Reported Reactions

Drugs › Osmotic laxative

Brand name · Magnesium hydroxide

Dulcolax: adverse event reports filed with FDA

2,893 reports list it as a suspect or interacting product, 2004–2026. Class: Osmotic laxative. Also reported as Dulcolax /00064401/, Dulcolax Tablets, Dulcolax Nos.

2,893
reports as suspect product
0% of all reports · about 129 a year
137
reports, 12 months to June 2026
86 in the 12 months before
63.8%
marked serious by the reporter
54.5% across the class
9.6%
record death among outcomes, as reported
278 reports · not verified by FDA

Between January 2004 and June 2026, 2,893 adverse event reports received by FDA list the brand name Dulcolax (magnesium hydroxide) as a suspect or interacting product. Reports that mention it only as a concomitant medication (8,741) are left out of every figure here.

In the 12 months to June 2026, 137 reports listed it, up 59% from 86 in the 12 months before. FDA releases FAERS data quarterly, so the newest months are incomplete and grow in later releases. Over its reporting history that is about 129 reports a year and 0% of the 20,646,523 reports in the database, and 2.2% of the reports for the osmotic laxative class. How many people take it is not in the data, so a count is not a rate of occurrence.

Reporters most often recorded constipation (26.9%), drug ineffective (22.8%) and pain (16.6%). A report can list several reactions, so shares add to more than 100%; 532 different terms appear across these reports. Constipation is recorded in 26.9% of these reports, a larger share than in the median osmotic laxative drug (2%).

63.8% of the reports are marked serious by the reporter (54.5% across the class); 9.6% record death among the outcomes and 37% record hospitalisation, as reported. 62.4% of the reports came from consumers, and the largest patient age group is 75 and over (29.5%). FDA states that "a causal relationship cannot be established between product and reactions listed in a report" and that for any given report "there is no certainty that a suspected drug caused the event."

Reports by month, five years

076152Jul 2021: 32Aug 2021: 29Sep 2021: 34Oct 2021: 39Nov 2021: 24Dec 2021: 312022Jan 2022: 31Feb 2022: 26Mar 2022: 37Apr 2022: 25May 2022: 6Jun 2022: 13Jul 2022: 15Aug 2022: 19Sep 2022: 13Oct 2022: 10Nov 2022: 14Dec 2022: 142023Jan 2023: 16Feb 2023: 12Mar 2023: 10Apr 2023: 13May 2023: 15Jun 2023: 17Jul 2023: 23Aug 2023: 108Sep 2023: 121Oct 2023: 66Nov 2023: 152Dec 2023: 622024Jan 2024: 71Feb 2024: 14Mar 2024: 10Apr 2024: 7May 2024: 13Jun 2024: 3Jul 2024: 4Aug 2024: 10Sep 2024: 11Oct 2024: 5Nov 2024: 5Dec 2024: 102025Jan 2025: 5Feb 2025: 2Mar 2025: 9Apr 2025: 5May 2025: 6Jun 2025: 14Jul 2025: 17Aug 2025: 3Sep 2025: 11Oct 2025: 12Nov 2025: 13Dec 2025: 102026Jan 2026: 7Feb 2026: 17Mar 2026: 15Apr 2026: 7May 2026: 10Jun 2026: 15

Reports by the month FDA received them. FDA releases FAERS data quarterly, so the newest months are incomplete and grow in later releases.

By year received

03086152004: 1120042005: 312006: 62007: 620072008: 432009: 842010: 7620102011: 442012: 602013: 7820132014: 932015: 822016: 9420162017: 992018: 2862019: 13620192020: 1322021: 3532022: 22320222023: 6152024: 1632025: 10720252026: 71

2026 covers reports received through June 2026 only.

