Mebendazole: uses, side effects & brands

Written & medically reviewed by Dr. Sanjay Anbu, MBBS · Last reviewed 5 November 2026

Mebendazole treats threadworm, roundworm and other intestinal worms. It belongs to the Antiparasitic / anthelmintic group. These treat worm infestations and parasitic infections.

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Drug type — dosing is set by your doctor

Measure	Range
Drug class	Antiparasitic / anthelmintic
Type	Prescription
Dose	Individual — ask your doctor or pharmacist

What it is used for

Threadworm (pinworm)
Roundworm, hookworm and whipworm
Mixed intestinal worm infections

Common brand names

India: Mebex, Wormin
Worldwide: Vermox, Emverm

Common side effects

Stomach pain
Diarrhoea
Nausea
Mild rash (uncommon)

Before taking it — precautions

Avoid in pregnancy, especially the first trimester, unless advised
Treat the household and wash hands, nails and bedding to prevent reinfection
Tell your doctor about liver disease

When to see a doctor urgently

Swelling of face, lips or throat (urgent)
Severe rash or blistering skin (urgent)
Fever with sore throat

Not a prescription — no dose shown. The right dose of mebendazole depends on age, weight, kidney/liver function and the condition, so MedDroid does not show a dose here. Always get your dose from a doctor or pharmacist and the leaflet inside the pack. General educational information only.

Frequently asked questions

Do I need a second dose for threadworm?

A repeat dose is often advised after a couple of weeks to catch newly hatched worms; follow your doctor or pharmacist.

How do I stop threadworm coming back?

Wash hands and scrub nails, keep nails short, change underwear daily and wash bedding.

Is mebendazole safe for children?

It is commonly used in children above a certain age; check with your doctor for young children.

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Sources & further reading

Reviewed by Dr. Sanjay Anbu, MBBS. MedDroid is an AI medical assistant and can make mistakes. It provides general health information, not a diagnosis or medical advice — always consult a qualified clinician. In an emergency, contact your local emergency number immediately.