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Miralax Side Effects

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Common Miralax Side Effects


The most commonly reported Miralax side effects (click to view or check a box to report):

Off Label Use (484)
Diarrhoea (144)
Overdose (142)
Flatulence (81)
Underdose (72)
Abdominal Distension (70)
Constipation (58)
Nausea (54)
Product Taste Abnormal (51)
Abdominal Pain Upper (51)
Abdominal Pain (49)
Product Quality Issue (47)
Vomiting (47)
Faeces Discoloured (43)
Product Odour Abnormal (41)
Malaise (37)
Pain (33)
Pruritus (32)
Urticaria (31)
Dyspnoea (30)

➢ More



If you or someone in your family has experienced a serious side effect to a health product, you are encouraged to report the experience to your health care professional (e.g. physician, pharmacist). You could also complete a copy of the side effect reporting form or report your side effect to FDA.

Miralax Side Effects Reported to FDA



Miralax Side Effect Report#9999924
Flatulence
This is a report of a male patient (weight: NA) from US, suffering from the following health symptoms/conditions: constipation, who was treated with Miralax (dosage: 17 G, Qd, start time: 201306), combined with: NA. and developed a serious reaction and side effect(s): Flatulence after the beginning of treatment. This case can indicate the possible existence of increased vulnerability to Miralax treatment in male patients, resulting in Flatulence side effect.
Miralax Side Effect Report#9996156
Faeces Soft, Abnormal Faeces, Muscle Spasms, Off Label Use
This report suggests a potential Miralax Faeces Soft side effect(s) that can have serious consequences. A female patient (weight: NA) from US was diagnosed with the following symptoms/conditions: constipation and used Miralax (dosage: 1 Capful Qd) starting 201311. After starting Miralax the patient began experiencing various side effects, including: Faeces Soft, Abnormal Faeces, Muscle Spasms, Off Label UseAdditional drugs used concurrently:
  • Citrucel (calcium Carbonate (+) Cholecalciferol (+) Methylcellulose)
Although Miralax demonstrated significant improvements in a number of clinically relevant cases, troublesome symptoms, such as Faeces Soft, may still occur.
Miralax Side Effect Report#9995622
Feeling Cold, Chills, Body Temperature Decreased, Off Label Use
This Feeling Cold problem was reported by a consumer or non-health professional from US. A 63-year-old male patient (weight: NA) was diagnosed with the following symptoms/conditions: bowel preparation. On
Dec 10, 2013 this consumer started treatment with Miralax (dosage: NA). The following drugs were being taken at the same time: NA. When using Miralax, the patient experienced the following unwanted symptoms/side effects: Feeling Cold, Chills, Body Temperature Decreased, Off Label UseAlthough all drugs are carefully tested before they are licensed for use, they carry side effect risks. Some side effects, such as Feeling Cold, may become evident only after a product is in use by the general population.
Miralax Side Effect Report#9972055
Local Swelling, Swollen Tongue, Erythema, Pruritus, Fear, Pruritus, Skin Infection
This Local Swelling side effect was reported by a consumer or non-health professional from US. A female patient (weight:NA) experienced the following symptoms/conditions: constipation.The patient was prescribed Miralax (drug dosage: NA), which was initiated on NS. Concurrently used drugs: NA..After starting to take Miralax the consumer reported adverse symptoms, such as: Local Swelling, Swollen Tongue, Erythema, Pruritus, Fear, Pruritus, Skin InfectionThese side effects may potentially be related to Miralax.
Miralax Side Effect Report#9959027
Blood Creatinine Increased
This is a report of a 65-year-old female patient (weight: NA) from US, suffering from the following health symptoms/conditions: constipation, who was treated with Miralax (dosage: 3/4 Capful Daily, By Mouth, start time: 2008), combined with:
  • Multivitamen
  • Vitamen D (1000 U)
  • Calcium Carbonate
and developed a serious reaction and side effect(s): Blood Creatinine Increased after the beginning of treatment. This case can indicate the possible existence of increased vulnerability to Miralax treatment in female patients, resulting in Blood Creatinine Increased side effect.
Miralax Side Effect Report#9937611
Abdominal Discomfort
This report suggests a potential Miralax Abdominal Discomfort side effect(s) that can have serious consequences. A 74-year-old female patient (weight: NA) from US was diagnosed with the following symptoms/conditions: NA and used Miralax (dosage: NA) starting NS. After starting Miralax the patient began experiencing various side effects, including: Abdominal DiscomfortAdditional drugs used concurrently: NA. Although Miralax demonstrated significant improvements in a number of clinically relevant cases, troublesome symptoms, such as Abdominal Discomfort, may still occur.
Miralax Side Effect Report#9935532
Product Taste Abnormal
This Product Taste Abnormal problem was reported by a consumer or non-health professional from US. A female patient (weight: NA) was diagnosed with the following symptoms/conditions: NA. On 2012 this consumer started treatment with Miralax (dosage: 17 G, Qpm). The following drugs were being taken at the same time:
  • Levothyroxine Sodium
  • Zocor
When using Miralax, the patient experienced the following unwanted symptoms/side effects: Product Taste AbnormalAlthough all drugs are carefully tested before they are licensed for use, they carry side effect risks. Some side effects, such as Product Taste Abnormal, may become evident only after a product is in use by the general population.
