What Is Mebendazole? Uses, Dosage, and What You Need to Know in 2026

Mebendazole is an antiparasitic medication that has been used for more than 50 years to treat intestinal worm infections. If you or someone in your household has just been diagnosed with pinworm, roundworm, hookworm, or whipworm — or if your doctor has prescribed Emverm — this guide will give you a clear, complete picture of the medication.

What Is Mebendazole?

Mebendazole is a benzimidazole anthelmintic — a class of drugs that fight parasitic worm (helminth) infections. It was developed in 1971 by Janssen Pharmaceutica in Belgium and received FDA approval in the United States in 1974. Today, it is on the World Health Organization's List of Essential Medicines, reflecting its importance to global health.

In the United States, mebendazole is available under the brand name Emverm, manufactured by Amneal Pharmaceuticals. It comes as a 100 mg chewable tablet that can be swallowed whole, chewed, or crushed and mixed with food. There is currently no FDA-approved generic mebendazole on the US market.

What Is Mebendazole Used For?

Mebendazole (Emverm) is FDA-approved to treat four types of intestinal parasitic worm infections in patients 2 years of age and older:

• Pinworm (Enterobius vermicularis): The most common intestinal worm infection in the US, especially in school-age children. Characterized by intense itching around the anus at night.
• Roundworm (Ascaris lumbricoides): Affects over 1 billion people worldwide; transmitted through contaminated soil, food, or water.
• Hookworm (Ancylostoma duodenale and Necator americanus): Can cause anemia by feeding on intestinal blood; contracted through skin contact with contaminated soil.
• Whipworm (Trichuris trichiura): Can cause diarrhea and anemia; common in tropical and subtropical regions.

Mebendazole also has several off-label uses, including capillariasis, toxocariasis, trichinellosis (Trichinella spiralis infection), and cystic echinococcosis (hydatid disease). However, albendazole is generally preferred for tissue-invasive infections because it is better absorbed systemically.

Mebendazole Dosage: How Much to Take

The dosage of mebendazole depends on the type of worm infection being treated. The same dose applies to both adults and children aged 2 years and older:

• Pinworm (enterobiasis): 100 mg as a single dose. A second dose is recommended after 3 weeks if the infection persists or to prevent reinfection from newly hatched eggs.
• Roundworm, hookworm, and whipworm: 100 mg twice daily (morning and evening) for 3 consecutive days. If not cured after 3 weeks, a second course may be needed.

The tablet can be chewed, swallowed whole, or crushed and mixed with food. No fasting, purging, or special diet is required before or during treatment. You may take it with or without food, though fatty meals may help with absorption for higher-dose off-label treatments.

How Well Does Mebendazole Work?

Clinical trials have demonstrated that mebendazole is highly effective for the worm infections it is approved to treat. Mean cure rates from clinical studies include:

• Pinworm: ~95% cure rate
• Roundworm: ~98% cure rate
• Hookworm: ~96% cure rate
• Whipworm: ~68% cure rate (lower efficacy; may require extended therapy)

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Is Mebendazole a Controlled Substance?

No. Mebendazole is not a controlled substance and is not scheduled by the DEA. Any licensed prescriber can write a prescription, and it can be prescribed via telehealth without restrictions. However, it does require a valid prescription in the United States — it is not available over the counter.

Key Things to Know Before Taking Mebendazole

• Tell your doctor if you are taking metronidazole (Flagyl) — this combination can cause a serious skin reaction
• Tell your doctor if you take anticonvulsants like phenytoin or carbamazepine — these can reduce how well mebendazole works
• For pinworm, all household members should be treated at the same time to prevent reinfection
• Practice good hygiene (handwashing, laundering bedding) on the day of treatment to reduce reinfection risk

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Having Trouble Filling Your Prescription?

Emverm can be difficult to find at local pharmacies and has a very high retail price. medfinder helps you locate pharmacies near you that have it in stock. And make sure to check out the Emverm Savings Program — eligible commercially insured patients can pay as little as $5 per fill.