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Miralax Side Effects

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.

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.

Miralax Side Effects Reported to FDA

The following 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.


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.
Flatulence
This is a report of a male patient (weight: NA) from US, suffering from the following 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). The consumer presented with:
  • Flatulence
which developed 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.

Faeces Soft, Abnormal Faeces, Muscle Spasms, Off Label Use
This report suggests a potential Miralax Faeces Soft, Abnormal Faeces, Muscle Spasms, Off Label Use 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. Soon after starting Miralax the patient began experiencing various side effects, including:
  • Faeces Soft
  • Abnormal Faeces
  • Muscle Spasms
  • Off Label Use
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.

Feeling Cold, Chills, Body Temperature Decreased, Off Label Use
This Feeling Cold, Chills, Body Temperature Decreased, Off Label Use 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 commencing Miralax, the patient experienced the following unwanted symptoms/side effects:
  • Feeling Cold
  • Chills
  • Body Temperature Decreased
  • Off Label Use
Although 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.

Local Swelling, Swollen Tongue, Erythema, Pruritus, Fear, Skin Infection
This is a report of a female patient (weight: NA) from US. The patient developed the following symptoms/conditions: constipation and was treated with Miralax (dosage: NA) starting NS. Concurrently used drugs: NA.Soon after that, the consumer experienced the following side effects:
  • Local Swelling
  • Swollen Tongue
  • Erythema
  • Pruritus
  • Fear
  • Skin Infection
This opens a possibility that Miralax treatment could cause the above reactions, including local swelling, and some female subjects may be more susceptible.


Blood Creatinine Increased
A 65-year-old female patient (weight: NA) from US with the following symptoms/conditions: constipation started Miralax treatment (dosage: 3/4 Capful Daily, By Mouth) on 2008. Soon after starting Miralax treatment, the subject experienced various side effects, including:
  • Blood Creatinine Increased
Concurrently used drugs:
  • Multivitamen
  • Vitamen D (1000 U)
  • Calcium Carbonate
This finding indicates that some female patients could be more vulnerable to Miralax.

Abdominal Discomfort
A 74-year-old female patient from US (weight: NA) experienced symptoms, such as: NA and was treated with Miralax(dosage: NA). The treatment was initiated on NS. After that a consumer reported the following side effect(s):
  • Abdominal Discomfort
Concurrently used drugs, which potentially could have contributed to side effect(s) or affected Miralax efficacy: NA.

Product Taste Abnormal
In this report, Miralax was administered for the following condition: NA.A female consumer from US (weight: NA) started Miralax treatment (dosage: 17 G, Qpm) on 2012.Sometime after starting the treatment, the patient complained of the following side effect(s):
  • Product Taste Abnormal
A possible interaction with other drugs could have contributed to this reaction:
  • Levothyroxine Sodium
  • Zocor
Establishing a causal relationship between a specific drug and consumer's side effects is complex, but it is possible that in this report Miralax treatment could be related to the listed above side effect(s).

Product Quality Issue
This is a report of the following Miralax side effect(s):
  • Product Quality Issue
A female patient from US (weight: NA) presented with the following condition: NA and received a treatment with Miralax (dosage: Unk, Qpm) starting: 2012.The following concurrently used drugs could have generated interactions: NA.This report suggests that a Miralax treatment could be associated with the listed above side effect(s).

Off Label Use
This Miralax report was submitted by a male consumer from US (weight: NA). The patient was diagnosed with: constipation and Miralax was administered (dosage: NA) starting: NS. The consumer developed a set of symptoms:
  • Off Label Use
Other drugs used simultaneously: NA.Those unexpected symptoms could be linked to a Miralax treatment, however establishing a potential drug-safety problem requires a more detailed clinical analysis.

Diarrhoea, Dark Circles Under Eyes, Off Label Use
This is a report of a possible correlation between Miralax use and the following symptoms/side effect(s):
  • Diarrhoea
  • Dark Circles Under Eyes
  • Off Label Use
which could contribute to an assessment of Miralax risk profile.A 10-year-old male consumer from US (weight: NA) was suffering from NA and was treated with Miralax (dosage: NA) starting NS.Other concurrent medications: NA.

Gastrointestinal Motility Disorder
A 79-year-old female patient from US (weight: NA) presented with the following symptoms: NA and after a treatment with Miralax (dosage: NA) experienced the following side effect(s):
  • Gastrointestinal Motility Disorder
The treatment was started on NS. Miralax was used in combination with the following drugs: NA.This report could alert potential Miralax consumers.

Off Label Use
In this report, a 16-year-old female patient from US (weight: NA) was affected by a possible Miralax side effect.The patient was diagnosed with NA. After a treatment with Miralax (dosage: NA, start date: NS), the patient experienced the following side effect(s):
  • Off Label Use
The following simultaneously used drugs could have led to this reaction: NA.The findings here stress that side effects should be taken into consideration when evaluating a Miralax treatment.