Reactions recorded in the reports

share of Dulcolax reports recording the termmedian drug in osmotic laxative

  1. Constipationconstipation26.9%779
  2. Drug ineffectivethe medicine did not work as expected22.8%659
  3. Painpain, site not specified16.6%480
  4. Hypotensionlow blood pressure14.4%416
  5. Falla fall14.3%414
  6. Balance disorderproblems with balance13.5%390
  7. Cognitive disorderproblems with thinking or memory13.4%389
  8. Sedationdrowsiness from a medicine12.9%374
  9. Mobility decreasedreduced ability to move about12.4%359
  10. Creatinine renal clearance decreased12.3%357
  11. No adverse eventno adverse event was reported12.3%357
  12. Off label useused for a purpose or in a way not on the label12.1%351
  13. Sedation complication11.9%343
  14. Nauseafeeling sick11.7%339
  15. Abdominal painstomach or belly pain11.5%334
  16. Vomitingbeing sick11.5%333
  17. Toxicity to various agentspoisoning or toxic effect of one or more substances11.1%320
  18. Diarrhoealoose or frequent stools8.8%256
  19. Abdominal distensiona bloated abdomen8%231
  20. General physical health deteriorationgeneral decline in health6.7%193
  21. Hyponatraemialow blood sodium6.6%191
  22. Appendicolith6.2%180
  23. Ascitesfluid in the abdomen6.2%180
  24. Dyspnoeashortness of breath6.2%179
  25. Sepsisa severe body-wide response to infection6.2%178
  26. Cardiogenic shockshock from the heart failing to pump6.1%177

Top 30 of 532 MedDRA preferred terms recorded across these reports, with a plain-language gloss where one is available. One report can record several terms. The hollow bar is the median share across the 17 drugs in the osmotic laxative class; it describes the reports, not the patients. FDA states that adverse event reports "represent a small percentage of total usage numbers of a product", that "common products may have a higher number of adverse events due to the higher total number of people using the product", and that the data "by themselves are not an indicator of the safety profile of the drug or biologic."

Outcomes recorded

Death9.6%278
Life-threatening8.7%253
Hospitalisation (initial or prolonged)37%1,069
Disability6.5%188
Congenital anomaly2.6%75
Other serious51.8%1,498
Not serious36.2%1,046

Outcome flags as the reporter set them; a report can carry several, and "other serious" is FDA's own category for serious reports outside the named outcomes. Grey bar: all 129,514 reports in the class. FDA has not verified any outcome and states that the reports "cannot be used to estimate the incidence of these events."

Patients and reporters

Patient age

Under 20.1%2
2 to 111.7%50
12 to 170.4%12
18 to 444.4%127
45 to 647.7%223
65 to 747.3%211
75 and over29.5%854
Age not given48.9%1,414

Patient sex

Female56.9%1,646
Male33.5%968
Not given9.6%279

Who reported

Physician7.5%217
Pharmacist0.9%26
Other health professional23.9%691
Lawyer2.8%82
Consumer or non-health professional62.4%1,806
Not given2.5%71

Age and sex as stated in the report; the reporter's qualification is the primary source recorded by FDA. 60.4% of reports give the United States as the country of the event or reporter.

Reason for use recorded

Indication as recorded (MedDRA)ReportsShare
Constipation1,07737.2%
Colonoscopy1294.5%
Ventricular fibrillation301%
Bowel preparation240.8%
Bowel movement irregularity160.6%
Child abuse120.4%

The indication field is filled in by the reporter and is often blank; shares are of all 2,893 reports.

Drugs most often listed in the same reports

Drug (any role in the report)ReportsShare of Dulcolax reports
Acetaminophen67823.4%
Morphine sulfate47116.3%
Furosemide39713.7%
Albuterol37813.1%
Magnesium hydroxide37412.9%
Carbamazepine36612.7%
Lactulose35512.3%
Bisacodyl35112.1%
Nitroglycerin35012.1%
Acebutolol hydrochloride33411.5%

Other products listed in reports where Dulcolax is a suspect product, whatever their own role. Co-listing means the two were recorded together; it says nothing about either product's part in the event. Only the 2,500 most-reported names are counted here.

In context

MeasureDulcolaxOsmotic laxativeAll reports
Reports as suspect product2,893129,51420,646,523
Share of that pool—2.2%0%
Reports, latest 12 months137—1,332,454
Marked serious63.8%54.5%57.4%
Death recorded among outcomes, per 1,000 reports9615291
Hospitalisation recorded, per 1,000 reports370286213
Consumer-filed share62.4%61%45.8%
Top term, share of reportsConstipation 26.9%median 2%1%

Shares are of reports, not of patients treated. The number of people taking a product is not in the data, so none of these figures is a rate, and differences between columns reflect who takes a product, who reports and how long it has been sold. FDA states that adverse event reports "represent a small percentage of total usage numbers of a product", that "common products may have a higher number of adverse events due to the higher total number of people using the product", and that the data "by themselves are not an indicator of the safety profile of the drug or biologic."

