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Mebendazole Side Effects

The most commonly reported side effects of mebendazole include foetal exposure during pregnancy, off label use, and vomiting, based on 876 FDA adverse event reports from 2004 to 2025. 7.4% of reports found the drug to be ineffective.

Mebendazole side effects

Percentages show how often each reaction appears relative to total reports for mebendazole.

1
Drug Ineffective7.4%65
2
Foetal Exposure During Pregnancy6.5%57
3
Off Label Use4.3%38
4
Vomiting4.0%35
5
Nausea3.9%34
6
Fatigue3.9%34
7
Diarrhoea3.5%31
8
Abdominal Pain3.5%31
9
Drug Exposure During Pregnancy3.3%29
10
Headache2.9%25
11
Dizziness2.7%24
12
Exposure During Pregnancy2.5%22
13
Asthenia2.4%21
14
Malaise2.4%21
15
Intentional Self-injury2.3%20

These are voluntary reports and do not establish that mebendazole caused these reactions.

Report severity

82.5%Serious723 reports
21.8%Hospitalizations191 reports
6.8%Fatal60 reports

Seriousness is determined by the reporter, not by OpenClaim.

Mebendazole drug interactions

Other drugs that appear in adverse event reports alongside mebendazole. Drugs flagged as a suspected cause appear in the first column. Drugs taken at the same time but not suspected appear in the second.

Also suspected

1
Acetaminophen2.9%25
2
Lamivudine2.6%23
3
Diclofenac2.6%23
4
Albendazole2.5%22
5
Tenofovir2.5%22
6
Amoxicillin2.2%19
7
Sertraline-hydrochloride2.2%19
8
Fluconazole2.1%18
9
Metronidazole2.1%18
10
Ibuprofen1.8%16
11
Omeprazole1.8%16
12
Levofloxacin1.8%16
13
Zidovudine1.7%15
14
Olanzapine1.6%14
15
Efavirenz1.4%12

Taken alongside

1
Acetaminophen7.8%68
2
Metformin5.9%52
3
Atorvastatin-calcium5.0%44
4
Levothyroxine-sodium4.3%38
5
Ibuprofen4.1%36
6
Ergocalciferol4.1%36
7
Aspirin3.9%34
8
Amoxicillin3.7%32
9
Doxycycline3.2%28
10
Omeprazole3.2%28
11
Celecoxib3.0%26
12
Furosemide2.6%23
13
Prednisone2.6%23
14
Folic-acid2.4%21
15
Hydrocortisone2.3%20

Co-occurrence in adverse event reports does not establish a drug interaction. Patients often take multiple medications, and these lists reflect prescribing patterns rather than causal relationships. Consult a healthcare provider about potential drug interactions.

Who reports mebendazole side effects

53.9% of mebendazole adverse event reports involve female patients and 32.6% involve male patients. The largest age group is adult at 52%. These figures reflect who reports side effects, not underlying risk.

Sex

Female53.9%
Male32.6%
Unknown13.5%

Age group

< 27.0%
2–1125.1%
12–175.3%
18–6451.8%
65+10.8%

What is mebendazole used for

Conditions and purposes for which patients were taking mebendazole when the adverse event was reported.

Abdominal PainAcanthamoeba InfectionAccidental Exposure To ProductAccidental Exposure To Product By ChildAdrenal Gland CancerAnti-infective TherapyAntiemetic Supportive CareArrhythmiaAscariasisAdverse Drug ReactionAscariasisBacterial InfectionBlastocystis InfectionCestode InfectionColon Cancer

Showing 15 of 92 indications

Mebendazole brand names and reporting trend

Mebendazole is sold under the brand name Emverm.

Brand names

Emverm411

Quarterly reports (20042025)

20052010201520202025

An upward trend reflects increased FAERS reporting overall, not necessarily increased risk.

Taking mebendazole with another medication?

Ask OpenClaim about your specific drug combination. Get a sourced report using FDA data, drug labels, and medical literature.