|Systematic (IUPAC) name|
|Trade names||Generic (formerly Vermox)|
|Pregnancy cat.||B3 (AU) C (US)|
|Legal status||Pharmacy Only (S2) (AU) OTC (CA) GSL (UK) OTC (US)|
|Excretion||Faeces, urine (5-10%)|
|ATC code||P02 QP52|
|Mol. mass||295.293 g/mol|
|Melt. point||288.5 °C (551 °F)|
|(what is this?)|
Mebendazole or MBZ is a benzimidazole drug developed by Janssen Pharmaceutica and marketed in the USA as a generic drug only, according to the FDA Orange Book. It is used to treat infestations by worms including pinworms, roundworms, tapeworms, hookworms, and whipworms.
Mebendazole is a WHO Essential Medicine.
The drug is a highly effective, broad-spectrum antihelmintic indicated for the treatment of nematode infestations, including roundworm, whipworm, threadworm, and hookworm. It is poorly absorbed and has no systemic effects.
Mebendazole is thought to work by selectively inhibiting the synthesis of microtubules in parasitic worms, and by destroying extant cytoplasmic microtubes in their intestinal cells, thereby blocking the uptake of glucose and other nutrients, resulting in the gradual immobilization and eventual death of the helminths.
Oral dosage for treatment of pinworms is 100 mg taken once. (500 mg can also be taken instead) This regimen is repeated two weeks later if the infestation has not cleared up. Oral dosage for treatment of whipworm, common roundworm and hookworm is one 100-mg tablet in the morning for three consecutive days in children below 5yrs of age and below 18 kg weight. In adults it is 100 mg twice a day. 
Mebendazole is relatively free of toxic side effects or adverse reactions, although patients may complain of transient abdominal pain, heart pain, diarrhea, slight headache, fever, dizziness, exanthema, urticaria, and angioedema.
Carbamazepine and phenytoin lower serum levels of mebendazole. Cimetidine does not appreciably raise serum mebendazole (in contrast to the similar drug albendazole), consistent with its poor systemic absorption.
Oncologic treatment potential
Several studies show mebendazole exhibits potent antitumor properties. MBZ significantly inhibited cancer cell growth, migration and metastatic formation of adrenocortical carcinoma, both in vitro and in vivo. Treatment of lung cancer cell lines with MBZ caused mitotic arrest, followed by apoptotic cell death with the feature of caspase activation and cytochrome c release. MBZ induced a dose- and time-dependent apoptotic response in human lung cancer cell lines, and apoptosis via Bcl-2 inactivation in chemoresistant melanoma cells.
Discontinuation in United States
The last manufacturer of mebendazole in the United States, Teva Pharmaceuticals, announced on October 7, 2011, they have ceased manufacture of this product. As of December, 2011, it is no longer available from any manufacturer in the USA. No reason was given publicly for this discontinuation. Mebendazole formulations can be made by a compounding pharmacy at the request of a doctor.
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- Doudican N, Rodriguez A, Osman I, Orlow SJ (August 2008). "Mebendazole induces apoptosis via Bcl-2 inactivation in chemoresistant melanoma cells". Mol. Cancer Res. 6 (8): 1308–15. doi:10.1158/1541-7786.MCR-07-2159. PMID 18667591.
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