Prescription medication · Antiparasitic (Benzimidazole)
mebendazole
Also sold as Emverm. Emverm treats infections in your stomach and intestines caused by roundworm and whipworm.
Data updated 2026-05-15
- 762
- FDA reportsRarely reported
- 2
- InteractionsFew interactions
- $650.38
- Generic price (NADAC)
What the data shows
mebendazole (Emverm) is a prescription Antiparasitic (Benzimidazole), among the least-reported drugs the FDA tracks (762 FDA reports), with 2 documented drug interactions.
Reporting volume reflects how widely a drug is used and studied, not how dangerous it is, a FAERS report documents a temporal association, never proof of cause.
mebendazole (Emverm) is a prescription Antiparasitic (Benzimidazole). Emverm treats infections in your stomach and intestines caused by roundworm and whipworm.
Emverm is a medicine used to treat worm infections in your gut. It kills the worms so your body can get rid of them.
Verify with FDA → · CMS NADAC pricing →
Drug Pricing (NADAC)
Generic Price
$650.38/unit
Generic Available
Yes (0 manufacturers)
Pricing data from NADAC (CMS), effective December 18, 2024. Compare all drug costs →
What it does
Emverm treats infections in your stomach and intestines caused by roundworm and whipworm.
Common side effects
Loss of appetite, Stomach pain, Diarrhea
Key warnings
In rare cases, infants under 1 year old have had seizures while taking this medicine.
The sections below are summarized in plain English from mebendazole's FDA-approved prescribing information. They describe what the official label says, and are not personal medical advice.
How It Works
Emverm stops the worms from using sugar. Without sugar, the worms die. Then your body can get rid of the dead worms.
Side Effects (from patient reports)
Based on 762 FDA adverse event reports.
Most-reported reactions
Adverse reactions in FAERS for mebendazole, by number of reports
- Foetal Exposure During Pregnancy
Foetal Exposure During Pregnancy
56 reports
- Nausea
Nausea
48 reports
- Vomiting
Vomiting
43 reports
- Abdominal Pain
Abdominal Pain
41 reports
- Dizziness
Dizziness
36 reports
- Fatigue
Fatigue
32 reports
- Drug Exposure During Pregnancy
Drug Exposure During Pregnancy
30 reports
- Asthenia
Asthenia
29 reports
- Diarrhoea
Diarrhoea
29 reports
- Pyrexia
Pyrexia
29 reports
What this shows Bars show how often each reaction was reported, not how likely it is to happen, a report records a temporal association, never proof that the drug caused it.
Reports over time
Adverse-event reports filed for mebendazole each year to the FDA Adverse Event Reporting System (FAERS).
Year-to-year volume tracks usage, prescribing, and scrutiny, not a change in per-patient risk. Source: FDA FAERS.
Where mebendazole sits
mebendazole has more FDA adverse-event reports than 5% of the drugs FAERS tracks. A high position reflects how widely a drug is used and watched, not how dangerous it is.
Percentile across all drugs PlainMeds tracks by FAERS report volume. The dot is mebendazole; the line is the median (50th percentile).
FDA Adverse Event Report Analysis
Detailed analysis of 762 reports from the FDA Adverse Event Reporting System (FAERS). Reports span 2004–2025.
Total Reports
762
Reports Mentioning Death
54
7.1% of reports — not proof of cause
Hospitalization Reports
181
Top Indication
Product Used For Unknown Indication
Gender Distribution
Age Distribution
Most Reported Adverse Reactions (FAERS)
| # | Reaction | Reports |
|---|---|---|
| 1 | FOETAL EXPOSURE DURING PREGNANCY | 56 |
| 2 | NAUSEA | 48 |
| 3 | VOMITING | 43 |
| 5 | ABDOMINAL PAIN | 41 |
| 7 | DIZZINESS | 36 |
| 8 | FATIGUE | 32 |
| 9 | DRUG EXPOSURE DURING PREGNANCY | 30 |
| 10 | ASTHENIA | 29 |
| 11 | DIARRHOEA | 29 |
| 12 | PYREXIA | 29 |
| 13 | HEADACHE | 28 |
| 14 | PRURITUS | 24 |
| 15 | EXPOSURE DURING PREGNANCY | 22 |
| 16 | ABORTION SPONTANEOUS | 21 |
| 17 | MALAISE | 21 |
Reactions in Death Reports
Reactions in Hospitalization Reports
Source: FDA FAERS (Adverse Event Reporting System) Reports are voluntary and do not establish causation
Serious Warnings
In rare cases, infants under 1 year old have had seizures while taking this medicine. If you take high doses of this medicine for a long time, it can lower your blood cell counts. If you take metronidazole with this medicine, you could get a severe skin reaction. Do not take Emverm if you are allergic to any of its ingredients.
Known Drug Interactions
albuterol, systemic and inhaled mebendazole amoxicillin medroxyprogesterone ampicillin, with or without sulbactam methylprednisolone atenolol metronidazole azithromycin metoprolol caffeine, dietary ingestion nadolol cefaclor nifedipine co-trimoxazole (trimethoprim and sulfamethoxazole) nizatidine diltiazem norfloxacin dirithromycin ofloxacin enflurane omeprazole famotidine prednisone, prednisolone felodipine ranitidine finasteride rifabutin hydrocortisone roxithromycin isoflurane Sorbitol (purgative doses do not inhibit theophylline absorption) isoniazid sucralfate isradipine terbutaline,...
Mechanism: This medicine does not interfere with the body's ability to process and remove theophylline from your system.
7 DRUG INTERACTIONS Concomitant use of mebendazole and metronidazole should be avoided [see Warnings and Precautions (5.3) ] .