Miralax Side Effect Report#9934982
Product Quality Issue
This Product Quality Issue side effect was reported by a consumer or non-health professional from US. A female patient (weight:NA) experienced the following symptoms/conditions: NA.The patient was prescribed Miralax (drug dosage: Unk, Qpm), which was initiated on 2012. Concurrently used drugs: NA..After starting to take Miralax the consumer reported adverse symptoms, such as: Product Quality IssueThese side effects may potentially be related to Miralax.
Miralax Side Effect Report#9934201
Off Label Use
This is a report of a male patient (weight: NA) from US, suffering from the following health symptoms/conditions: constipation, who was treated with Miralax (dosage: NA, start time: NS), combined with: NA. and developed a serious reaction and side effect(s): Off Label Use after the beginning of treatment. This case can indicate the possible existence of increased vulnerability to Miralax treatment in male patients, resulting in Off Label Use side effect.
Miralax Side Effect Report#9934146
Diarrhoea, Dark Circles Under Eyes, Off Label Use
This report suggests a potential Miralax Diarrhoea side effect(s) that can have serious consequences. A 10-year-old male patient (weight: NA) from US was diagnosed with the following symptoms/conditions: NA and used Miralax (dosage: NA) starting NS. After starting Miralax the patient began experiencing various side effects, including: Diarrhoea, Dark Circles Under Eyes, Off Label UseAdditional drugs used concurrently: NA. Although Miralax demonstrated significant improvements in a number of clinically relevant cases, troublesome symptoms, such as Diarrhoea, may still occur.
Miralax Side Effect Report#9929077
Gastrointestinal Motility Disorder
This Gastrointestinal Motility Disorder problem was reported by a consumer or non-health professional from US. A 79-year-old female patient (weight: NA) was diagnosed with the following symptoms/conditions: NA. On NS this consumer started treatment with Miralax (dosage: NA). The following drugs were being taken at the same time: NA. When using Miralax, the patient experienced the following unwanted symptoms/side effects: Gastrointestinal Motility DisorderAlthough all drugs are carefully tested before they are licensed for use, they carry side effect risks. Some side effects, such as Gastrointestinal Motility Disorder, may become evident only after a product is in use by the general population.
Miralax Side Effect Report#9928733
Off Label Use
This Off Label Use side effect was reported by a consumer or non-health professional from US. A 16-year-old female patient (weight:NA) experienced the following symptoms/conditions: NA.The patient was prescribed Miralax (drug dosage: NA), which was initiated on NS. Concurrently used drugs: NA..After starting to take Miralax the consumer reported adverse symptoms, such as: Off Label UseThese side effects may potentially be related to Miralax.
Miralax Side Effect Report#9920455
Diarrhoea, Off Label Use
This is a report of a 73-year-old female patient (weight: NA) from US, suffering from the following health symptoms/conditions: colonoscopy, who was treated with Miralax (dosage: NA, start time:
Jan 09, 2014), combined with: NA. and developed a serious reaction and side effect(s): Diarrhoea, Off Label Use after the beginning of treatment. This case can indicate the possible existence of increased vulnerability to Miralax treatment in female patients, resulting in Diarrhoea side effect.
Miralax Side Effect Report#9920308
Blood Pressure Increased
This report suggests a potential Miralax Blood Pressure Increased side effect(s) that can have serious consequences. A 66-year-old male patient (weight: NA) from US was diagnosed with the following symptoms/conditions: constipation and used Miralax (dosage: Unk, Prn) starting 201402. After starting Miralax the patient began experiencing various side effects, including: Blood Pressure IncreasedAdditional drugs used concurrently:
  • Carvedilol
  • Indapamide
  • Lisinopril
Although Miralax demonstrated significant improvements in a number of clinically relevant cases, troublesome symptoms, such as Blood Pressure Increased, may still occur.
Miralax Side Effect Report#9919485
Fluid Retention, Weight Increased, Off Label Use
This Fluid Retention problem was reported by a consumer or non-health professional from US. A 55-year-old female patient (weight: NA) was diagnosed with the following symptoms/conditions: colonoscopy,gastrooesophageal reflux disease,epilepsy. On
Feb 09, 2014 this consumer started treatment with Miralax (dosage: NA). The following drugs were being taken at the same time:
  • Lansoprazole (30 Mg, Qd)
  • Trileptal (600 Mg, Bid)
  • Keppra (500 Mg, Bid)
  • Naproxen
  • Riboflavin
When using Miralax, the patient experienced the following unwanted symptoms/side effects: Fluid Retention, Weight Increased, Off Label UseAlthough all drugs are carefully tested before they are licensed for use, they carry side effect risks. Some side effects, such as Fluid Retention, may become evident only after a product is in use by the general population.
Miralax Side Effect Report#9919405
Pain, Frequent Bowel Movements
This Pain side effect was reported by a consumer or non-health professional from US. A 76-year-old female patient (weight:NA) experienced the following symptoms/conditions: constipation.The patient was prescribed Miralax (drug dosage: 17 G, Qd), which was initiated on 201302. Concurrently used drugs: NA..After starting to take Miralax the consumer reported adverse symptoms, such as: Pain, Frequent Bowel MovementsThese side effects may potentially be related to Miralax.