Other drugs in the osmotic laxative class

DrugName typeReportsLatest 12 monthsMarked serious
MiraLAXbrand38,1881,7217.2%
Extranealbrand30,83073383.6%
Sodium chloridegeneric11,0441,38992.5%
Delflexbrand8,76567653.8%
Potassium chloridegeneric8,17251886.4%
DIANEAL PD-2 with Dextrosebrand7,17816188.6%
Polyethylene glycol 3350generic5,75072617.8%
Lactulosegeneric4,13335387.1%
SUPREP Bowel Prepbrand3,664359.1%
Sodium bicarbonategeneric3,34230892.1%
Sutabbrand1,51315112%
Bssbrand1,0474189.6%
DIANEAL Low Calcium with Dextrosebrand9702697.4%
Polyethylene glycolgeneric7605885.5%
Sodium bicarbonate, sodium chloridegeneric67529100%

Ordered by report count for navigation only. FDA states that adverse event reports "represent a small percentage of total usage numbers of a product", that "common products may have a higher number of adverse events due to the higher total number of people using the product", and that the data "by themselves are not an indicator of the safety profile of the drug or biologic." A brand and its generic are separate rows because reporters name them separately.

Questions about Dulcolax reports

How many adverse event reports has FDA received for Dulcolax?

2,893 reports list Dulcolax as a suspect or interacting product in the openFDA FAERS release of 28 Sep 2026, covering reports received through June 2026. 137 of them arrived in the latest 12 months. Another 8,741 list it only as a concomitant medication.

What reactions are recorded in Dulcolax reports?

constipation (26.9%), drug ineffective (22.8%), pain (16.6%), hypotension (14.4%) and fall (14.3%). These are MedDRA preferred terms coded from what the reporter described; a report can list several, and a term's presence is not a finding that Dulcolax was responsible.

How serious are the reports?

63.8% are marked serious by the reporter. Among the outcomes recorded, 9.6% of reports include death and 37% include hospitalisation. FDA has not verified these outcomes and states that the reports "cannot be used to estimate the incidence" of the events.

Who files these reports?

consumer or non-health professional (62.4%), other health professional (23.9%) and physician (7.5%). Most reports reach FDA through the manufacturer, which must forward reports it receives.

Are reports for Dulcolax rising?

137 reports in the 12 months to June 2026, up 59% from 86 in the 12 months before. FDA releases FAERS data quarterly, so the newest months are incomplete and grow in later releases. Counts also move with how many people take a product, its time on the market and publicity.

Do these reports show that Dulcolax was responsible for these reactions?

No. FDA states that "a causal relationship cannot be established between product and reactions listed in a report" and that for any given report "there is no certainty that a suspected drug caused the event." The reaction may relate to the condition being treated, to other medicines, or to something else.

Is this a list of the side effects of Dulcolax?

No. It is a count of what was reported to FDA. The adverse reactions observed in clinical studies are printed on the FDA-approved label, which a pharmacist or clinician can go through with you.

How do I report an adverse event?

Consumers and health professionals can report to FDA through MedWatch (Form FDA 3500 online, or 1-800-FDA-1088), or to the manufacturer, which must pass reports on. See the guide on how to report.

Where this comes from. Counts are built from the openFDA Drug Adverse Event (FAERS) bulk export released 28 Sep 2026, which holds reports FDA received through 30 Jun 2026. Drug names are as reported, resolved to the brand or generic name on the FDA label where openFDA's harmonisation matched them; classes are the pharmacologic class (EPC) from the label and the National Drug Code Directory of 17 Sep 2026. A report counts here when it lists Dulcolax as a suspect or interacting product; reports listing it only as a concomitant medication (8,741) are excluded. No report narrative, lot number, patient detail or reporter identity is published. See the methodology and sources; FDA's record is authoritative, and corrections are handled within five working days.

Drug data (FAERS) through 30 Jun 2026; device data (MAUDE) through 31 Aug 2026. Not medical advice.