Mechanism: Using these two drugs together is linked to a higher risk of serious health problems.
This is a plain-language summary of FDA-label interaction records and does not provide individual medication-combination directions.
Common Questions
Can I give this medicine to my baby?
What if I can't chew the tablet?
How long does it take for the medicine to work?
Can I take this medicine with other medicines?
What should I do if I get a rash?
How do I know if the medicine is working?
Can I drink alcohol while taking this medicine?
What if I accidentally swallow the tablet whole?
Can I get worms again after taking this medicine?
Is there a generic version of this medicine?
What are the common side effects of mebendazole?
Does mebendazole interact with other medications?
What drug class is mebendazole?
What pregnancy or breastfeeding source fields are listed for mebendazole?
Related Medications in Antiparasitic (Benzimidazole)
Other drugs grouped near mebendazole - same-class peers and common alternatives.
acyclovir
Zovirax
Acyclovir is an antiviral medicine.
Compare with mebendazole →
albendazole
Albenza
Albendazole is a medicine that fights parasites.
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amphotericin B
Ambisome, Fungizone
Amphotericin B liposome is an antifungal medicine.
Compare with mebendazole →
anidulafungin
Eraxis
Eraxis is an antifungal medicine.
Compare with mebendazole →
atovaquone/proguanil
Malarone
Malarone is a drug used to prevent and treat malaria.
Compare with mebendazole →
Compare beyond drug class
Nationwide peers by FAERS volume & death-report share
Two PlainMeds-derived comparison paths for mebendazole: nearest FDA FAERS report volume and nearest death-report share among drugs with at least 1,000 logged reports, excluding same-class neighbors listed above. Counts reflect reporting volume, not proven individual harm.
Similar FAERS report volume
Nearest drugs by total FAERS reports. This record: 762.
Similar death-report share
Nearest drugs by FAERS death-report share. This record: 7.09%.
- umeclidinium Δ 0.01 pts · 8,530 reports · Long-Acting Muscarinic Antagonist (LAMA) 7.09%death share
- tolterodine Δ 0.01 pts · 6,323 reports · Anticholinergic (Overactive Bladder) 7.10%death share
- penicillin V Δ 0.04 pts · 2,398 reports · Natural Penicillin 7.13%death share
- brodalumab Δ 0.05 pts · 1,890 reports · Anti-IL-17 Receptor Monoclonal Antibody 7.04%death share
Medication Guides
Understanding Drug Interactions
How CYP450 enzymes, inhibitors, and inducers affect your medications
Generic vs Brand Name Drugs
FDA requirements, cost savings, and when the difference matters
Narrow Therapeutic Index Drugs
FDA bioequivalence and label-record context for narrow therapeutic index medicines
Common Drug Interactions
Dangerous medication combinations and how to protect yourself
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What the FDA Data Shows for mebendazole
The FDA label for mebendazole (sold under brand names such as Emverm) classifies it as a prescription-only medication in the Antiparasitic (Benzimidazole) class. Emverm treats infections in your stomach and intestines caused by roundworm and whipworm. Official labeling lists 7 commonly reported side effects, including Loss of appetite, Stomach pain, Diarrhea.
Post-market surveillance from the FDA Adverse Event Reporting System (FAERS) captures real-world experience. For this drug, FAERS contains 762 voluntary reports. The database also lists 2 documented drug interactions derived from FDA labeling, with the top-flagged interaction rated major severity. NADAC pricing from CMS shows a generic unit cost of $650.38.
Report counts do not establish causation, a FAERS entry documents a temporal association, not proof that the drug produced the outcome. Widely prescribed medications naturally accumulate more reports than niche therapies, so raw totals must be interpreted alongside total exposure. Shortage status, recall history, and patent information are separate source-record fields. This page is a public FDA/CMS registry and does not provide medical, treatment, substitution, or medication-change directions.
Data Sources
Drug labeling: FDA Drug Labels (SPL/DailyMed). Adverse events: FDA Adverse Event Reporting System (FAERS). Pricing: CMS National Average Drug Acquisition Cost (NADAC).
FAERS reports are voluntary and do not establish causation. Drug interactions are derived from FDA labeling and clinical references. This registry does not provide medication decisions.
Last updated: October 5, 2021
PlainMeds is rendered directly from FDA openFDA/FAERS extracts, DailyMed labels, and CMS drug-pricing files, no number is typed in by an editor. FAERS counts, recalls, shortages, and price figures on this page are queried live from those federal extracts. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of 2026-05-15. Primary sources: openFDA / FAERS, DailyMed and CMS Part B ASP.
Read our methodology - how this data is sourced, computed, and verified.
Data currency: FDA FAERS adverse-event reports through 2025, CMS NADAC acquisition-cost pricing effective December 2024, compiled from the source snapshot dated . See our methodology for per-source dates and refresh cadence. Spot a figure that looks wrong? Report a data issue.
All federal data sources used on this page
- FDA Orange Book - approved drug products with therapeutic equivalence. accessdata.fda.gov/cder/ob
- FDA DailyMed - NIH-hosted drug labeling for FDA-approved meds. dailymed.nlm.nih.gov
- FDA Adverse Event Reporting System (FAERS) - post-marketing safety surveillance. fda.gov/drugs/faers
- NLM RxNorm - standardized clinical drug nomenclature. nlm.nih.gov/research/umls/rxnorm
- CMS Medicare Part B Drug Average Sales Price Files - federal drug pricing data. cms.gov/medicare/part-b-drugs/asp
- FDA Drug Shortages Database - current and resolved drug shortage tracking. accessdata.fda.gov/drugshortages