Miralax Side Effect Report#9918068
Off Label Use
This is a report of a 6-year-old female patient (weight: NA) from US, suffering from the following health symptoms/conditions: NA, who was treated with Miralax (dosage: NA, start time: NS), combined with: NA. and developed a serious reaction and side effect(s): Off Label Use after the beginning of treatment. This case can indicate the possible existence of increased vulnerability to Miralax treatment in female patients, resulting in Off Label Use side effect.
Miralax Side Effect Report#9918060
Off Label Use
This report suggests a potential Miralax Off Label Use side effect(s) that can have serious consequences. A 2-year-old female patient (weight: NA) from US was diagnosed with the following symptoms/conditions: NA and used Miralax (dosage: NA) starting NS. After starting Miralax the patient began experiencing various side effects, including: Off Label UseAdditional drugs used concurrently: NA. Although Miralax demonstrated significant improvements in a number of clinically relevant cases, troublesome symptoms, such as Off Label Use, may still occur.
Miralax Side Effect Report#9918009
Product Solubility Abnormal
This Product Solubility Abnormal problem was reported by a consumer or non-health professional from US. A 65-year-old female patient (weight: NA) was diagnosed with the following symptoms/conditions: NA. On NS this consumer started treatment with Miralax (dosage: Unk, Qd). The following drugs were being taken at the same time: NA. When using Miralax, the patient experienced the following unwanted symptoms/side effects: Product Solubility AbnormalAlthough all drugs are carefully tested before they are licensed for use, they carry side effect risks. Some side effects, such as Product Solubility Abnormal, may become evident only after a product is in use by the general population.
Miralax Side Effect Report#9917722
Off Label Use
This Off Label Use side effect was reported by a consumer or non-health professional from US. A 10-year-old female patient (weight:NA) experienced the following symptoms/conditions: NA.The patient was prescribed Miralax (drug dosage: NA), which was initiated on NS. Concurrently used drugs: NA..After starting to take Miralax the consumer reported adverse symptoms, such as: Off Label UseThese side effects may potentially be related to Miralax.
Miralax Side Effect Report#9915041
Product Taste Abnormal
This is a report of a 19-year-old female patient (weight: NA) from US, suffering from the following health symptoms/conditions: constipation, who was treated with Miralax (dosage: 17 G, Qpm, start time: 2012), combined with: NA. and developed a serious reaction and side effect(s): Product Taste Abnormal after the beginning of treatment. This case can indicate the possible existence of increased vulnerability to Miralax treatment in female patients, resulting in Product Taste Abnormal side effect.
Miralax Side Effect Report#9903563
Off Label Use
This report suggests a potential Miralax Off Label Use side effect(s) that can have serious consequences. A 8-year-old male patient (weight: NA) from US was diagnosed with the following symptoms/conditions: NA and used Miralax (dosage: NA) starting NS. After starting Miralax the patient began experiencing various side effects, including: Off Label UseAdditional drugs used concurrently: NA. Although Miralax demonstrated significant improvements in a number of clinically relevant cases, troublesome symptoms, such as Off Label Use, may still occur.
Miralax Side Effect Report#9894377
Product Taste Abnormal
This Product Taste Abnormal problem was reported by a consumer or non-health professional from US. A 61-year-old male patient (weight: NA) was diagnosed with the following symptoms/conditions: NA. On NS this consumer started treatment with Miralax (dosage: 17 G, Qd). The following drugs were being taken at the same time:
  • Guanfacine Hydrochloride
  • Lisinopril
  • Krill Oil (+) Omega-3 Marine Triglycerides
When using Miralax, the patient experienced the following unwanted symptoms/side effects: Product Taste AbnormalAlthough all drugs are carefully tested before they are licensed for use, they carry side effect risks. Some side effects, such as Product Taste Abnormal, may become evident only after a product is in use by the general population.
Miralax Side Effect Report#9893554
Product Taste Abnormal
This Product Taste Abnormal side effect was reported by a consumer or non-health professional from US. A 69-year-old female patient (weight:NA) experienced the following symptoms/conditions: constipation,bowel preparation.The patient was prescribed Miralax (drug dosage: NA), which was initiated on 2011. Concurrently used drugs: NA..After starting to take Miralax the consumer reported adverse symptoms, such as: Product Taste AbnormalThese side effects may potentially be related to Miralax.
Miralax Side Effect Report#9893491
Off Label Use
This is a report of a 16-year-old female patient (weight: NA) from US, suffering from the following health symptoms/conditions: bowel preparation, who was treated with Miralax (dosage: NA, start time: NS), combined with: NA. and developed a serious reaction and side effect(s): Off Label Use after the beginning of treatment. This case can indicate the possible existence of increased vulnerability to Miralax treatment in female patients, resulting in Off Label Use side effect.