Diarrhoea, Off Label Use
This is a report of a 73-year-old female patient from US (weight: NA), who used Miralax (dosage: NA) for a treatment of colonoscopy. After starting a treatment on Jan 09, 2014, the patient experienced the following side effect(s):
  • Diarrhoea
  • Off Label Use
The following drugs could possibly have interacted with the Miralax treatment NA.Taken together, these observations suggest that a Miralax treatment could be related to side effect(s), such as Diarrhoea, Off Label Use.

Blood Pressure Increased
This blood pressure increased side effect was reported by a consumer or non-health professional from US. A 66-year-old male patient (weight:NA) experienced the following symptoms/conditions: constipation. The patient was prescribed Miralax (dosage: Unk, Prn), which was started on 201402. Concurrently used drugs:
  • Carvedilol
  • Indapamide
  • Lisinopril
When starting to take Miralax the consumer reported the following symptoms:
  • Blood Pressure Increased
These side effects may potentially be related to Miralax.

Fluid Retention, Weight Increased, Off Label Use
This is a Miralax side effect report of a 55-year-old female patient (weight:NA) from US, suffering from the following symptoms/conditions: colonoscopy,gastrooesophageal reflux disease,epilepsy, who was treated with Miralax (dosage:NA, start time: Feb 09, 2014), combined with:
  • Lansoprazole (30 Mg, Qd)
  • Trileptal (600 Mg, Bid)
  • Keppra (500 Mg, Bid)
  • Naproxen
  • Riboflavin
, and developed a serious reaction and a fluid retention side effect. The patient presented with:
  • Fluid Retention
  • Weight Increased
  • Off Label Use
which developed after the beginning of treatment. This side effect report can indicate a possible existence of increased vulnerability to Miralax treatment in female patients suffering from colonoscopy,gastrooesophageal reflux disease,epilepsy, resulting in fluid retention.

Pain, Frequent Bowel Movements
This report suggests a potential Miralax pain side effect(s) that can have serious consequences. A 76-year-old female patient from US (weight:NA) was diagnosed with the following health condition(s): constipation and used Miralax (dosage: 17 G, Qd) starting 201302. Soon after starting Miralax the patient began experiencing various side effects, including:
  • Pain
  • Frequent Bowel Movements
Drugs used concurrently:NA. Although Miralax demonstrated significant improvements in a number of clinically relevant cases, troublesome symptoms, such as pain, may still occur.

Off Label Use
This off label use problem was reported by a consumer or non-health professional from US. A 6-year-old female patient (weight: NA) was diagnosed with the following medical condition(s): NA.On NS a consumer started treatment with Miralax (dosage: NA). The following drugs/medications were being taken at the same time: NA. When commencing Miralax, the patient experienced the following unwanted symptoms /side effects:
  • Off Label Use
Although all drugs are carefully tested before they are licensed for use, they carry potential side effect risks. Some side effects, such as off label use, may become evident only after a product is in use by the general population.

Off Label Use
This is a Miralax side effect report of a 2-year-old female patient (weight: NA) from US. The patient developed the following symptoms/conditions: NA and was treated with Miralax (dosage: NA) starting NS. Concurrently used drugs: NA. Soon after that, the consumer experienced the following of symptoms:
  • Off Label Use
This opens a possibility that Miralax could cause off label use and that some female patients may be more susceptible.

Product Solubility Abnormal
A 65-year-old female patient (weight: NA) from US with the following symptoms: NA started Miralax treatment (dosage: Unk, Qd) on NS. Soon after starting Miralax treatment, the consumer experienced several side effects, including:
  • Product Solubility Abnormal
. Concurrently used drugs: NA. This finding indicates that some patients can be more vulnerable to developing Miralax side effects, such as product solubility abnormal.

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 (dosage: NA), which was started on NS. Concurrently used drugs: NA..When starting to take Miralax the consumer reported symptoms, such as:
  • Off Label Use
These side effects may potentially be related to Miralax.

Product Taste Abnormal
This is a report of a 19-year-old female patient (weight: NA) from US, suffering from the following 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). The consumer presented with:
  • Product Taste Abnormal
which developed 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.

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. Soon after starting Miralax the patient began experiencing various side effects, including:
  • Off Label Use
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.

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 commencing Miralax, the patient experienced the following unwanted symptoms/side effects:
  • Product Taste Abnormal
Although 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.

Product Taste Abnormal
This is a report of a 69-year-old female patient (weight: NA) from US. The patient developed the following symptoms/conditions: constipation,bowel preparation and was treated with Miralax (dosage: NA) starting 2011. Concurrently used drugs: NA.Soon after that, the consumer experienced the following side effects:
  • Product Taste Abnormal
This opens a possibility that Miralax treatment could cause the above reactions, including product taste abnormal, and some female subjects may be more susceptible.

Off Label Use
A 16-year-old female patient (weight: NA) from US with the following symptoms/conditions: bowel preparation started Miralax treatment (dosage: NA) on NS. Soon after starting Miralax treatment, the subject experienced various side effects, including:
  • Off Label Use
Concurrently used drugs: NA. This finding indicates that some female patients could be more vulnerable to Miralax.

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Top 10 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

Top 10 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

Keep Track of Side Effects

Note Your Observations

It is really important to keep of your 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

    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.


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