralax side effects: back pain, faeces discoloured, muscle spasms.

Abdominal Pain Upper, Back Pain, Cerebrovascular Accident, Dizziness, Muscle Spasms, Muscular Weakness, Nausea, Vomiting (6521145-6)
on Dec 14, 2009 Female from UNITED STATES , 77 years of age, was diagnosed with
  • constipation
and was treated with Miralax. Directly after, patient experienced the unwanted or unexpected Miralax side effects: abdominal pain upper, back pain, cerebrovascular accident, dizziness, muscle spasms, muscular weakness, nausea, vomiting. Miralax dosage: Tid;po.
Associated medications used:
  • Opiates
  • Tylenol (caplet)


Dysgeusia, Nausea, Overgrowth Bacterial (6496697-5)
on Dec 07, 2009 Female from UNITED STATES , 62 years of age, was diagnosed with
  • sjogren's syndrome
and was treated with Miralax. Patient felt the following Miralax side effects: dysgeusia, nausea, overgrowth bacterial. Miralax dosage: Po.

Cough, Dysphonia, Ocular Hyperaemia, Pharyngeal Oedema, Rash, Sneezing, Swollen Tongue, Urticaria (6493282-6)
Patient was taking Miralax. After Miralax was administered, patient encountered several Miralax side effects: cough, dysphonia, ocular hyperaemia, pharyngeal oedema, rash, sneezing, swollen tongue, urticaria on Dec 03, 2009 from UNITED STATES Additional patient health information: Female , 38 years of age, was diagnosed with
  • colonoscopy
and. Miralax dosage: Po.
Multiple concurrent drugs taken:
  • Zoloft
  • Advil
  • Excedrin (migraine)
  • Migraine
  • Indocine


Blood Glucose Increased, Dyspnoea, Flatulence, Loss Of Consciousness (6491783-8)
Adverse event was reported on Dec 02, 2009 by a Female taking Miralax (Dosage: 17 Gm;bid;po) was diagnosed with
  • constipation
and. Location: UNITED STATES , 74 years of age, weighting 115.0 lb, Directly after, patient experienced the unwanted or unexpected Miralax side effects: blood glucose increased, dyspnoea, flatulence, loss of consciousness. Patient was hospitalized.

Diarrhoea, Infrequent Bowel Movements (6468219-6)
on Nov 18, 2009 Male from UNITED STATES , 95 years of age, was treated with Miralax. Patient felt the following Miralax side effects: diarrhoea, infrequent bowel movements. Miralax dosage: 8.5 Gm; Qd; Po, 17 Gm; Qd; Po. Patient was hospitalized.

Bacterial Infection, Dysgeusia, Nausea, Tongue Disorder (6442846-4)
on Nov 06, 2009 Female from UNITED STATES , 62 years of age, was diagnosed with
  • sjogren's syndrome
and was treated with Miralax. After Miralax was administered, patient encountered several Miralax side effects: bacterial infection, dysgeusia, nausea, tongue disorder. Miralax dosage: Po.

Heart Rate Decreased, Presyncope (6442392-8)
Patient was taking Miralax. Directly after, patient experienced the unwanted or unexpected Miralax side effects: heart rate decreased, presyncope on Nov 03, 2009 from UNITED STATES Additional patient health information: Male , 88 years of age, . Miralax dosage: 17 Gm;po.
Associated medications used:
  • Blood Pressure Con.


Anuria (6429345-0)
Adverse event was reported on Oct 26, 2009 by a Female taking Miralax (Dosage: Tid; Po) . Location: UNITED STATES , child 1. years of age, Patient felt the following Miralax side effects: anuria.

Faecaloma (6425843-4)
on Oct 23, 2009 Female from UNITED STATES , 80 years of age, was treated with Miralax. After Miralax was administered, patient encountered several Miralax side effects: faecaloma. Miralax dosage: 34 Gm; Qd; Po, 34 Gm; Bid; Po. Patient was hospitalized.

Flatulence, Inflammation, Oedema Peripheral, Pyrexia (6412008-5)
on Oct 14, 2009 Female from UNITED STATES , 79 years of age, weighting 150.0 lb, was diagnosed with
  • constipation
and was treated with Miralax. Directly after, patient experienced the unwanted or unexpected Miralax side effects: flatulence, inflammation, oedema peripheral, pyrexia. Miralax dosage: Po. Patient was hospitalized.

  Showing 176-200 of 424 

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Record and Track Your Side Effects

It is very important to keep track of all side effects and discuss them with your doctor. If you think you may have a medical emergency, call your doctor or 911 immediately.

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Most drugs have a large list of nonsevere or mild adverse effects which do not rule out continued usage. These effects depend on individual sensitivity, and can include nausea, dizziness, diarrhea, malaise, vomiting, headache, dermatitis, dry mouth, etc. Check commonly reported side effects . These can be considered a form of pseudo-allergic reaction, as not all users experience these effects; many users experience none at all.

You are encouraged to report negative side effects of prescription drugs to the FDA. Visit the FDA MedWatch website or call 1-800-FDA-1088.

Miralax Information

Alternative MIRALAX Names:POLYETHYL

Active Ingredient: POLYETHYL

More About Miralax

Side Effects reported to FDA: 424. View Miralax Adverse Reports

Miralax safety alerts: No

Reported deaths: 17

Reported hospitalizations: 97

Managing Your Medicines

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Before Taking Miralax

Find Out How to Take Miralax

Did You Have a Miralax Side Effect?

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How Effective is Miralax for You?

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