Mebendazole is contraindicated in pregnant women because it has been shown to be embryotoxic and teratogenic in experimental animals. 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. MZ induced a dose- and time-dependent apoptotic response in human lung cancer cell lines, and apoptosis via Bcl-2 inactivation in chemoresistant melanoma cells. 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.