Mebendazole Tablet

Mebendazole is used against several common intestinal helminths.

• Pinworm (threadworm): infection caused by Enterobius vermicularis.

• Roundworm: including Ascaris lumbricoides.

• Whipworm: including Trichuris trichiura.

• Hookworm: including Ancylostoma duodenale and Necator americanus.

• Mixed intestinal infections: treatment may be selected when more than one susceptible worm is identified.

The exact approved indications vary by product and country. Mebendazole should not be assumed to treat every parasitic infection, particularly parasites that require different medicines or specialist treatment.

Mebendazole dosing depends on the parasite, formulation, age and treatment indication.

For the U.S.-approved 100 mg EMVERM formulation, the labeled regimen is one 100 mg tablet once for pinworm, while whipworm, roundworm and hookworm infections are treated with one 100 mg tablet morning and evening for 3 consecutive days. The tablet may be chewed, swallowed or crushed and mixed with food. (dailymed.nlm.nih.gov)

A separate U.S. 500 mg chewable formulation has a different labeled regimen, illustrating why tablet strength cannot be used to determine an individual dose. (dailymed.nlm.nih.gov)

Use the exact strength and schedule supplied by the prescriber or product labeling.

Mebendazole belongs to the benzimidazole anthelmintic class.

Mechanism	Result
Interferes with parasite tubulin	Disrupts essential cellular structures
Impairs glucose utilization	Reduces the worm's available energy
Affects essential parasite functions	Leads to immobilization and death of susceptible worms

Because different parasites have different biology and drug susceptibility, a correct diagnosis remains important. Mebendazole should not be presented as a universal treatment for all worms or other types of parasites.

Follow the instructions for the exact product and infection being treated.

• Take the prescribed dose at the recommended time and for the specified duration.

• Depending on the formulation, the tablet may be chewed, swallowed or crushed; follow its individual leaflet.

• Mebendazole can generally be taken without special fasting or purging requirements.

• Do not automatically repeat a dose because symptoms continue.

• If treatment is prescribed as a multi-day course, do not stop early without professional advice.

For pinworm, hygiene measures such as frequent handwashing, keeping fingernails short and cleaning potentially contaminated household surfaces can help reduce reinfection. NHS guidance also notes that household treatment may be recommended for eligible household members depending on circumstances. (nhs.uk)

Common adverse effects can include:

• Abdominal pain or discomfort

• Diarrhoea

• Flatulence

• Nausea or vomiting

• Reduced appetite

• Rash

These effects are generally reported with mebendazole treatment, although not everyone experiences them. (dailymed.nlm.nih.gov)

Important interaction considerations include metronidazole and cimetidine. U.S. prescribing information specifically warns against concomitant mebendazole and metronidazole because serious skin reactions, including Stevens-Johnson syndrome/toxic epidermal necrolysis, have been reported. (dailymed.nlm.nih.gov)

Do not use mebendazole if you have a known hypersensitivity to mebendazole or any relevant component of the formulation. Although short courses are generally well tolerated, higher doses or prolonged treatment have been associated with neutropenia and agranulocytosis, so blood-count monitoring may be appropriate when treatment is intensive or prolonged. Liver problems have also been reported. (dailymed.nlm.nih.gov)

Mebendazole and metronidazole should not be taken together unless specifically directed by a qualified healthcare professional because serious skin reactions have been reported. Seek urgent care for blistering or peeling skin, mouth or eye sores, facial swelling or breathing difficulty.

Children require age-appropriate medical advice. NHS guidance permits routine use in children aged 2 years and older for certain infections, while younger children require professional assessment. Pregnancy and breastfeeding should also be discussed with a doctor or pharmacist before treatment. (nhs.uk)

Seek medical attention for seizures, severe allergic reactions, jaundice, unusual bruising or persistent symptoms.

This information is for general education and does not replace advice from a doctor, pharmacist or qualified healthcare professional.