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The appearance of Miralax on this list does not mean that FDA has concluded that the drug has the listed risk. It means that FDA has identified a potential safety issue, but it does not mean that FDA has found a causal relationship between the drug and the listed risk.

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What are common Miralax Side Effects for Women?

Women Side EffectsReports
Off Label Use 273
Diarrhoea 98
Overdose 94
Flatulence 62
Abdominal Distension 57
Underdose 48
Abdominal Pain 41
Constipation 41
Product Taste Abnormal 40
Nausea 39

What are common Miralax Side Effects for Men?

Men Side EffectsReports
Off Label Use 181
Overdose 47
Diarrhoea 44
Underdose 24
Flatulence 19
Constipation 16
Nausea 15
Vomiting 14
Abdominal Pain Upper 13
Product Quality Issue 13

Track Your Side Effects

Note Your Observations

It is really important to keep track of your health symptoms, right from the time you start a new medicine. You can do it any way you prefer: in a notebook, in a computer file or using our online tool. You should also note down any other medicines you are taking at the same time, because there could be an interaction between these medicines.

Why Your Notes are Important

Your notes could be helpful in several ways:

  • You can use them to remind you of details that may alert your health care professional(s) to a problem
  • You will have a record to refer to in the future, in case you are ever prescribed the same medicine again

  • Log Form

    You can use the following log form to write down important information, like the date and time you experienced a side effect and your symptoms, how strong the symptoms were, and any other medicines you were using.

    Medicine Name and Dosage:
    Side Effects Scale Date & Time Other Medicine(s) or Treatment(s)
    Scale: 1 = very mild to 10 = very bad

    Side effects reports are analyzed to discover potential health product safety signals. Some important reactions may take an extremely long time to develop or occur infrequently. Continued monitoring of adverse reactions is thus essential to maintain a comprehensive safety and effectiveness profile of health products.

    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 reports list potential signals of serious risks and new safety information that were identified using the FDA Adverse Event Reporting System (FAERS).
    FAERS is a database that contains information on adverse event and medication errors reports submitted to FDA by healthcare professionals (such as physicians, pharmacists, nurses and others), consumers (such as patients, family members, layers and others) and manufacturers.

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    Discuss Miralax Side Effects

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